1 // Copyright 2020 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://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, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 // Macros for adapting to older versions of C++. A few keywords (consteval, 16 // constinit) are handled by pw_polfyill/language_features.h, which is directly 17 // -included by users of pw_polyfill. 18 #pragma once 19 20 #ifdef __cpp_inline_variables 21 #define PW_INLINE_VARIABLE inline 22 #else 23 #define PW_INLINE_VARIABLE 24 #endif // __cpp_inline_variables 25 26 // Mark functions as constexpr if the relaxed constexpr rules are supported. 27 #if __cpp_constexpr >= 201304L 28 #define PW_CONSTEXPR_FUNCTION constexpr 29 #else 30 #define PW_CONSTEXPR_FUNCTION 31 #endif // __cpp_constexpr >= 201304L 32