1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// type_traits
10
11// is_same
12
13#include <type_traits>
14
15#include "test_macros.h"
16
17template <class T, class U>
18void test_is_same()
19{
20 static_assert(( std::is_same<T, U>::value), "");
21 static_assert((!std::is_same<const T, U>::value), "");
22 static_assert((!std::is_same<T, const U>::value), "");
23 static_assert(( std::is_same<const T, const U>::value), "");
24#if TEST_STD_VER > 14
25 static_assert(( std::is_same_v<T, U>), "");
26 static_assert((!std::is_same_v<const T, U>), "");
27 static_assert((!std::is_same_v<T, const U>), "");
28 static_assert(( std::is_same_v<const T, const U>), "");
29#endif
30}
31
32template <class T, class U>
33void test_is_same_ref()
34{
35 static_assert((std::is_same<T, U>::value), "");
36 static_assert((std::is_same<const T, U>::value), "");
37 static_assert((std::is_same<T, const U>::value), "");
38 static_assert((std::is_same<const T, const U>::value), "");
39#if TEST_STD_VER > 14
40 static_assert((std::is_same_v<T, U>), "");
41 static_assert((std::is_same_v<const T, U>), "");
42 static_assert((std::is_same_v<T, const U>), "");
43 static_assert((std::is_same_v<const T, const U>), "");
44#endif
45}
46
47template <class T, class U>
48void test_is_not_same()
49{
50 static_assert((!std::is_same<T, U>::value), "");
51}
52
53template <class T>
54struct OverloadTest
55{
56 void fn(std::is_same<T, int>) { }
57 void fn(std::false_type) { }
58 void x() { fn(std::false_type()); }
59};
60
61class Class
62{
63public:
64 ~Class();
65};
66
67int main(int, char**)
68{
69 test_is_same<int, int>();
70 test_is_same<void, void>();
71 test_is_same<Class, Class>();
72 test_is_same<int*, int*>();
73 test_is_same_ref<int&, int&>();
74
75 test_is_not_same<int, void>();
76 test_is_not_same<void, Class>();
77 test_is_not_same<Class, int*>();
78 test_is_not_same<int*, int&>();
79 test_is_not_same<int&, int>();
80
81 OverloadTest<char> t;
82 (void)t;
83
84 return 0;
85}
86

source code of libcxx/test/std/utilities/meta/meta.rel/is_same.pass.cpp