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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/20_util/optional/in_place.cc
1 // { dg-options "-std=gnu++17" }
2 // { dg-do run { target c++17 } }
4 // Copyright (C) 2013-2021 Free Software Foundation, Inc.
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 3, or (at your option)
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License along
18 // with this library; see the file COPYING3. If not see
19 // <http://www.gnu.org/licenses/>.
22 #include <testsuite_hooks.h>
28 // [20.5.5] In-place construction
30 std::optional
<int> o
{ std::in_place
};
32 VERIFY( *o
== int() );
34 static_assert( !std::is_convertible
<std::in_place_t
, std::optional
<int>>(), "" );
38 std::optional
<int> o
{ std::in_place
, 42 };
44 std::optional
<std::vector
<int>> o
{ std::in_place
, 18, 4 };
46 VERIFY( o
->size() == 18 );
47 VERIFY( (*o
)[17] == 4 );
51 std::optional
<std::vector
<int>> o
{ std::in_place
, { 18, 4 } };
53 VERIFY( o
->size() == 2 );
54 VERIFY( (*o
)[0] == 18 );
58 std::optional
<std::vector
<int>> o
{ std::in_place
, { 18, 4 }, std::allocator
<int> {} };
60 VERIFY( o
->size() == 2 );
61 VERIFY( (*o
)[0] == 18 );