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libstdc++: Adjust feature test in <istream> and <ostream>

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We don't need any library concepts to define the constraints for rvalue
stream overloads, only compiler support. So change the test from using
__cpp_lib_concepts to __cpp_concepts >= 201907L.

libstdc++-v3/ChangeLog:

	* include/std/istream (__rvalue_stream_extraction_t): Test
	__cpp_concepts instead of __cpp_lib_concepts.
	* include/std/ostream (__derived_from_ios_base): Likewise.
	(__rvalue_stream_insertion_t): Likewise.
This commit is contained in:
Jonathan Wakely 2023-11-14 15:48:03 +00:00
parent f158bd511d
commit 17aca35c0e
2 changed files with 2 additions and 2 deletions
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2
libstdc++-v3/include/std/istream
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@ -1069,7 +1069,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// 2328. Rvalue stream extraction should use perfect forwarding
// 1203. More useful rvalue stream insertion
#if __cpp_lib_concepts
#if __cpp_concepts >= 201907L
template<typename _Is, typename _Tp>
requires __derived_from_ios_base<_Is>
&& requires (_Is& __is, _Tp&& __t) { __is >> std::forward<_Tp>(__t); }

2
libstdc++-v3/include/std/ostream
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@ -763,7 +763,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 1203. More useful rvalue stream insertion
#if __cpp_lib_concepts
#if __cpp_concepts >= 201907L
// Use concepts if possible because they're cheaper to evaluate.
template<typename _Tp>
concept __derived_from_ios_base = is_class_v<_Tp>