Go to the documentation of this file. 34 #ifndef _GLIBCXX_CISO646 35 #define _GLIBCXX_CISO646 37 #ifdef _GLIBCXX_SYSHDR 38 #pragma GCC system_header 43 #if __cplusplus >= 202002L 44 # if ! _GLIBCXX_USE_DEPRECATED 45 # error "<ciso646> is not a standard header since C++20, use <version> to detect implementation-specific macros" 46 # elif defined __DEPRECATED 47 # pragma GCC diagnostic push 48 # pragma GCC diagnostic ignored "-Wc++23-extensions" 49 # warning "<ciso646> is not a standard header since C++20, use <version> to detect implementation-specific macros" 50 # pragma GCC diagnostic pop