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| author | Jonathan Wakely <jwakely@redhat.com> | 2021-05-06 19:14:42 +0100 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2021-05-07 23:45:52 +0100 |
| commit | a87ceadf17b4a899f3e74e2da8b6b209461d2742 (patch) | |
| tree | f8f0207607a553c7387377730fff224eeda5561c /gcc/builtins.c | |
| parent | 7c4c9fcc0de865876fb25fe75f4ed6e143bd48c0 (diff) | |
| download | gcc-a87ceadf17b4a899f3e74e2da8b6b209461d2742.zip gcc-a87ceadf17b4a899f3e74e2da8b6b209461d2742.tar.gz gcc-a87ceadf17b4a899f3e74e2da8b6b209461d2742.tar.bz2 | |
libstdc++: Fix constraints for rvalue stream insertion/extraction
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.
Diffstat (limited to 'gcc/builtins.c')
0 files changed, 0 insertions, 0 deletions