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[PATCH] Implement std::common_reference for C++20

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: Tue, 10 Sep 2019 17:30:00 +0100
Subject: [PATCH] Implement std::common_reference for C++20

	* include/std/type_traits (__do_common_type_impl): Implement
	additional COND-RES(CREF(D1), CRED(D2)) condition for C++20.
	(basic_common_reference, common_reference, common_reference_t): Define
	for C++20.
	* testsuite/20_util/common_reference/requirements/alias_decl.cc: New
	test.
	* testsuite/20_util/common_reference/requirements/
	explicit_instantiation.cc: New test.
	* testsuite/20_util/common_reference/requirements/typedefs.cc: New
	test.

Tested x86_64-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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