blob: cc56701e95d2aafcef89e6131b34d44fa5afb8d3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
// Copyright (C) 2017-2018 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-options "-std=gnu++17" }
// { dg-do compile { target c++17 } }
#include <optional>
#include <type_traits>
struct MoveOnly
{
MoveOnly() = default;
MoveOnly(MoveOnly&&);
MoveOnly& operator=(MoveOnly&&);
};
int main()
{
std::optional x = 5;
static_assert(std::is_same_v<decltype(x), std::optional<int>>);
int y = 42;
std::optional x2 = y;
static_assert(std::is_same_v<decltype(x2), std::optional<int>>);
const int z = 666;
std::optional x3 = z;
static_assert(std::is_same_v<decltype(x3), std::optional<int>>);
std::optional mo = MoveOnly();
static_assert(std::is_same_v<decltype(mo), std::optional<MoveOnly>>);
mo = MoveOnly();
std::optional copy = x;
static_assert(std::is_same_v<decltype(copy), std::optional<int>>);
std::optional move = std::move(mo);
static_assert(std::is_same_v<decltype(move), std::optional<MoveOnly>>);
}
|
