1 // Copyright 2024 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 #pragma once 15 16 // Provide static_assert as a macro before C23. 17 #if !defined(__cplusplus) && __STDC_VERSION__ < 202311L 18 19 #undef static_assert // Undefine the macro in case <assert.h> is included. 20 21 // Define static_assert to support an optional message argument, as in C23. 22 #define static_assert(expression, ...) \ 23 _Static_assert(expression, "(" #expression ") " __VA_ARGS__) 24 25 // _Static_assert was not added until C11, but modern compilers support it for 26 // all C standards. GCC has supported it since 4.6, for example. 27 28 #endif // !defined(__cplusplus) && __STDC_VERSION__ < 202311L 29