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