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// Copyright Sebastian Jeckel 2014.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef REACT_SIGNAL_H_INCLUDED
#define REACT_SIGNAL_H_INCLUDED
#pragma once
#if _MSC_VER && !__INTEL_COMPILER
#pragma warning(disable : 4503)
#endif
#include "react/detail/Defs.h"
#include <functional>
#include <memory>
#include <tuple>
#include <type_traits>
#include <utility>
#include "react/Forward.h"
#include "react/Observer.h"
#include "react/TypeTraits.h"
#include "react/detail/SignalBase.h"
namespace react {
namespace impl {
template <typename... TSignals> struct DomainTrait;
template <typename... TSignals>
using domain_t = typename DomainTrait<std::decay_t<TSignals>...>::type;
template <typename TSignal>
using value_t = typename std::decay_t<TSignal>::value_type;
template <typename T>
using if_not_signal_t = std::enable_if_t<!IsSignal<std::decay_t<T>>::value>;
template <typename T>
using if_signal_t = std::enable_if_t<IsSignal<std::decay_t<T>>::value>;
template <typename T>
using if_not_event_t = std::enable_if_t<!IsEvent<std::decay_t<T>>::value>;
template <typename T>
using if_event_t = std::enable_if_t<IsEvent<std::decay_t<T>>::value>;
template <typename TSignal> struct DomainTrait<TSignal> {
using type = typename TSignal::DomainT;
};
template <typename TSignal, typename... TSignals>
struct DomainTrait<TSignal, TSignals...> {
static_assert(std::is_same<typename DomainTrait<TSignal>::type,
typename DomainTrait<TSignals...>::type>::value,
"domain mismatch");
using type = typename TSignal::DomainT;
};
template <typename... TSignals> struct DomainTrait<SignalPack<TSignals...>> {
using type = typename DomainTrait<TSignals...>::type;
};
template <typename S, typename F, typename... Args>
using functor_t = FunctionOp<S, F, Args...>;
template <typename D, typename S, typename TOp>
using signal_op_node_t = SignalOpNode<D, S, TOp>;
template <typename D, typename S, typename F, typename... Args>
auto make_op_node(F &&f, Args &&... args) {
using TOp = functor_t<S, F, std::decay_t<Args>...>;
return std::make_shared<signal_op_node_t<D, S, TOp>>(
TOp{std::forward<F>(f), std::forward<Args>(args)...});
}
template <typename F, typename... TSignals>
auto make_op_signal(F &&f, TSignals &&... args) {
using D = domain_t<TSignals...>;
using S = std::result_of_t<F(value_t<TSignals>...)>;
return Signal<D, S>{make_op_node<D, S>(
std::forward<F>(f), GetNodePtr(std::forward<TSignals>(args))...)};
}
using namespace std::placeholders;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// SignalPack - Wraps several nodes in a tuple. Create with comma operator.
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename... TSignals> struct SignalPack {
SignalPack(const TSignals &... deps) : Data{deps...} {}
template <typename... TCurSignals, typename TSignal>
SignalPack(const SignalPack<TCurSignals...> &curArgs, const TSignal &newArg)
: Data{std::tuple_cat(curArgs.Data, std::tie(newArg))} {}
std::tuple<const TSignals &...> Data;
};
///////////////////////////////////////////////////////////////////////////////////////////////////
/// With - Utility function to create a SignalPack
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename... TSignals>
auto With(const TSignals &... some_signals) -> SignalPack<TSignals...> {
return SignalPack<TSignals...>{some_signals...};
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// MakeVar
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename D, typename V, typename S = typename std::decay<V>::type,
class = impl::if_not_signal_t<S>, class = impl::if_not_event_t<S>>
auto MakeVar(V &&value) -> VarSignal<D, S> {
return VarSignal<D, S>(
std::make_shared<REACT_IMPL::VarNode<D, S>>(std::forward<V>(value)));
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// MakeVar (higher order reactives)
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename D, typename V, typename S = typename std::decay<V>::type,
typename TInner = typename S::value_type,
class = typename std::enable_if<IsSignal<S>::value>::type>
auto MakeVar(V &&value) -> VarSignal<D, Signal<D, TInner>> {
return VarSignal<D, Signal<D, TInner>>(
std::make_shared<REACT_IMPL::VarNode<D, Signal<D, TInner>>>(
std::forward<V>(value)));
}
template <typename D, typename V, typename S = typename std::decay<V>::type,
typename TInner = typename S::value_type,
class = typename std::enable_if<IsEvent<S>::value>::type>
auto MakeVar(V &&value) -> VarSignal<D, Events<D, TInner>> {
return VarSignal<D, Events<D, TInner>>(
std::make_shared<REACT_IMPL::VarNode<D, Events<D, TInner>>>(
std::forward<V>(value)));
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// MakeSignal
///////////////////////////////////////////////////////////////////////////////////////////////////
// Single arg
template <typename D, typename V, typename FIn, typename F = std::decay_t<FIn>,
typename S = std::result_of_t<F(V)>>
auto MakeSignal(const Signal<D, V> &arg, FIn &&func) {
return Signal<D, S>(
impl::make_op_node<D, S>(std::forward<FIn>(func), GetNodePtr(arg)));
}
// Multiple args
template <typename D, typename S, typename F, typename Tuple, std::size_t... I>
auto MakeNode(F &&f, const Tuple &tuple, std::index_sequence<I...>) {
return impl::make_op_node<D, S>(std::forward<F>(f),
GetNodePtr(std::get<I>(tuple))...);
}
// Multiple args
template <typename... TSignals, typename FIn,
typename D = impl::domain_t<TSignals...>,
typename F = std::decay_t<FIn>,
typename S = std::result_of_t<F(ValueT<TSignals>...)>>
auto MakeSignal(const SignalPack<TSignals...> &argPack, FIn &&func) {
return Signal<D, S>{
MakeNode<D, S>(std::forward<FIn>(func), argPack.Data,
impl::indices_t<std::tuple<const TSignals &...>>())};
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// ValueTypeTrait
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename S> struct ValueTypeTrait { using type = S; };
template <typename S> struct ValueTypeTrait<S &> {
using type = std::reference_wrapper<S>;
};
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Signal
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename D, typename S> struct Signal {
using value_type = typename ValueTypeTrait<S>::type;
using ValueT = value_type;
using NodeT = REACT_IMPL::SignalNode<D, value_type>;
using NodePtrT = std::shared_ptr<NodeT>;
using DomainT = D;
Signal() : ptr_{} {}
explicit Signal(NodePtrT p) : ptr_{std::move(p)} {}
// Signal(const Signal &) = delete;
// Signal& operator =(const Signal &) = delete;
// Signal(Signal &&) = default;
// Signal& operator =(Signal &&) = default;
const value_type &Value() const { return ptr_->ValueRef(); }
const value_type &operator()() const { return Value(); }
template <typename R> bool Equals(const Signal<D, R> &other) const {
return ptr_ == other.ptr_;
}
const NodePtrT &node_ptr() const { return ptr_; }
bool Equals(const Signal &other) const { return ptr_ == other.ptr_; }
protected:
using input_manager_type = REACT_IMPL::InputManager<D>;
static input_manager_type &input_manager() {
return REACT_IMPL::DomainSpecificInputManager<D>::Instance();
}
private:
NodePtrT ptr_;
};
template <typename D, typename L, typename R>
bool Equals(const Signal<D, L> &lhs, const Signal<D, R> &rhs) {
return lhs.Equals(rhs);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Operators
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename D, typename LV, typename RV>
auto operator+(const Signal<D, LV> &l, const Signal<D, RV> &r) {
return impl::make_op_signal(std::plus<>(), l, r);
}
template <typename D, typename LV, typename RV,
class = impl::if_not_signal_t<RV>>
auto operator+(const Signal<D, LV> &l, RV &&r) {
return impl::make_op_signal(
std::bind(std::plus<>(), impl::_1, std::forward<RV>(r)), l);
}
template <typename D, typename LV, typename RV,
class = impl::if_not_signal_t<LV>>
auto operator+(LV &&l, const Signal<D, RV> &r) {
return impl::make_op_signal(
std::bind(std::plus<>(), std::forward<LV>(l), impl::_1), r);
}
template <typename D, typename LV, typename RV>
auto operator-(const Signal<D, LV> &l, const Signal<D, RV> &r) {
return impl::make_op_signal(std::minus<>(), l, r);
}
template <typename D, typename LV, typename RV,
class = impl::if_not_signal_t<RV>>
auto operator-(const Signal<D, LV> &l, RV &&r) {
return impl::make_op_signal(
std::bind(std::minus<>(), impl::_1, std::forward<RV>(r)), l);
}
template <typename D, typename LV, typename RV,
class = impl::if_not_signal_t<LV>>
auto operator-(LV &&l, const Signal<D, RV> &r) {
return impl::make_op_signal(
std::bind(std::minus<>(), std::forward<LV>(l), impl::_1), r);
}
template <typename D, typename LV, typename RV>
auto operator*(const Signal<D, LV> &l, const Signal<D, RV> &r) {
return impl::make_op_signal(std::multiplies<>(), l, r);
}
template <typename D, typename LV, typename RV,
class = impl::if_not_signal_t<RV>>
auto operator*(const Signal<D, LV> &l, RV &&r) {
return impl::make_op_signal(
std::bind(std::multiplies<>(), impl::_1, std::forward<RV>(r)), l);
}
template <typename D, typename LV, typename RV,
class = impl::if_not_signal_t<LV>>
auto operator*(LV &&l, const Signal<D, RV> &r) {
return impl::make_op_signal(
std::bind(std::multiplies<>(), std::forward<LV>(l), impl::_1), r);
}
template <typename D, typename LV, typename RV>
auto operator/(const Signal<D, LV> &l, const Signal<D, RV> &r) {
return impl::make_op_signal(std::divides<>(), l, r);
}
template <typename D, typename LV, typename RV,
class = impl::if_not_signal_t<RV>>
auto operator/(const Signal<D, LV> &l, RV &&r) {
return impl::make_op_signal(
std::bind(std::divides<>(), impl::_1, std::forward<RV>(r)), l);
}
template <typename D, typename LV, typename RV,
class = impl::if_not_signal_t<LV>>
auto operator/(LV &&l, const Signal<D, RV> &r) {
return impl::make_op_signal(
std::bind(std::divides<>(), std::forward<LV>(l), impl::_1), r);
}
template <typename D, typename S>
Signal<D, S> operator-(const Signal<D, S> &in) {
return S{-1} * in;
}
template <typename D, typename S>
const auto &GetNodePtr(const Signal<D, S> &s) {
return s.node_ptr();
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Flatten
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename D, typename TInnerSignal,
typename TInnerValue = typename TInnerSignal::value_type>
auto Flatten(const Signal<D, TInnerSignal> &outer) -> Signal<D, TInnerValue> {
return Signal<D, TInnerValue>(
std::make_shared<
REACT_IMPL::FlattenNode<D, Signal<D, TInnerValue>, TInnerValue>>(
GetNodePtr(outer), GetNodePtr(outer.Value())));
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// VarSignal
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename D, typename S> struct VarSignal : Signal<D, S> {
using NodeT = REACT_IMPL::VarNode<D, S>;
using NodePtrT = std::shared_ptr<NodeT>;
using typename Signal<D, S>::value_type;
explicit VarSignal(NodePtrT nodePtr) : Signal<D, S>{nodePtr} {}
void Set(const value_type &newValue) const {
Signal<D, S>::input_manager().AddInput(var_node(), newValue);
}
void Set(value_type &&newValue) const {
Signal<D, S>::input_manager().AddInput(var_node(), std::move(newValue));
}
const VarSignal &operator<<=(const value_type &newValue) const {
Set(newValue);
return *this;
}
const VarSignal &operator<<=(value_type &&newValue) const {
Set(std::move(newValue));
return *this;
}
template <typename F> void Modify(const F &func) const {
Signal<D, S>::input_manager().ModifyInput(var_node(), func);
}
private:
NodeT &var_node() const {
return *std::static_pointer_cast<NodeT>(this->node_ptr());
}
};
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Comma operator overload to create signal pack from 2 signals.
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename D, typename TLeftVal, typename TRightVal>
auto operator,(const Signal<D, TLeftVal> &a, const Signal<D, TRightVal> &b) {
return SignalPack<Signal<D, TLeftVal>, Signal<D, TRightVal>>{a, b};
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Comma operator overload to append node to existing signal pack.
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename D, typename... TCurSignals, typename TAppendValue>
auto operator,(const SignalPack<TCurSignals...> &cur,
const Signal<D, TAppendValue> &append) {
return SignalPack<TCurSignals..., Signal<D, TAppendValue>>{cur, append};
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// operator->* overload to connect signals to a function and return the
/// resulting signal.
///////////////////////////////////////////////////////////////////////////////////////////////////
// Single arg
template <typename D, typename F, typename TValue>
auto operator->*(const Signal<D, TValue> &arg, F &&func) {
return MakeSignal(arg, std::forward<F>(func));
}
// Multiple args
template <typename F, typename... TValues>
auto operator->*(const SignalPack<TValues...> &argPack, F &&func) {
return MakeSignal(argPack, std::forward<F>(func));
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/// Flatten macros
///////////////////////////////////////////////////////////////////////////////////////////////////
// Note: Using static_cast rather than -> return type, because when using lambda
// for inline
// class initialization, decltype did not recognize the parameter r
// Note2: MSVC doesn't like typename in the lambda
#if _MSC_VER && !__INTEL_COMPILER
#define REACT_MSVC_NO_TYPENAME
#else
#define REACT_MSVC_NO_TYPENAME typename
#endif
#define REACTIVE_REF(obj, name) \
Flatten(MakeSignal( \
obj, [](const REACT_MSVC_NO_TYPENAME REACT_IMPL::Identity<decltype( \
obj)>::Type::ValueT &r) { return r.name; }))
#define REACTIVE_PTR(obj, name) \
Flatten(MakeSignal( \
obj, [](REACT_MSVC_NO_TYPENAME \
REACT_IMPL::Identity<decltype(obj)>::Type::ValueT r) { \
assert(r != nullptr); \
using T = decltype(r->name); \
using S = REACT_MSVC_NO_TYPENAME REACT::DecayInput<T>::Type; \
return static_cast<S>(r->name); \
}))
#endif // REACT_SIGNAL_H_INCLUDED