#ifndef THIRD_PARTY_CEL_CPP_COMMON_UNKNOWN_H_

#define THIRD_PARTY_CEL_CPP_COMMON_UNKNOWN_H_

#include "absl/types/span.h"

#include "common/id.h"

namespace google {

namespace api {

namespace expr {

namespace common {

/** An unknown CEL value. */

class Unknown {

public:

explicit Unknown(Id id);

explicit Unknown(absl::Span<const Id> ids);

const std::set<Id>& ids() const { return ids_; }

inline bool operator==(const Unknown& rhs) const {

return this == &rhs || ids_ == rhs.ids_;

}

inline bool operator!=(const Unknown& rhs) const { return !(*this == rhs); }

/** The hash code for this value. */

std::size_t hash_code() const;

/**

* A string useful for debugging.

*

* Format may change, and computation may be expensive.

*/

std::string ToString() const;

private:

std::set<Id> ids_;

};

inline std::ostream& operator<<(std::ostream& os, const Unknown& value) {

return os << value.ToString();

}

} // namespace common

} // namespace expr

} // namespace api

} // namespace google

#endif // THIRD_PARTY_CEL_CPP_COMMON_UNKNOWN_H_