r276154 - in /trunk/libstdc++-v3: ChangeLog inc...

[redi@gcc.gnu.org]

Author: redi
Date: Thu Sep 26 16:08:39 2019
New Revision: 276154

URL: https://gcc.gnu.org/viewcvs?rev=276154&root=gcc&view=rev
Log:
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.

Added:
    trunk/libstdc++-v3/testsuite/20_util/pair/constexpr_assign.cc
    trunk/libstdc++-v3/testsuite/20_util/pair/constexpr_swap.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/stl_pair.h
    trunk/libstdc++-v3/include/std/tuple