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Guard use of concepts with feature test macro

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This fixes a regression when using Clang.

	* include/bits/range_cmp.h: Check __cpp_lib_concepts before defining
	concepts. Fix comment.

From-SVN: r277449
This commit is contained in:
Jonathan Wakely 2019-10-25 14:29:37 +01:00 committed by Jonathan Wakely
parent 7098ab48b0
commit f4568f030e
2 changed files with 8 additions and 1 deletions
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5
libstdc++-v3/ChangeLog
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@ -1,3 +1,8 @@
2019-10-25 Jonathan Wakely <jwakely@redhat.com>
* include/bits/range_cmp.h: Check __cpp_lib_concepts before defining
concepts. Fix comment.
2019-10-25 Gerald Pfeifer <gerald@pfeifer.com>
* doc/xml/manual/policy_data_structures_biblio.xml: Switch

4
libstdc++-v3/include/bits/range_cmp.h
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@ -22,7 +22,7 @@
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file bits/ranges_function.h
/** @file bits/range_cmp.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{functional}
*/
@ -54,6 +54,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
using is_transparent = __is_transparent;
};
#ifdef __cpp_lib_concepts
namespace ranges
{
namespace __detail
@ -182,6 +183,7 @@ namespace ranges
};
} // namespace ranges
#endif // library concepts
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++20