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// To detect the standard library we need to include a certain header first.
//
#if defined(__clang__)
# if __has_include(<__config>) // libc++ _LIBCPP_VERSION
# include <__config>
# elif __has_include(<bits/c++config.h>) // libstdc++ __GLIBCXX__
# include <bits/c++config.h>
# endif
#elif defined(__GNUC__)
# include <bits/c++config.h> // libstdc++ __GLIBCXX__
#endif
#if !defined(_MSC_VER) && !defined(__GLIBCXX__) && !defined(_LIBCPP_VERSION)
# error unknown standard library implementation
#endif
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