// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Generated by the Codegen C++ plugin.
// If you make any local changes, they will be lost.
// source: google/cloud/backupdr/v1/backupdr.proto

#ifndef GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_BACKUPDR_V1_BACKUP_DR_CLIENT_H
#define GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_BACKUPDR_V1_BACKUP_DR_CLIENT_H

#include "google/cloud/backupdr/v1/backup_dr_connection.h"
#include "google/cloud/future.h"
#include "google/cloud/no_await_tag.h"
#include "google/cloud/options.h"
#include "google/cloud/polling_policy.h"
#include "google/cloud/status_or.h"
#include "google/cloud/version.h"
#include <google/longrunning/operations.grpc.pb.h>
#include <map>
#include <memory>
#include <string>

namespace google {
namespace cloud {
namespace backupdr_v1 {
GOOGLE_CLOUD_CPP_INLINE_NAMESPACE_BEGIN

///
/// The BackupDR Service
///
/// @par Equality
///
/// Instances of this class created via copy-construction or copy-assignment
/// always compare equal. Instances created with equal
/// `std::shared_ptr<*Connection>` objects compare equal. Objects that compare
/// equal share the same underlying resources.
///
/// @par Performance
///
/// Creating a new instance of this class is a relatively expensive operation,
/// new objects establish new connections to the service. In contrast,
/// copy-construction, move-construction, and the corresponding assignment
/// operations are relatively efficient as the copies share all underlying
/// resources.
///
/// @par Thread Safety
///
/// Concurrent access to different instances of this class, even if they compare
/// equal, is guaranteed to work. Two or more threads operating on the same
/// instance of this class is not guaranteed to work. Since copy-construction
/// and move-construction is a relatively efficient operation, consider using
/// such a copy when using this class from multiple threads.
///
class BackupDRClient {
 public:
  explicit BackupDRClient(std::shared_ptr<BackupDRConnection> connection,
                          Options opts = {});
  ~BackupDRClient();

  ///@{
  /// @name Copy and move support
  BackupDRClient(BackupDRClient const&) = default;
  BackupDRClient& operator=(BackupDRClient const&) = default;
  BackupDRClient(BackupDRClient&&) = default;
  BackupDRClient& operator=(BackupDRClient&&) = default;
  ///@}

  ///@{
  /// @name Equality
  friend bool operator==(BackupDRClient const& a, BackupDRClient const& b) {
    return a.connection_ == b.connection_;
  }
  friend bool operator!=(BackupDRClient const& a, BackupDRClient const& b) {
    return !(a == b);
  }
  ///@}

  // clang-format off
  ///
  /// Lists ManagementServers in a given project and location.
  ///
  /// @param parent  Required. The project and location for which to retrieve management servers
  ///  information, in the format 'projects/{project_id}/locations/{location}'. In
  ///  Cloud BackupDR, locations map to Google Cloud regions, for example
  ///  **us-central1**. To retrieve management servers for all locations, use "-"
  ///  for the
  ///  '{location}' value.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.ManagementServer], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.ListManagementServersRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L636}
  /// [google.cloud.backupdr.v1.ManagementServer]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L516}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::ManagementServer>
  ListManagementServers(std::string const& parent, Options opts = {});

  // clang-format off
  ///
  /// Lists ManagementServers in a given project and location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.ListManagementServersRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.ManagementServer], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.ListManagementServersRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L636}
  /// [google.cloud.backupdr.v1.ManagementServer]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L516}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::ManagementServer>
  ListManagementServers(
      google::cloud::backupdr::v1::ListManagementServersRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// Gets details of a single ManagementServer.
  ///
  /// @param name  Required. Name of the management server resource name, in the format
  ///  'projects/{project_id}/locations/{location}/managementServers/{resource_name}'
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.ManagementServer])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.GetManagementServerRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L684}
  /// [google.cloud.backupdr.v1.ManagementServer]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L516}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::ManagementServer> GetManagementServer(
      std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Gets details of a single ManagementServer.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.GetManagementServerRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.ManagementServer])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.GetManagementServerRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L684}
  /// [google.cloud.backupdr.v1.ManagementServer]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L516}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::ManagementServer> GetManagementServer(
      google::cloud::backupdr::v1::GetManagementServerRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Creates a new ManagementServer in a given project and location.
  ///
  /// @param parent  Required. The management server project and location in the format
  ///  'projects/{project_id}/locations/{location}'. In Cloud Backup and DR
  ///  locations map to Google Cloud regions, for example **us-central1**.
  /// @param management_server  Required. A [management server
  ///  resource][google.cloud.backupdr.v1.ManagementServer]
  /// @param management_server_id  Required. The name of the management server to create. The name must be
  ///  unique for the specified project and location.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.ManagementServer] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.CreateManagementServerRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L696}
  /// [google.cloud.backupdr.v1.ManagementServer]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L516}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::ManagementServer>>
  CreateManagementServer(
      std::string const& parent,
      google::cloud::backupdr::v1::ManagementServer const& management_server,
      std::string const& management_server_id, Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateManagementServer
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> CreateManagementServer(
      NoAwaitTag, std::string const& parent,
      google::cloud::backupdr::v1::ManagementServer const& management_server,
      std::string const& management_server_id, Options opts = {});

  // clang-format off
  ///
  /// Creates a new ManagementServer in a given project and location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.CreateManagementServerRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.ManagementServer] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.CreateManagementServerRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L696}
  /// [google.cloud.backupdr.v1.ManagementServer]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L516}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::ManagementServer>>
  CreateManagementServer(
      google::cloud::backupdr::v1::CreateManagementServerRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateManagementServer
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> CreateManagementServer(
      NoAwaitTag,
      google::cloud::backupdr::v1::CreateManagementServerRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateManagementServer
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::ManagementServer>>
  CreateManagementServer(google::longrunning::Operation const& operation,
                         Options opts = {});

  // clang-format off
  ///
  /// Deletes a single ManagementServer.
  ///
  /// @param name  Required. Name of the resource
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.OperationMetadata] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DeleteManagementServerRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L733}
  /// [google.cloud.backupdr.v1.OperationMetadata]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L811}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteManagementServer(std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteManagementServer
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> DeleteManagementServer(
      NoAwaitTag, std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Deletes a single ManagementServer.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.DeleteManagementServerRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.OperationMetadata] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DeleteManagementServerRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L733}
  /// [google.cloud.backupdr.v1.OperationMetadata]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L811}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteManagementServer(
      google::cloud::backupdr::v1::DeleteManagementServerRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteManagementServer
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> DeleteManagementServer(
      NoAwaitTag,
      google::cloud::backupdr::v1::DeleteManagementServerRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteManagementServer
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteManagementServer(google::longrunning::Operation const& operation,
                         Options opts = {});

  // clang-format off
  ///
  /// Creates a new BackupVault in a given project and location.
  ///
  /// @param parent  Required. Value for parent.
  /// @param backup_vault  Required. The resource being created
  /// @param backup_vault_id  Required. ID of the requesting object
  ///  If auto-generating ID server-side, remove this field and
  ///  backup_vault_id from the method_signature of Create RPC
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupVault] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupVault]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L48}
  /// [google.cloud.backupdr.v1.CreateBackupVaultRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L719}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupVault>> CreateBackupVault(
      std::string const& parent,
      google::cloud::backupdr::v1::BackupVault const& backup_vault,
      std::string const& backup_vault_id, Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateBackupVault
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> CreateBackupVault(
      NoAwaitTag, std::string const& parent,
      google::cloud::backupdr::v1::BackupVault const& backup_vault,
      std::string const& backup_vault_id, Options opts = {});

  // clang-format off
  ///
  /// Creates a new BackupVault in a given project and location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.CreateBackupVaultRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupVault] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupVault]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L48}
  /// [google.cloud.backupdr.v1.CreateBackupVaultRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L719}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupVault>> CreateBackupVault(
      google::cloud::backupdr::v1::CreateBackupVaultRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateBackupVault
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> CreateBackupVault(
      NoAwaitTag,
      google::cloud::backupdr::v1::CreateBackupVaultRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateBackupVault
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupVault>> CreateBackupVault(
      google::longrunning::Operation const& operation, Options opts = {});

  // clang-format off
  ///
  /// Lists BackupVaults in a given project and location.
  ///
  /// @param parent  Required. The project and location for which to retrieve backupvault stores
  ///  information, in the format 'projects/{project_id}/locations/{location}'. In
  ///  Cloud Backup and DR, locations map to Google Cloud regions, for example
  ///  **us-central1**.
  ///  To retrieve backupvault stores for all locations, use "-" for the
  ///  '{location}' value.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupVault], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupVault]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L48}
  /// [google.cloud.backupdr.v1.ListBackupVaultsRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L760}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupVault> ListBackupVaults(
      std::string const& parent, Options opts = {});

  // clang-format off
  ///
  /// Lists BackupVaults in a given project and location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.ListBackupVaultsRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupVault], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupVault]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L48}
  /// [google.cloud.backupdr.v1.ListBackupVaultsRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L760}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupVault> ListBackupVaults(
      google::cloud::backupdr::v1::ListBackupVaultsRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// FetchUsableBackupVaults lists usable BackupVaults in a given project and
  /// location. Usable BackupVault are the ones that user has
  /// backupdr.backupVaults.get permission.
  ///
  /// @param parent  Required. The project and location for which to retrieve backupvault stores
  ///  information, in the format 'projects/{project_id}/locations/{location}'. In
  ///  Cloud Backup and DR, locations map to Google Cloud regions, for example
  ///  **us-central1**.
  ///  To retrieve backupvault stores for all locations, use "-" for the
  ///  '{location}' value.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupVault], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupVault]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L48}
  /// [google.cloud.backupdr.v1.FetchUsableBackupVaultsRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L812}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupVault> FetchUsableBackupVaults(
      std::string const& parent, Options opts = {});

  // clang-format off
  ///
  /// FetchUsableBackupVaults lists usable BackupVaults in a given project and
  /// location. Usable BackupVault are the ones that user has
  /// backupdr.backupVaults.get permission.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.FetchUsableBackupVaultsRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupVault], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupVault]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L48}
  /// [google.cloud.backupdr.v1.FetchUsableBackupVaultsRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L812}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupVault> FetchUsableBackupVaults(
      google::cloud::backupdr::v1::FetchUsableBackupVaultsRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// Gets details of a BackupVault.
  ///
  /// @param name  Required. Name of the backupvault store resource name, in the format
  ///  'projects/{project_id}/locations/{location}/backupVaults/{resource_name}'
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.BackupVault])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupVault]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L48}
  /// [google.cloud.backupdr.v1.GetBackupVaultRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L916}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::BackupVault> GetBackupVault(
      std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Gets details of a BackupVault.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.GetBackupVaultRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.BackupVault])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupVault]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L48}
  /// [google.cloud.backupdr.v1.GetBackupVaultRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L916}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::BackupVault> GetBackupVault(
      google::cloud::backupdr::v1::GetBackupVaultRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Updates the settings of a BackupVault.
  ///
  /// @param backup_vault  Required. The resource being updated
  /// @param update_mask  Required. Field mask is used to specify the fields to be overwritten in the
  ///  BackupVault resource by the update.
  ///  The fields specified in the update_mask are relative to the resource, not
  ///  the full request. A field will be overwritten if it is in the mask. If the
  ///  user does not provide a mask then the request will fail.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupVault] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupVault]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L48}
  /// [google.cloud.backupdr.v1.UpdateBackupVaultRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L932}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupVault>> UpdateBackupVault(
      google::cloud::backupdr::v1::BackupVault const& backup_vault,
      google::protobuf::FieldMask const& update_mask, Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackupVault
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> UpdateBackupVault(
      NoAwaitTag, google::cloud::backupdr::v1::BackupVault const& backup_vault,
      google::protobuf::FieldMask const& update_mask, Options opts = {});

  // clang-format off
  ///
  /// Updates the settings of a BackupVault.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.UpdateBackupVaultRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupVault] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupVault]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L48}
  /// [google.cloud.backupdr.v1.UpdateBackupVaultRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L932}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupVault>> UpdateBackupVault(
      google::cloud::backupdr::v1::UpdateBackupVaultRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackupVault
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> UpdateBackupVault(
      NoAwaitTag,
      google::cloud::backupdr::v1::UpdateBackupVaultRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackupVault
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupVault>> UpdateBackupVault(
      google::longrunning::Operation const& operation, Options opts = {});

  // clang-format off
  ///
  /// Deletes a BackupVault.
  ///
  /// @param name  Required. Name of the resource.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.OperationMetadata] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DeleteBackupVaultRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L977}
  /// [google.cloud.backupdr.v1.OperationMetadata]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L811}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteBackupVault(std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackupVault
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> DeleteBackupVault(
      NoAwaitTag, std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Deletes a BackupVault.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.DeleteBackupVaultRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.OperationMetadata] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DeleteBackupVaultRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L977}
  /// [google.cloud.backupdr.v1.OperationMetadata]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L811}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteBackupVault(
      google::cloud::backupdr::v1::DeleteBackupVaultRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackupVault
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> DeleteBackupVault(
      NoAwaitTag,
      google::cloud::backupdr::v1::DeleteBackupVaultRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackupVault
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteBackupVault(google::longrunning::Operation const& operation,
                    Options opts = {});

  // clang-format off
  ///
  /// Lists DataSources in a given project and location.
  ///
  /// @param parent  Required. The project and location for which to retrieve data
  ///  sources information, in the format
  ///  'projects/{project_id}/locations/{location}'. In Cloud Backup and DR,
  ///  locations map to Google Cloud regions, for example **us-central1**.
  ///  To retrieve data sources for all locations, use "-" for the
  ///  '{location}' value.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.DataSource], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSource]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L223}
  /// [google.cloud.backupdr.v1.ListDataSourcesRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1028}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::DataSource> ListDataSources(
      std::string const& parent, Options opts = {});

  // clang-format off
  ///
  /// Lists DataSources in a given project and location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.ListDataSourcesRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.DataSource], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSource]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L223}
  /// [google.cloud.backupdr.v1.ListDataSourcesRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1028}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::DataSource> ListDataSources(
      google::cloud::backupdr::v1::ListDataSourcesRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// Gets details of a DataSource.
  ///
  /// @param name  Required. Name of the data source resource name, in the format
  ///  'projects/{project_id}/locations/{location}/backupVaults/{resource_name}/dataSource/{resource_name}'
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.DataSource])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSource]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L223}
  /// [google.cloud.backupdr.v1.GetDataSourceRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1076}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::DataSource> GetDataSource(
      std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Gets details of a DataSource.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.GetDataSourceRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.DataSource])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSource]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L223}
  /// [google.cloud.backupdr.v1.GetDataSourceRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1076}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::DataSource> GetDataSource(
      google::cloud::backupdr::v1::GetDataSourceRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Updates the settings of a DataSource.
  ///
  /// @param data_source  Required. The resource being updated
  /// @param update_mask  Required. Field mask is used to specify the fields to be overwritten in the
  ///  DataSource resource by the update.
  ///  The fields specified in the update_mask are relative to the resource, not
  ///  the full request. A field will be overwritten if it is in the mask. If the
  ///  user does not provide a mask then the request will fail.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.DataSource] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSource]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L223}
  /// [google.cloud.backupdr.v1.UpdateDataSourceRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1088}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::DataSource>> UpdateDataSource(
      google::cloud::backupdr::v1::DataSource const& data_source,
      google::protobuf::FieldMask const& update_mask, Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateDataSource
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> UpdateDataSource(
      NoAwaitTag, google::cloud::backupdr::v1::DataSource const& data_source,
      google::protobuf::FieldMask const& update_mask, Options opts = {});

  // clang-format off
  ///
  /// Updates the settings of a DataSource.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.UpdateDataSourceRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.DataSource] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSource]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L223}
  /// [google.cloud.backupdr.v1.UpdateDataSourceRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1088}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::DataSource>> UpdateDataSource(
      google::cloud::backupdr::v1::UpdateDataSourceRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateDataSource
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> UpdateDataSource(
      NoAwaitTag,
      google::cloud::backupdr::v1::UpdateDataSourceRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateDataSource
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::DataSource>> UpdateDataSource(
      google::longrunning::Operation const& operation, Options opts = {});

  // clang-format off
  ///
  /// Lists Backups in a given project and location.
  ///
  /// @param parent  Required. The project and location for which to retrieve backup
  ///  information, in the format
  ///  'projects/{project_id}/locations/{location}'. In Cloud Backup and DR,
  ///  locations map to Google Cloud regions, for example **us-central1**.
  ///  To retrieve data sources for all locations, use "-" for the
  ///  '{location}' value.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.Backup], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.Backup]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L527}
  /// [google.cloud.backupdr.v1.ListBackupsRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1123}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::Backup> ListBackups(
      std::string const& parent, Options opts = {});

  // clang-format off
  ///
  /// Lists Backups in a given project and location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.ListBackupsRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.Backup], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.Backup]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L527}
  /// [google.cloud.backupdr.v1.ListBackupsRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1123}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::Backup> ListBackups(
      google::cloud::backupdr::v1::ListBackupsRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// Fetch Backups for a given resource type.
  ///
  /// @param parent  Required. Datasources are the parent resource for the backups.
  ///  Format:
  ///  projects/{project}/locations/{location}/backupVaults/{backupVaultId}/dataSources/{datasourceId}
  /// @param resource_type  Required. The type of the GCP resource.
  ///  Ex: sqladmin.googleapis.com/Instance
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.Backup], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.Backup]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L527}
  /// [google.cloud.backupdr.v1.FetchBackupsForResourceTypeRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L860}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::Backup> FetchBackupsForResourceType(
      std::string const& parent, std::string const& resource_type,
      Options opts = {});

  // clang-format off
  ///
  /// Fetch Backups for a given resource type.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.FetchBackupsForResourceTypeRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.Backup], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.Backup]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L527}
  /// [google.cloud.backupdr.v1.FetchBackupsForResourceTypeRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L860}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::Backup> FetchBackupsForResourceType(
      google::cloud::backupdr::v1::FetchBackupsForResourceTypeRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// Gets details of a Backup.
  ///
  /// @param name  Required. Name of the data source resource name, in the format
  ///  'projects/{project_id}/locations/{location}/backupVaults/{backupVault}/dataSources/{datasource}/backups/{backup}'
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.Backup])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.Backup]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L527}
  /// [google.cloud.backupdr.v1.GetBackupRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1175}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::Backup> GetBackup(
      std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Gets details of a Backup.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.GetBackupRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.Backup])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.Backup]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L527}
  /// [google.cloud.backupdr.v1.GetBackupRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1175}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::Backup> GetBackup(
      google::cloud::backupdr::v1::GetBackupRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Updates the settings of a Backup.
  ///
  /// @param backup  Required. The resource being updated
  /// @param update_mask  Required. Field mask is used to specify the fields to be overwritten in the
  ///  Backup resource by the update.
  ///  The fields specified in the update_mask are relative to the resource, not
  ///  the full request. A field will be overwritten if it is in the mask. If the
  ///  user does not provide a mask then the request will fail.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.Backup] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.Backup]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L527}
  /// [google.cloud.backupdr.v1.UpdateBackupRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1189}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::Backup>> UpdateBackup(
      google::cloud::backupdr::v1::Backup const& backup,
      google::protobuf::FieldMask const& update_mask, Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackup
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> UpdateBackup(
      NoAwaitTag, google::cloud::backupdr::v1::Backup const& backup,
      google::protobuf::FieldMask const& update_mask, Options opts = {});

  // clang-format off
  ///
  /// Updates the settings of a Backup.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.UpdateBackupRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.Backup] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.Backup]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L527}
  /// [google.cloud.backupdr.v1.UpdateBackupRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1189}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::Backup>> UpdateBackup(
      google::cloud::backupdr::v1::UpdateBackupRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackup
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> UpdateBackup(
      NoAwaitTag,
      google::cloud::backupdr::v1::UpdateBackupRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackup
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::Backup>> UpdateBackup(
      google::longrunning::Operation const& operation, Options opts = {});

  // clang-format off
  ///
  /// Deletes a Backup.
  ///
  /// @param name  Required. Name of the resource.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.Backup] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.Backup]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L527}
  /// [google.cloud.backupdr.v1.DeleteBackupRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1221}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::Backup>> DeleteBackup(
      std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackup
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> DeleteBackup(NoAwaitTag,
                                                        std::string const& name,
                                                        Options opts = {});

  // clang-format off
  ///
  /// Deletes a Backup.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.DeleteBackupRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.Backup] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.Backup]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L527}
  /// [google.cloud.backupdr.v1.DeleteBackupRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1221}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::Backup>> DeleteBackup(
      google::cloud::backupdr::v1::DeleteBackupRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackup
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> DeleteBackup(
      NoAwaitTag,
      google::cloud::backupdr::v1::DeleteBackupRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackup
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::Backup>> DeleteBackup(
      google::longrunning::Operation const& operation, Options opts = {});

  // clang-format off
  ///
  /// Restore from a Backup
  ///
  /// @param name  Required. The resource name of the Backup instance, in the format
  ///  'projects/*/locations/*/backupVaults/*/dataSources/*/backups/'.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.RestoreBackupResponse] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.RestoreBackupRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1248}
  /// [google.cloud.backupdr.v1.RestoreBackupResponse]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1312}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::RestoreBackupResponse>>
  RestoreBackup(std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// @copybrief RestoreBackup
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> RestoreBackup(
      NoAwaitTag, std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Restore from a Backup
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.RestoreBackupRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.RestoreBackupResponse] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.RestoreBackupRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1248}
  /// [google.cloud.backupdr.v1.RestoreBackupResponse]: @googleapis_reference_link{google/cloud/backupdr/v1/backupvault.proto#L1312}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::RestoreBackupResponse>>
  RestoreBackup(
      google::cloud::backupdr::v1::RestoreBackupRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief RestoreBackup
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> RestoreBackup(
      NoAwaitTag,
      google::cloud::backupdr::v1::RestoreBackupRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief RestoreBackup
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::RestoreBackupResponse>>
  RestoreBackup(google::longrunning::Operation const& operation,
                Options opts = {});

  // clang-format off
  ///
  /// Create a BackupPlan
  ///
  /// @param parent  Required. The `BackupPlan` project and location in the format
  ///  `projects/{project}/locations/{location}`. In Cloud BackupDR locations
  ///  map to GCP regions, for example **us-central1**.
  /// @param backup_plan  Required. The `BackupPlan` resource object to create.
  /// @param backup_plan_id  Required. The name of the `BackupPlan` to create. The name must be unique
  ///  for the specified project and location.The name must start with a lowercase
  ///  letter followed by up to 62 lowercase letters, numbers, or hyphens.
  ///  Pattern, /[a-z][a-z0-9-]{,62}/.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupPlan] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlan]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L39}
  /// [google.cloud.backupdr.v1.CreateBackupPlanRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L325}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlan>> CreateBackupPlan(
      std::string const& parent,
      google::cloud::backupdr::v1::BackupPlan const& backup_plan,
      std::string const& backup_plan_id, Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateBackupPlan
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> CreateBackupPlan(
      NoAwaitTag, std::string const& parent,
      google::cloud::backupdr::v1::BackupPlan const& backup_plan,
      std::string const& backup_plan_id, Options opts = {});

  // clang-format off
  ///
  /// Create a BackupPlan
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.CreateBackupPlanRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupPlan] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlan]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L39}
  /// [google.cloud.backupdr.v1.CreateBackupPlanRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L325}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlan>> CreateBackupPlan(
      google::cloud::backupdr::v1::CreateBackupPlanRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateBackupPlan
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> CreateBackupPlan(
      NoAwaitTag,
      google::cloud::backupdr::v1::CreateBackupPlanRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateBackupPlan
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlan>> CreateBackupPlan(
      google::longrunning::Operation const& operation, Options opts = {});

  // clang-format off
  ///
  /// Update a BackupPlan.
  ///
  /// @param backup_plan  Required. The resource being updated
  /// @param update_mask  Required. The list of fields to update.
  ///  Field mask is used to specify the fields to be overwritten in the
  ///  BackupPlan resource by the update.
  ///  The fields specified in the update_mask are relative to the resource, not
  ///  the full request. A field will be overwritten if it is in the mask. If the
  ///  user does not provide a mask then the request will fail.
  ///  Currently, these fields are supported in update: description, schedules,
  ///  retention period, adding and removing Backup Rules.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupPlan] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlan]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L39}
  /// [google.cloud.backupdr.v1.UpdateBackupPlanRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L470}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlan>> UpdateBackupPlan(
      google::cloud::backupdr::v1::BackupPlan const& backup_plan,
      google::protobuf::FieldMask const& update_mask, Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackupPlan
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> UpdateBackupPlan(
      NoAwaitTag, google::cloud::backupdr::v1::BackupPlan const& backup_plan,
      google::protobuf::FieldMask const& update_mask, Options opts = {});

  // clang-format off
  ///
  /// Update a BackupPlan.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.UpdateBackupPlanRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupPlan] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlan]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L39}
  /// [google.cloud.backupdr.v1.UpdateBackupPlanRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L470}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlan>> UpdateBackupPlan(
      google::cloud::backupdr::v1::UpdateBackupPlanRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackupPlan
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> UpdateBackupPlan(
      NoAwaitTag,
      google::cloud::backupdr::v1::UpdateBackupPlanRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackupPlan
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlan>> UpdateBackupPlan(
      google::longrunning::Operation const& operation, Options opts = {});

  // clang-format off
  ///
  /// Gets details of a single BackupPlan.
  ///
  /// @param name  Required. The resource name of the `BackupPlan` to retrieve.
  ///  @n
  ///  Format: `projects/{project}/locations/{location}/backupPlans/{backup_plan}`
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.BackupPlan])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlan]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L39}
  /// [google.cloud.backupdr.v1.GetBackupPlanRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L426}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::BackupPlan> GetBackupPlan(
      std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Gets details of a single BackupPlan.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.GetBackupPlanRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.BackupPlan])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlan]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L39}
  /// [google.cloud.backupdr.v1.GetBackupPlanRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L426}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::BackupPlan> GetBackupPlan(
      google::cloud::backupdr::v1::GetBackupPlanRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Lists BackupPlans in a given project and location.
  ///
  /// @param parent  Required. The project and location for which to retrieve `BackupPlans`
  ///  information. Format: `projects/{project}/locations/{location}`. In Cloud
  ///  BackupDR, locations map to GCP regions, for e.g. **us-central1**. To
  ///  retrieve backup plans for all locations, use "-" for the
  ///  `{location}` value.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupPlan], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlan]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L39}
  /// [google.cloud.backupdr.v1.ListBackupPlansRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L365}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupPlan> ListBackupPlans(
      std::string const& parent, Options opts = {});

  // clang-format off
  ///
  /// Lists BackupPlans in a given project and location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.ListBackupPlansRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupPlan], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlan]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L39}
  /// [google.cloud.backupdr.v1.ListBackupPlansRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L365}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupPlan> ListBackupPlans(
      google::cloud::backupdr::v1::ListBackupPlansRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// Deletes a single BackupPlan.
  ///
  /// @param name  Required. The resource name of the `BackupPlan` to delete.
  ///  @n
  ///  Format: `projects/{project}/locations/{location}/backupPlans/{backup_plan}`
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.OperationMetadata] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DeleteBackupPlanRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L439}
  /// [google.cloud.backupdr.v1.OperationMetadata]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L811}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteBackupPlan(std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackupPlan
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> DeleteBackupPlan(
      NoAwaitTag, std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Deletes a single BackupPlan.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.DeleteBackupPlanRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.OperationMetadata] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DeleteBackupPlanRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L439}
  /// [google.cloud.backupdr.v1.OperationMetadata]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L811}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteBackupPlan(
      google::cloud::backupdr::v1::DeleteBackupPlanRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackupPlan
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> DeleteBackupPlan(
      NoAwaitTag,
      google::cloud::backupdr::v1::DeleteBackupPlanRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackupPlan
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteBackupPlan(google::longrunning::Operation const& operation,
                   Options opts = {});

  // clang-format off
  ///
  /// Gets details of a single BackupPlanRevision.
  ///
  /// @param name  Required. The resource name of the `BackupPlanRevision` to retrieve.
  ///  @n
  ///  Format:
  ///  `projects/{project}/locations/{location}/backupPlans/{backup_plan}/revisions/{revision}`
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.BackupPlanRevision])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanRevision]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L506}
  /// [google.cloud.backupdr.v1.GetBackupPlanRevisionRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L558}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::BackupPlanRevision>
  GetBackupPlanRevision(std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Gets details of a single BackupPlanRevision.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.GetBackupPlanRevisionRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.BackupPlanRevision])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanRevision]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L506}
  /// [google.cloud.backupdr.v1.GetBackupPlanRevisionRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L558}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::BackupPlanRevision>
  GetBackupPlanRevision(
      google::cloud::backupdr::v1::GetBackupPlanRevisionRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Lists BackupPlanRevisions in a given project and location.
  ///
  /// @param parent  Required. The project and location for which to retrieve
  ///  `BackupPlanRevisions` information. Format:
  ///  `projects/{project}/locations/{location}/backupPlans/{backup_plan}`. In
  ///  Cloud BackupDR, locations map to GCP regions, for e.g. **us-central1**.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupPlanRevision], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanRevision]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L506}
  /// [google.cloud.backupdr.v1.ListBackupPlanRevisionsRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L572}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupPlanRevision>
  ListBackupPlanRevisions(std::string const& parent, Options opts = {});

  // clang-format off
  ///
  /// Lists BackupPlanRevisions in a given project and location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.ListBackupPlanRevisionsRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupPlanRevision], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanRevision]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L506}
  /// [google.cloud.backupdr.v1.ListBackupPlanRevisionsRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplan.proto#L572}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupPlanRevision>
  ListBackupPlanRevisions(
      google::cloud::backupdr::v1::ListBackupPlanRevisionsRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// Create a BackupPlanAssociation
  ///
  /// @param parent  Required. The backup plan association project and location in the format
  ///  `projects/{project_id}/locations/{location}`. In Cloud BackupDR locations
  ///  map to GCP regions, for example **us-central1**.
  /// @param backup_plan_association  Required. The resource being created
  /// @param backup_plan_association_id  Required. The name of the backup plan association to create. The name must
  ///  be unique for the specified project and location.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupPlanAssociation] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.CreateBackupPlanAssociationRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L184}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>>
  CreateBackupPlanAssociation(
      std::string const& parent,
      google::cloud::backupdr::v1::BackupPlanAssociation const&
          backup_plan_association,
      std::string const& backup_plan_association_id, Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateBackupPlanAssociation
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> CreateBackupPlanAssociation(
      NoAwaitTag, std::string const& parent,
      google::cloud::backupdr::v1::BackupPlanAssociation const&
          backup_plan_association,
      std::string const& backup_plan_association_id, Options opts = {});

  // clang-format off
  ///
  /// Create a BackupPlanAssociation
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.CreateBackupPlanAssociationRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupPlanAssociation] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.CreateBackupPlanAssociationRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L184}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>>
  CreateBackupPlanAssociation(
      google::cloud::backupdr::v1::CreateBackupPlanAssociationRequest const&
          request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateBackupPlanAssociation
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> CreateBackupPlanAssociation(
      NoAwaitTag,
      google::cloud::backupdr::v1::CreateBackupPlanAssociationRequest const&
          request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief CreateBackupPlanAssociation
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>>
  CreateBackupPlanAssociation(google::longrunning::Operation const& operation,
                              Options opts = {});

  // clang-format off
  ///
  /// Update a BackupPlanAssociation.
  ///
  /// @param backup_plan_association  Required. The resource being updated
  /// @param update_mask  Required. The list of fields to update.
  ///  Field mask is used to specify the fields to be overwritten in the
  ///  BackupPlanAssociation resource by the update.
  ///  The fields specified in the update_mask are relative to the resource, not
  ///  the full request. A field will be overwritten if it is in the mask. If the
  ///  user does not provide a mask then the request will fail.
  ///  Currently backup_plan_association.backup_plan is the only supported field.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupPlanAssociation] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.UpdateBackupPlanAssociationRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L371}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>>
  UpdateBackupPlanAssociation(
      google::cloud::backupdr::v1::BackupPlanAssociation const&
          backup_plan_association,
      google::protobuf::FieldMask const& update_mask, Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackupPlanAssociation
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> UpdateBackupPlanAssociation(
      NoAwaitTag,
      google::cloud::backupdr::v1::BackupPlanAssociation const&
          backup_plan_association,
      google::protobuf::FieldMask const& update_mask, Options opts = {});

  // clang-format off
  ///
  /// Update a BackupPlanAssociation.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.UpdateBackupPlanAssociationRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupPlanAssociation] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.UpdateBackupPlanAssociationRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L371}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>>
  UpdateBackupPlanAssociation(
      google::cloud::backupdr::v1::UpdateBackupPlanAssociationRequest const&
          request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackupPlanAssociation
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> UpdateBackupPlanAssociation(
      NoAwaitTag,
      google::cloud::backupdr::v1::UpdateBackupPlanAssociationRequest const&
          request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief UpdateBackupPlanAssociation
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>>
  UpdateBackupPlanAssociation(google::longrunning::Operation const& operation,
                              Options opts = {});

  // clang-format off
  ///
  /// Gets details of a single BackupPlanAssociation.
  ///
  /// @param name  Required. Name of the backup plan association resource, in the format
  ///  `projects/{project}/locations/{location}/backupPlanAssociations/{backupPlanAssociationId}`
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.BackupPlanAssociation])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.GetBackupPlanAssociationRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L329}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>
  GetBackupPlanAssociation(std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Gets details of a single BackupPlanAssociation.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.GetBackupPlanAssociationRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.BackupPlanAssociation])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.GetBackupPlanAssociationRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L329}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>
  GetBackupPlanAssociation(
      google::cloud::backupdr::v1::GetBackupPlanAssociationRequest const&
          request,
      Options opts = {});

  // clang-format off
  ///
  /// Lists BackupPlanAssociations in a given project and location.
  ///
  /// @param parent  Required. The project and location for which to retrieve backup Plan
  ///  Associations information, in the format
  ///  `projects/{project_id}/locations/{location}`. In Cloud BackupDR, locations
  ///  map to GCP regions, for example **us-central1**. To retrieve backup plan
  ///  associations for all locations, use "-" for the
  ///  `{location}` value.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupPlanAssociation], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.ListBackupPlanAssociationsRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L224}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupPlanAssociation>
  ListBackupPlanAssociations(std::string const& parent, Options opts = {});

  // clang-format off
  ///
  /// Lists BackupPlanAssociations in a given project and location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.ListBackupPlanAssociationsRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupPlanAssociation], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.ListBackupPlanAssociationsRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L224}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupPlanAssociation>
  ListBackupPlanAssociations(
      google::cloud::backupdr::v1::ListBackupPlanAssociationsRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// List BackupPlanAssociations for a given resource type.
  ///
  /// @param parent  Required. The parent resource name.
  ///  Format: projects/{project}/locations/{location}
  /// @param resource_type  Required. The type of the GCP resource.
  ///  Ex: sql.googleapis.com/Instance
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupPlanAssociation], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.FetchBackupPlanAssociationsForResourceTypeRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L269}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupPlanAssociation>
  FetchBackupPlanAssociationsForResourceType(std::string const& parent,
                                             std::string const& resource_type,
                                             Options opts = {});

  // clang-format off
  ///
  /// List BackupPlanAssociations for a given resource type.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.FetchBackupPlanAssociationsForResourceTypeRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.BackupPlanAssociation], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.FetchBackupPlanAssociationsForResourceTypeRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L269}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::BackupPlanAssociation>
  FetchBackupPlanAssociationsForResourceType(
      google::cloud::backupdr::v1::
          FetchBackupPlanAssociationsForResourceTypeRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// Deletes a single BackupPlanAssociation.
  ///
  /// @param name  Required. Name of the backup plan association resource, in the format
  ///  `projects/{project}/locations/{location}/backupPlanAssociations/{backupPlanAssociationId}`
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.OperationMetadata] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DeleteBackupPlanAssociationRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L341}
  /// [google.cloud.backupdr.v1.OperationMetadata]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L811}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteBackupPlanAssociation(std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackupPlanAssociation
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> DeleteBackupPlanAssociation(
      NoAwaitTag, std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Deletes a single BackupPlanAssociation.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.DeleteBackupPlanAssociationRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.OperationMetadata] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DeleteBackupPlanAssociationRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L341}
  /// [google.cloud.backupdr.v1.OperationMetadata]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L811}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteBackupPlanAssociation(
      google::cloud::backupdr::v1::DeleteBackupPlanAssociationRequest const&
          request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackupPlanAssociation
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> DeleteBackupPlanAssociation(
      NoAwaitTag,
      google::cloud::backupdr::v1::DeleteBackupPlanAssociationRequest const&
          request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief DeleteBackupPlanAssociation
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::OperationMetadata>>
  DeleteBackupPlanAssociation(google::longrunning::Operation const& operation,
                              Options opts = {});

  // clang-format off
  ///
  /// Triggers a new Backup.
  ///
  /// @param name  Required. Name of the backup plan association resource, in the format
  ///  `projects/{project}/locations/{location}/backupPlanAssociations/{backupPlanAssociationId}`
  /// @param rule_id  Required. backup rule_id for which a backup needs to be triggered.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupPlanAssociation] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.TriggerBackupRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L406}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>>
  TriggerBackup(std::string const& name, std::string const& rule_id,
                Options opts = {});

  // clang-format off
  ///
  /// @copybrief TriggerBackup
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> TriggerBackup(
      NoAwaitTag, std::string const& name, std::string const& rule_id,
      Options opts = {});

  // clang-format off
  ///
  /// Triggers a new Backup.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.TriggerBackupRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.BackupPlanAssociation] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.BackupPlanAssociation]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L37}
  /// [google.cloud.backupdr.v1.TriggerBackupRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupplanassociation.proto#L406}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>>
  TriggerBackup(
      google::cloud::backupdr::v1::TriggerBackupRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief TriggerBackup
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> TriggerBackup(
      NoAwaitTag,
      google::cloud::backupdr::v1::TriggerBackupRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief TriggerBackup
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::BackupPlanAssociation>>
  TriggerBackup(google::longrunning::Operation const& operation,
                Options opts = {});

  // clang-format off
  ///
  /// Gets details of a single DataSourceReference.
  ///
  /// @param name  Required. The name of the DataSourceReference to retrieve.
  ///  Format:
  ///  projects/{project}/locations/{location}/dataSourceReferences/{data_source_reference}
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.DataSourceReference])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSourceReference]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L34}
  /// [google.cloud.backupdr.v1.GetDataSourceReferenceRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L118}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::DataSourceReference>
  GetDataSourceReference(std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Gets details of a single DataSourceReference.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.GetDataSourceReferenceRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.backupdr.v1.DataSourceReference])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSourceReference]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L34}
  /// [google.cloud.backupdr.v1.GetDataSourceReferenceRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L118}
  ///
  // clang-format on
  StatusOr<google::cloud::backupdr::v1::DataSourceReference>
  GetDataSourceReference(
      google::cloud::backupdr::v1::GetDataSourceReferenceRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Lists DataSourceReferences for a given project and location.
  ///
  /// @param parent  Required. The parent resource name.
  ///  Format: projects/{project}/locations/{location}
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.DataSourceReference], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSourceReference]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L34}
  /// [google.cloud.backupdr.v1.ListDataSourceReferencesRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L131}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::DataSourceReference>
  ListDataSourceReferences(std::string const& parent, Options opts = {});

  // clang-format off
  ///
  /// Lists DataSourceReferences for a given project and location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.ListDataSourceReferencesRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.DataSourceReference], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSourceReference]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L34}
  /// [google.cloud.backupdr.v1.ListDataSourceReferencesRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L131}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::DataSourceReference>
  ListDataSourceReferences(
      google::cloud::backupdr::v1::ListDataSourceReferencesRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// Fetch DataSourceReferences for a given project, location and resource type.
  ///
  /// @param parent  Required. The parent resource name.
  ///  Format: projects/{project}/locations/{location}
  /// @param resource_type  Required. The type of the GCP resource.
  ///  Ex: sql.googleapis.com/Instance
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.DataSourceReference], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSourceReference]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L34}
  /// [google.cloud.backupdr.v1.FetchDataSourceReferencesForResourceTypeRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L189}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::DataSourceReference>
  FetchDataSourceReferencesForResourceType(std::string const& parent,
                                           std::string const& resource_type,
                                           Options opts = {});

  // clang-format off
  ///
  /// Fetch DataSourceReferences for a given project, location and resource type.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.FetchDataSourceReferencesForResourceTypeRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.backupdr.v1.DataSourceReference], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.DataSourceReference]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L34}
  /// [google.cloud.backupdr.v1.FetchDataSourceReferencesForResourceTypeRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/datasourcereference.proto#L189}
  ///
  // clang-format on
  StreamRange<google::cloud::backupdr::v1::DataSourceReference>
  FetchDataSourceReferencesForResourceType(
      google::cloud::backupdr::v1::
          FetchDataSourceReferencesForResourceTypeRequest request,
      Options opts = {});

  // clang-format off
  ///
  /// Initializes the service related config for a project.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.backupdr.v1.InitializeServiceRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return A [`future`] that becomes satisfied when the LRO
  ///     ([Long Running Operation]) completes or the polling policy in effect
  ///     for this call is exhausted. The future is satisfied with an error if
  ///     the LRO completes with an error or the polling policy is exhausted.
  ///     In this case the [`StatusOr`] returned by the future contains the
  ///     error. If the LRO completes successfully the value of the future
  ///     contains the LRO's result. For this RPC the result is a
  ///     [google.cloud.backupdr.v1.InitializeServiceResponse] proto message.
  ///     The C++ class representing this message is created by Protobuf, using
  ///     the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [Long Running Operation]: https://google.aip.dev/151
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.backupdr.v1.InitializeServiceRequest]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L759}
  /// [google.cloud.backupdr.v1.InitializeServiceResponse]: @googleapis_reference_link{google/cloud/backupdr/v1/backupdr.proto#L798}
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::InitializeServiceResponse>>
  InitializeService(
      google::cloud::backupdr::v1::InitializeServiceRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief InitializeService
  ///
  /// Specifying the [`NoAwaitTag`] immediately returns the
  /// [`google::longrunning::Operation`] that corresponds to the Long Running
  /// Operation that has been started. No polling for operation status occurs.
  ///
  /// [`NoAwaitTag`]: @ref google::cloud::NoAwaitTag
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> InitializeService(
      NoAwaitTag,
      google::cloud::backupdr::v1::InitializeServiceRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// @copybrief InitializeService
  ///
  /// This method accepts a `google::longrunning::Operation` that corresponds
  /// to a previously started Long Running Operation (LRO) and polls the status
  /// of the LRO in the background.
  ///
  // clang-format on
  future<StatusOr<google::cloud::backupdr::v1::InitializeServiceResponse>>
  InitializeService(google::longrunning::Operation const& operation,
                    Options opts = {});

  // clang-format off
  ///
  /// Lists information about the supported locations for this service.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.location.ListLocationsRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.cloud.location.Location], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.location.ListLocationsRequest]: @googleapis_reference_link{google/cloud/location/locations.proto#L58}
  /// [google.cloud.location.Location]: @googleapis_reference_link{google/cloud/location/locations.proto#L88}
  ///
  // clang-format on
  StreamRange<google::cloud::location::Location> ListLocations(
      google::cloud::location::ListLocationsRequest request, Options opts = {});

  // clang-format off
  ///
  /// Gets information about a location.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.cloud.location.GetLocationRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.cloud.location.Location])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.cloud.location.GetLocationRequest]: @googleapis_reference_link{google/cloud/location/locations.proto#L82}
  /// [google.cloud.location.Location]: @googleapis_reference_link{google/cloud/location/locations.proto#L88}
  ///
  // clang-format on
  StatusOr<google::cloud::location::Location> GetLocation(
      google::cloud::location::GetLocationRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Sets the access control policy on the specified resource. Replaces any
  /// existing policy.
  ///
  /// Can return `NOT_FOUND`, `INVALID_ARGUMENT`, and `PERMISSION_DENIED` errors.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.iam.v1.SetIamPolicyRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.iam.v1.Policy])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.iam.v1.Policy]: @googleapis_reference_link{google/iam/v1/policy.proto#L102}
  /// [google.iam.v1.SetIamPolicyRequest]: @googleapis_reference_link{google/iam/v1/iam_policy.proto#L100}
  ///
  // clang-format on
  StatusOr<google::iam::v1::Policy> SetIamPolicy(
      google::iam::v1::SetIamPolicyRequest const& request, Options opts = {});

  // clang-format off
  ///
  /// Gets the access control policy for a resource.
  /// Returns an empty policy if the resource exists and does not have a policy
  /// set.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.iam.v1.GetIamPolicyRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.iam.v1.Policy])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.iam.v1.GetIamPolicyRequest]: @googleapis_reference_link{google/iam/v1/iam_policy.proto#L123}
  /// [google.iam.v1.Policy]: @googleapis_reference_link{google/iam/v1/policy.proto#L102}
  ///
  // clang-format on
  StatusOr<google::iam::v1::Policy> GetIamPolicy(
      google::iam::v1::GetIamPolicyRequest const& request, Options opts = {});

  // clang-format off
  ///
  /// Returns permissions that a caller has on the specified resource.
  /// If the resource does not exist, this will return an empty set of
  /// permissions, not a `NOT_FOUND` error.
  ///
  /// Note: This operation is designed to be used for building permission-aware
  /// UIs and command-line tools, not for authorization checking. This operation
  /// may "fail open" without warning.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.iam.v1.TestIamPermissionsRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.iam.v1.TestIamPermissionsResponse])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.iam.v1.TestIamPermissionsRequest]: @googleapis_reference_link{google/iam/v1/iam_policy.proto#L137}
  /// [google.iam.v1.TestIamPermissionsResponse]: @googleapis_reference_link{google/iam/v1/iam_policy.proto#L153}
  ///
  // clang-format on
  StatusOr<google::iam::v1::TestIamPermissionsResponse> TestIamPermissions(
      google::iam::v1::TestIamPermissionsRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Lists operations that match the specified filter in the request. If the
  /// server doesn't support this method, it returns `UNIMPLEMENTED`.
  ///
  /// @param name  The name of the operation's parent resource.
  /// @param filter  The standard list filter.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.longrunning.Operation], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.longrunning.ListOperationsRequest]: @googleapis_reference_link{google/longrunning/operations.proto#L167}
  /// [google.longrunning.Operation]: @googleapis_reference_link{google/longrunning/operations.proto#L121}
  ///
  // clang-format on
  StreamRange<google::longrunning::Operation> ListOperations(
      std::string const& name, std::string const& filter, Options opts = {});

  // clang-format off
  ///
  /// Lists operations that match the specified filter in the request. If the
  /// server doesn't support this method, it returns `UNIMPLEMENTED`.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.longrunning.ListOperationsRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [StreamRange](@ref google::cloud::StreamRange)
  ///     to iterate of the results. See the documentation of this type for
  ///     details. In brief, this class has `begin()` and `end()` member
  ///     functions returning a iterator class meeting the
  ///     [input iterator requirements]. The value type for this iterator is a
  ///     [`StatusOr`] as the iteration may fail even after some values are
  ///     retrieved successfully, for example, if there is a network disconnect.
  ///     An empty set of results does not indicate an error, it indicates
  ///     that there are no resources meeting the request criteria.
  ///     On a successful iteration the `StatusOr<T>` contains elements of type
  ///     [google.longrunning.Operation], or rather,
  ///     the C++ class generated by Protobuf from that type. Please consult the
  ///     Protobuf documentation for details on the [Protobuf mapping rules].
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.longrunning.ListOperationsRequest]: @googleapis_reference_link{google/longrunning/operations.proto#L167}
  /// [google.longrunning.Operation]: @googleapis_reference_link{google/longrunning/operations.proto#L121}
  ///
  // clang-format on
  StreamRange<google::longrunning::Operation> ListOperations(
      google::longrunning::ListOperationsRequest request, Options opts = {});

  // clang-format off
  ///
  /// Gets the latest state of a long-running operation.  Clients can use this
  /// method to poll the operation result at intervals as recommended by the API
  /// service.
  ///
  /// @param name  The name of the operation resource.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.longrunning.Operation])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.longrunning.GetOperationRequest]: @googleapis_reference_link{google/longrunning/operations.proto#L160}
  /// [google.longrunning.Operation]: @googleapis_reference_link{google/longrunning/operations.proto#L121}
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> GetOperation(std::string const& name,
                                                        Options opts = {});

  // clang-format off
  ///
  /// Gets the latest state of a long-running operation.  Clients can use this
  /// method to poll the operation result at intervals as recommended by the API
  /// service.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.longrunning.GetOperationRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return the result of the RPC. The response message type
  ///     ([google.longrunning.Operation])
  ///     is mapped to a C++ class using the [Protobuf mapping rules].
  ///     If the request fails, the [`StatusOr`] contains the error details.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.longrunning.GetOperationRequest]: @googleapis_reference_link{google/longrunning/operations.proto#L160}
  /// [google.longrunning.Operation]: @googleapis_reference_link{google/longrunning/operations.proto#L121}
  ///
  // clang-format on
  StatusOr<google::longrunning::Operation> GetOperation(
      google::longrunning::GetOperationRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Deletes a long-running operation. This method indicates that the client is
  /// no longer interested in the operation result. It does not cancel the
  /// operation. If the server doesn't support this method, it returns
  /// `google.rpc.Code.UNIMPLEMENTED`.
  ///
  /// @param name  The name of the operation resource to be deleted.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [`Status`] object. If the request failed, the
  ///     status contains the details of the failure.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.longrunning.DeleteOperationRequest]: @googleapis_reference_link{google/longrunning/operations.proto#L219}
  ///
  // clang-format on
  Status DeleteOperation(std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Deletes a long-running operation. This method indicates that the client is
  /// no longer interested in the operation result. It does not cancel the
  /// operation. If the server doesn't support this method, it returns
  /// `google.rpc.Code.UNIMPLEMENTED`.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.longrunning.DeleteOperationRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [`Status`] object. If the request failed, the
  ///     status contains the details of the failure.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.longrunning.DeleteOperationRequest]: @googleapis_reference_link{google/longrunning/operations.proto#L219}
  ///
  // clang-format on
  Status DeleteOperation(
      google::longrunning::DeleteOperationRequest const& request,
      Options opts = {});

  // clang-format off
  ///
  /// Starts asynchronous cancellation on a long-running operation.  The server
  /// makes a best effort to cancel the operation, but success is not
  /// guaranteed.  If the server doesn't support this method, it returns
  /// `google.rpc.Code.UNIMPLEMENTED`.  Clients can use
  /// [Operations.GetOperation][google.longrunning.Operations.GetOperation] or
  /// other methods to check whether the cancellation succeeded or whether the
  /// operation completed despite cancellation. On successful cancellation,
  /// the operation is not deleted; instead, it becomes an operation with
  /// an [Operation.error][google.longrunning.Operation.error] value with a
  /// [google.rpc.Status.code][google.rpc.Status.code] of `1`, corresponding to
  /// `Code.CANCELLED`.
  ///
  /// @param name  The name of the operation resource to be cancelled.
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [`Status`] object. If the request failed, the
  ///     status contains the details of the failure.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.longrunning.CancelOperationRequest]: @googleapis_reference_link{google/longrunning/operations.proto#L212}
  /// [google.longrunning.Operation.error]: @googleapis_reference_link{google/longrunning/operations.proto#L144}
  /// [google.longrunning.Operations.GetOperation]: @googleapis_reference_link{google/longrunning/operations.proto#L70}
  /// [google.rpc.Status.code]: @googleapis_reference_link{google/rpc/status.proto#L38}
  ///
  // clang-format on
  Status CancelOperation(std::string const& name, Options opts = {});

  // clang-format off
  ///
  /// Starts asynchronous cancellation on a long-running operation.  The server
  /// makes a best effort to cancel the operation, but success is not
  /// guaranteed.  If the server doesn't support this method, it returns
  /// `google.rpc.Code.UNIMPLEMENTED`.  Clients can use
  /// [Operations.GetOperation][google.longrunning.Operations.GetOperation] or
  /// other methods to check whether the cancellation succeeded or whether the
  /// operation completed despite cancellation. On successful cancellation,
  /// the operation is not deleted; instead, it becomes an operation with
  /// an [Operation.error][google.longrunning.Operation.error] value with a
  /// [google.rpc.Status.code][google.rpc.Status.code] of `1`, corresponding to
  /// `Code.CANCELLED`.
  ///
  /// @param request Unary RPCs, such as the one wrapped by this
  ///     function, receive a single `request` proto message which includes all
  ///     the inputs for the RPC. In this case, the proto message is a
  ///     [google.longrunning.CancelOperationRequest].
  ///     Proto messages are converted to C++ classes by Protobuf, using the
  ///     [Protobuf mapping rules].
  /// @param opts Optional. Override the class-level options, such as retry and
  ///     backoff policies.
  /// @return a [`Status`] object. If the request failed, the
  ///     status contains the details of the failure.
  ///
  /// [Protobuf mapping rules]: https://protobuf.dev/reference/cpp/cpp-generated/
  /// [input iterator requirements]: https://en.cppreference.com/w/cpp/named_req/InputIterator
  /// [`std::string`]: https://en.cppreference.com/w/cpp/string/basic_string
  /// [`future`]: @ref google::cloud::future
  /// [`StatusOr`]: @ref google::cloud::StatusOr
  /// [`Status`]: @ref google::cloud::Status
  /// [google.longrunning.CancelOperationRequest]: @googleapis_reference_link{google/longrunning/operations.proto#L212}
  /// [google.longrunning.Operation.error]: @googleapis_reference_link{google/longrunning/operations.proto#L144}
  /// [google.longrunning.Operations.GetOperation]: @googleapis_reference_link{google/longrunning/operations.proto#L70}
  /// [google.rpc.Status.code]: @googleapis_reference_link{google/rpc/status.proto#L38}
  ///
  // clang-format on
  Status CancelOperation(
      google::longrunning::CancelOperationRequest const& request,
      Options opts = {});

 private:
  std::shared_ptr<BackupDRConnection> connection_;
  Options options_;
};

GOOGLE_CLOUD_CPP_INLINE_NAMESPACE_END
}  // namespace backupdr_v1
}  // namespace cloud
}  // namespace google

#endif  // GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_BACKUPDR_V1_BACKUP_DR_CLIENT_H
