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P0595R2 - is_constant_evaluated * include/bits/c++config (_GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED): Define if __builtin_is_constant_evaluated is available. * include/std/type_traits (std::is_constant_evaluated): New constexpr inline function. * testsuite/20_util/is_constant_evaluated/1.cc: New test. * testsuite/20_util/is_constant_evaluated/noexcept.cc: New test. From-SVN: r267045
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.