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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/20_util/optional/swap/1.cc
1 // { dg-do run { target c++17 } }
3 // Copyright (C) 2013-2021 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING3. If not see
18 // <http://www.gnu.org/licenses/>.
21 #include <testsuite_hooks.h>
29 mixin_counter() { ++counter
; }
30 mixin_counter(mixin_counter
const&) { ++counter
; }
31 ~mixin_counter() { --counter
; }
37 struct value_type
: private mixin_counter
39 explicit value_type(int state
) : state(state
) { }
46 swap(value_type
& lhs
, value_type
& rhs
)
50 swap(lhs
.state
, rhs
.state
);
57 using O
= std::optional
<ns::value_type
>;
59 VERIFY( ns::swaps
== 0 );
69 O o
{ std::in_place
, 45 }, p
;
72 VERIFY( p
&& p
->state
== 45 );
76 O o
, p
{ std::in_place
, 45 };
78 VERIFY( o
&& o
->state
== 45 );
83 O o
{ std::in_place
, 167 }, p
{ std::in_place
, 999 };
84 VERIFY( ns::swaps
== 0 );
88 VERIFY( o
&& o
->state
== 999 );
89 VERIFY( p
&& p
->state
== 167 );
90 VERIFY( ns::swaps
== 1 );
93 VERIFY( counter
== 0 );