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
62
63
64
65
|
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <memory>
// template <class T>
// struct pointer_traits<T*>
// {
// static pointer pointer_to(<details>) noexcept; // constexpr in C++20
// ...
// };
#include <memory>
#include <cassert>
#include <type_traits>
#include "test_macros.h"
TEST_CONSTEXPR_CXX20 bool test()
{
// pointer_traits<T*>
{
int i = 0;
static_assert(std::is_same<decltype(std::pointer_traits<int*>::pointer_to(i)), int*>::value, "");
ASSERT_NOEXCEPT(std::pointer_traits<int*>::pointer_to(i));
assert(std::pointer_traits<int*>::pointer_to(i) == &i);
}
// pointer_traits<const T*>
{
int const i = 0;
static_assert(std::is_same<decltype(std::pointer_traits<const int*>::pointer_to(i)), const int*>::value, "");
ASSERT_NOEXCEPT(std::pointer_traits<const int*>::pointer_to(i));
assert(std::pointer_traits<const int*>::pointer_to(i) == &i);
}
// pointer_traits<const T*> with a non-const argument
{
int i = 0;
static_assert(std::is_same<decltype(std::pointer_traits<const int*>::pointer_to(i)), const int*>::value, "");
ASSERT_NOEXCEPT(std::pointer_traits<const int*>::pointer_to(i));
assert(std::pointer_traits<const int*>::pointer_to(i) == &i);
}
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
{
// Check that pointer_traits<void*> is still well-formed, even though it has no pointer_to.
static_assert(std::is_same<std::pointer_traits<void*>::element_type, void>::value, "");
static_assert(std::is_same<std::pointer_traits<const void*>::element_type, const void>::value, "");
static_assert(std::is_same<std::pointer_traits<volatile void*>::element_type, volatile void>::value, "");
}
return 0;
}
|
