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34#ifndef _GLIBCXX_CISO646
35#define _GLIBCXX_CISO646
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