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Move comparison object in map/set move assignment

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* include/bits/stl_tree.h (_Rb_tree::operator=(_Rb_tree&&)): Move
	comparison object.
	* testsuite/23_containers/set/move_comparison.cc: New test.

From-SVN: r239897
This commit is contained in:
Jonathan Wakely 2016-08-31 17:57:14 +01:00 committed by Jonathan Wakely
parent 3625264fb3
commit e46d22a821
3 changed files with 63 additions and 1 deletions
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4
libstdc++-v3/ChangeLog
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@ -1,5 +1,9 @@
2016-08-31 Jonathan Wakely <jwakely@redhat.com>
* include/bits/stl_tree.h (_Rb_tree::operator=(_Rb_tree&&)): Move
comparison object.
* testsuite/23_containers/set/move_comparison.cc: New test.
* testsuite/20_util/enable_shared_from_this/members/weak_from_this.cc:
New test.

2
libstdc++-v3/include/bits/stl_tree.h
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@ -1436,7 +1436,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
noexcept(_Alloc_traits::_S_nothrow_move()
&& is_nothrow_move_assignable<_Compare>::value)
{
_M_impl._M_key_compare = __x._M_impl._M_key_compare;
_M_impl._M_key_compare = std::move(__x._M_impl._M_key_compare);
constexpr bool __move_storage =
_Alloc_traits::_S_propagate_on_move_assign()
|| _Alloc_traits::_S_always_equal();

58
libstdc++-v3/testsuite/23_containers/set/move_comparison.cc Normal file
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@ -0,0 +1,58 @@
// Copyright (C) 2016 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-do run { target c++11 } }
#include <set>
#include <testsuite_allocator.h>
#include <testsuite_hooks.h>
struct Cmp
{
Cmp() = default;
Cmp(const Cmp&) = default;
Cmp(Cmp&&) = default;
Cmp& operator=(const Cmp&) = default;
Cmp& operator=(Cmp&& c) { c.moved_from = true; return *this; }
bool moved_from = false;
bool operator()(int l, int r) const
{
VERIFY(!moved_from);
return l < r;
}
};
void
test01()
{
using allocator = __gnu_test::uneq_allocator<int>;
using test_type = std::set<int, Cmp, allocator>;
test_type s1(allocator(1)), s2(allocator(2));
s1.insert(1);
s1.insert(2);
s1.insert(3);
s2 = std::move(s1);
VERIFY(s1.key_comp().moved_from);
}
int
main()
{
test01();
}