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
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
// <optional>
// template <class T, class... Args>
// constexpr optional<T> make_optional(Args&&... args);
#include <optional>
#include <string>
#include <memory>
#include <cassert>
#include "test_macros.h"
int main(int, char**)
{
using std::optional;
using std::make_optional;
{
constexpr auto opt = make_optional<int>('a');
static_assert(*opt == int('a'), "");
}
{
std::string s("123");
auto opt = make_optional<std::string>(s);
assert(*opt == s);
}
{
std::unique_ptr<int> s(new int(3));
auto opt = make_optional<std::unique_ptr<int>>(std::move(s));
assert(**opt == 3);
assert(s == nullptr);
}
{
auto opt = make_optional<std::string>(4u, 'X');
assert(*opt == "XXXX");
}
return 0;
}
|
