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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/20_util/optional/in_place.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>
27 // [20.5.5] In-place construction
29 std::optional
<int> o
{ std::in_place
};
31 VERIFY( *o
== int() );
33 static_assert( !std::is_convertible
<std::in_place_t
, std::optional
<int>>(), "" );
37 std::optional
<int> o
{ std::in_place
, 42 };
43 std::optional
<std::vector
<int>> o
{ std::in_place
, 18, 4 };
45 VERIFY( o
->size() == 18 );
46 VERIFY( (*o
)[17] == 4 );
50 std::optional
<std::vector
<int>> o
{ std::in_place
, { 18, 4 } };
52 VERIFY( o
->size() == 2 );
53 VERIFY( (*o
)[0] == 18 );
57 std::optional
<std::vector
<int>> o
{ std::in_place
, { 18, 4 }, std::allocator
<int> {} };
59 VERIFY( o
->size() == 2 );
60 VERIFY( (*o
)[0] == 18 );