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[PATCH] Implement C++20 constexpr changes to std::pair (P1032R1)

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, 26 Sep 2019 17:07:54 +0100
Subject: [PATCH] Implement C++20 constexpr changes to std::pair (P1032R1)

	* include/bits/stl_pair.h (pair): Add _GLIBCXX20_CONSTEXPR to
	piecewise construction constructor, assignment operators, and swap.
	* include/std/tuple (pair::pair(piecewise_construct_t, tuple, tuple)):
	Add _GLIBCXX20_CONSTEXPR.
	(pair::pair(tuple, tuple, _Index_tuple, _Index_tuple)): Likewise.
	* testsuite/20_util/pair/constexpr_assign.cc: New test.
	* testsuite/20_util/pair/constexpr_swap.cc: New test.

There are still more pieces of P1032R1 that need to be implemented,
including (at least) the std::tuple bits.

Tested x86_64-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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