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Extend __is_convertible_helper to also detect whether the conversion is non-throwing, for std::is_nothrow_convertible in C++2a, * include/std/type_traits [__cplusplus > 201703] (__is_convertible_helper::__is_nothrow_type): Define new member. (__is_convertible_helper<_From, _To, false>::__test_aux1): Add noexcept. (__is_convertible_helper<_From, _To, false>::__test_nothrow) (__is_convertible_helper<_From, _To, false>::__is_nothrow_type): Add new members. (is_nothrow_convertible, is_nothrow_convertible_v): Define for C++2a. * testsuite/20_util/is_nothrow_convertible/value.cc: New. * testsuite/20_util/is_nothrow_convertible/requirements/ explicit_instantiation.cc: New. * testsuite/20_util/is_nothrow_convertible/requirements/typedefs.cc: New. From-SVN: r262322
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.