1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <memory>
11 
12 // template <class T>
13 // struct pointer_traits<T*>
14 // {
15 //     static pointer pointer_to(<details>); // constexpr in C++20
16 //     ...
17 // };
18 
19 #include <memory>
20 #include <cassert>
21 #include "test_macros.h"
22 
23 #if TEST_STD_VER > 17
24 constexpr
25 #endif
check()26 bool check() {
27     {
28         int i = 0;
29         static_assert((std::is_same<int *, decltype(std::pointer_traits<int*>::pointer_to(i))>::value), "");
30         int* a = std::pointer_traits<int*>::pointer_to(i);
31         assert(a == &i);
32     }
33     {
34         (std::pointer_traits<void*>::element_type)0;
35     }
36     return true;
37 }
38 
main()39 int main() {
40     check();
41 #if TEST_STD_VER > 17
42     static_assert(check(), "");
43 #endif
44 }
45