1 // Copyright 2020 The Pigweed Authors
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
7 // https://www.apache.org/licenses/LICENSE-2.0
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
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.
20 #ifdef __cpp_inline_variables
21 #define PW_INLINE_VARIABLE inline
23 #define PW_INLINE_VARIABLE
24 #endif // __cpp_inline_variables
26 // Mark functions as constexpr if the relaxed constexpr rules are supported.
27 #if __cpp_constexpr >= 201304L
28 #define PW_CONSTEXPR_FUNCTION constexpr
30 #define PW_CONSTEXPR_FUNCTION
31 #endif // __cpp_constexpr >= 201304L