a87ceadf17
The __rval_streamable() function was an attempt to test for convertibility cheaply and without confusing diagnostics. It doesn't work with Clang though, and is probably ill-formed. Replace that helper function with a check for derivation from ios_base, and use that in the alias templates __rvalue_stream_insertion_t and __rvalue_stream_extraction_t. Use concepts for the constraints when available. libstdc++-v3/ChangeLog: * include/std/istream (__rvalue_stream_extraction_t): Replace use of __rval_streamable. * include/std/ostream (__rvalue_stream_insertion_t): Likewise. (__rval_streamable): Remove. (_Require_derived_from_ios_base, __derived_from_ios_base): New helper for checking constraints. * testsuite/27_io/basic_istream/extractors_other/char/4.cc: Fix reference to the wrong subclause of the standard. * testsuite/27_io/basic_istream/extractors_other/wchar_t/4.cc: Likewise. * testsuite/27_io/basic_ostream/inserters_other/char/6.cc: Likewise. * testsuite/27_io/basic_ostream/inserters_other/wchar_t/6.cc: Likewise. * testsuite/27_io/basic_ostream/inserters_other/char/99692.cc: New test. * testsuite/27_io/filesystem/path/io/dr2989.cc: Adjust pruned errors. |
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