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// Copyright 2022 The Tint Authors.
//
// 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
//
// http://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.
#ifndef SRC_TINT_OVERRIDE_ID_H_
#define SRC_TINT_OVERRIDE_ID_H_
#include <stdint.h>
namespace tint {
/// OverrideId is a numerical identifier for an override variable, unique per program.
struct OverrideId {
uint16_t value = 0;
};
/// Equality operator for OverrideId
/// @param lhs the OverrideId on the left of the '=' operator
/// @param rhs the OverrideId on the right of the '=' operator
/// @returns true if `lhs` is equal to `rhs`
inline bool operator==(OverrideId lhs, OverrideId rhs) {
return lhs.value == rhs.value;
}
/// Less-than operator for OverrideId
/// @param lhs the OverrideId on the left of the '<' operator
/// @param rhs the OverrideId on the right of the '<' operator
/// @returns true if `lhs` comes before `rhs`
inline bool operator<(OverrideId lhs, OverrideId rhs) {
return lhs.value < rhs.value;
}
} // namespace tint
namespace std {
/// Custom std::hash specialization for tint::OverrideId.
template <>
class hash<tint::OverrideId> {
public:
/// @param id the override identifier
/// @return the hash of the override identifier
inline std::size_t operator()(tint::OverrideId id) const {
return std::hash<decltype(tint::OverrideId::value)>()(id.value);
}
};
} // namespace std
#endif // SRC_TINT_OVERRIDE_ID_H_