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// integral_constant
12
13#include <type_traits>
14#include <cassert>
15
16#include "test_macros.h"
17
18int main(int, char**)
19{
20 typedef std::integral_constant<int, 5> _5;
21 static_assert(_5::value == 5, "");
22 static_assert((std::is_same<_5::value_type, int>::value), "");
23 static_assert((std::is_same<_5::type, _5>::value), "");
24#if TEST_STD_VER >= 11
25 static_assert((_5() == 5), "");
26#endif
27 assert(_5() == 5);
28
29
30#if TEST_STD_VER > 11
31 static_assert ( _5{}() == 5, "" );
32 static_assert ( std::true_type{}(), "" );
33#endif
34
35 static_assert(std::false_type::value == false, "");
36 static_assert((std::is_same<std::false_type::value_type, bool>::value), "");
37 static_assert((std::is_same<std::false_type::type, std::false_type>::value), "");
38
39 static_assert(std::true_type::value == true, "");
40 static_assert((std::is_same<std::true_type::value_type, bool>::value), "");
41 static_assert((std::is_same<std::true_type::type, std::true_type>::value), "");
42
43 std::false_type f1;
44 std::false_type f2 = f1;
45 assert(!f2);
46
47 std::true_type t1;
48 std::true_type t2 = t1;
49 assert(t2);
50
51 return 0;
52}
53

source code of libcxx/test/std/utilities/meta/meta.help/integral_constant.pass.cpp