1 // { dg-options "-std=gnu++1y" }
2 // { dg-do run }
3
4 // Copyright (C) 2013-2014 Free Software Foundation, Inc.
5 //
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)
10 // any later version.
11
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.
16
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/>.
20
21 #include <experimental/optional>
22 #include <testsuite_hooks.h>
23
24 #include <vector>
25
main()26 int main()
27 {
28 // [20.5.5] In-place construction
29 static_assert( std::is_same<decltype(std::experimental::in_place), const std::experimental::in_place_t>(), "" );
30 static_assert( std::is_empty<std::experimental::in_place_t>(), "" );
31
32 {
33 std::experimental::optional<int> o { std::experimental::in_place };
34 VERIFY( o );
35 VERIFY( *o == int() );
36
37 static_assert( !std::is_convertible<std::experimental::in_place_t, std::experimental::optional<int>>(), "" );
38 }
39
40 {
41 std::experimental::optional<int> o { std::experimental::in_place, 42 };
42 VERIFY( o );
43 VERIFY( *o == 42 );
44 }
45
46 {
47 std::experimental::optional<std::vector<int>> o { std::experimental::in_place, 18, 4 };
48 VERIFY( o );
49 VERIFY( o->size() == 18 );
50 VERIFY( (*o)[17] == 4 );
51 }
52
53 {
54 std::experimental::optional<std::vector<int>> o { std::experimental::in_place, { 18, 4 } };
55 VERIFY( o );
56 VERIFY( o->size() == 2 );
57 VERIFY( (*o)[0] == 18 );
58 }
59
60 {
61 std::experimental::optional<std::vector<int>> o { std::experimental::in_place, { 18, 4 }, std::allocator<int> {} };
62 VERIFY( o );
63 VERIFY( o->size() == 2 );
64 VERIFY( (*o)[0] == 18 );
65 }
66 }
67