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[PATCH] libstdc++: Implement new predicate concepts from P1716R3

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Thu, 14 Nov 2019 16:52:56 +0000
Subject: [PATCH] libstdc++: Implement new predicate concepts from P1716R3

	* include/bits/iterator_concepts.h (__iter_concept_impl): Add
	comments.
	(indirect_relation): Rename to indirect_binary_predicate and adjust
	definition as per P1716R3.
	(indirect_equivalence_relation): Define.
	(indirectly_comparable): Adjust definition.
	* include/std/concepts (equivalence_relation): Define.
	* testsuite/std/concepts/concepts.callable/relation.cc: Add tests for
	equivalence_relation.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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