1 // Copyright 2020 The Dawn Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef COMMON_TYPETRAITS_H_ 16 #define COMMON_TYPETRAITS_H_ 17 18 #include <type_traits> 19 20 template <typename LHS, typename RHS = LHS, typename T = void> 21 struct HasEqualityOperator { 22 static constexpr const bool value = false; 23 }; 24 25 template <typename LHS, typename RHS> 26 struct HasEqualityOperator< 27 LHS, 28 RHS, 29 std::enable_if_t< 30 std::is_same<decltype(std::declval<LHS>() == std::declval<RHS>()), bool>::value>> { 31 static constexpr const bool value = true; 32 }; 33 34 #endif // COMMON_TYPE_TRAITS_H_ 35