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
50
51
52
53
54
55
56
57
58
59
60
61
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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
// REQUIRES: c++experimental
// <experimental/memory>
// observer_ptr
//
// constexpr void reset(element_type* p = nullptr) noexcept;
#include <experimental/memory>
#include <type_traits>
#include <cassert>
template <class T, class Object = T>
constexpr void test_reset() {
using Ptr = std::experimental::observer_ptr<T>;
Object obj1, obj2;
{
Ptr ptr(&obj1);
assert(ptr.get() == &obj1);
ptr.reset(&obj2);
assert(ptr.get() == &obj2);
static_assert(noexcept(ptr.reset(&obj2)));
static_assert(std::is_same<decltype(ptr.reset(&obj2)), void>::value);
}
{
Ptr ptr(&obj1);
assert(ptr.get() == &obj1);
ptr.reset();
assert(ptr.get() == nullptr);
static_assert(noexcept(ptr.reset()));
static_assert(std::is_same<decltype(ptr.reset()), void>::value);
}
}
struct Bar {};
constexpr bool test() {
test_reset<Bar>();
test_reset<int>();
test_reset<void, int>();
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
|
