| // Copyright 2020 The Pigweed 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 |
| // |
| // https://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. |
| #pragma once |
| |
| #ifdef __cpp_inline_variables |
| #define PW_INLINE_VARIABLE inline |
| #else |
| #define PW_INLINE_VARIABLE |
| #endif // __cpp_inline_variables |
| |
| // Mark functions as constexpr if the relaxed constexpr rules are supported. |
| #if __cpp_constexpr >= 201304L |
| #define PW_CONSTEXPR_FUNCTION constexpr |
| #else |
| #define PW_CONSTEXPR_FUNCTION |
| #endif // __cpp_constexpr >= 201304L |
| |
| // This is an adapter for supporting static_assert with a single argument in |
| // C++11 or C++14. Macros don't correctly parse commas in template expressions, |
| // so the static_assert arguments are passed to an overloaded C++ function. The |
| // full stringified static_assert arguments are used as the message. |
| #if __cpp_static_assert < 201411L |
| |
| #define static_assert(...) \ |
| static_assert(::pw::polyfill::internal::StaticAssertExpression(__VA_ARGS__), \ |
| #__VA_ARGS__) |
| |
| namespace pw { |
| namespace polyfill { |
| namespace internal { |
| |
| constexpr bool StaticAssertExpression(bool expression) { return expression; } |
| |
| constexpr bool StaticAssertExpression(bool expression, const char*) { |
| return expression; |
| } |
| |
| } // namespace internal |
| } // namespace polyfill |
| } // namespace pw |
| |
| #endif // __cpp_static_assert < 201411L |