| // 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> |
| #include <functional> |
| |
| 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_ |