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32#ifndef _GLIBCXX_CISO646
33#define _GLIBCXX_CISO646
36#pragma GCC system_header
41#if __cplusplus >= 202002L && ! _GLIBCXX_USE_DEPRECATED
42# error "<ciso646> is not a standard header in C++20, use <version> to detect implementation-specific macros"
43#elif __cplusplus >= 201703L && defined __DEPRECATED
44# pragma GCC diagnostic push
45# pragma GCC diagnostic ignored "-Wc++23-extensions"
46# warning "<ciso646> is deprecated in C++17, use <version> to detect implementation-specific macros"
47# pragma GCC diagnostic pop