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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 // UNSUPPORTED: c++98, c++03, c++11, c++14
11 // type_traits
12 
13 // template<class... B> struct conjunction;                           // C++17
14 // template<class... B>
15 //   constexpr bool conjunction_v = conjunction<B...>::value;         // C++17
16 
17 #include <type_traits>
18 #include <cassert>
19 
20 struct True  { static constexpr bool value = true; };
21 struct False { static constexpr bool value = false; };
22 
main()23 int main()
24 {
25     static_assert ( std::conjunction<>::value, "" );
26     static_assert ( std::conjunction<std::true_type >::value, "" );
27     static_assert (!std::conjunction<std::false_type>::value, "" );
28 
29     static_assert ( std::conjunction_v<>, "" );
30     static_assert ( std::conjunction_v<std::true_type >, "" );
31     static_assert (!std::conjunction_v<std::false_type>, "" );
32 
33     static_assert ( std::conjunction<std::true_type,  std::true_type >::value, "" );
34     static_assert (!std::conjunction<std::true_type,  std::false_type>::value, "" );
35     static_assert (!std::conjunction<std::false_type, std::true_type >::value, "" );
36     static_assert (!std::conjunction<std::false_type, std::false_type>::value, "" );
37 
38     static_assert ( std::conjunction_v<std::true_type,  std::true_type >, "" );
39     static_assert (!std::conjunction_v<std::true_type,  std::false_type>, "" );
40     static_assert (!std::conjunction_v<std::false_type, std::true_type >, "" );
41     static_assert (!std::conjunction_v<std::false_type, std::false_type>, "" );
42 
43     static_assert ( std::conjunction<std::true_type,  std::true_type,  std::true_type >::value, "" );
44     static_assert (!std::conjunction<std::true_type,  std::false_type, std::true_type >::value, "" );
45     static_assert (!std::conjunction<std::false_type, std::true_type,  std::true_type >::value, "" );
46     static_assert (!std::conjunction<std::false_type, std::false_type, std::true_type >::value, "" );
47     static_assert (!std::conjunction<std::true_type,  std::true_type,  std::false_type>::value, "" );
48     static_assert (!std::conjunction<std::true_type,  std::false_type, std::false_type>::value, "" );
49     static_assert (!std::conjunction<std::false_type, std::true_type,  std::false_type>::value, "" );
50     static_assert (!std::conjunction<std::false_type, std::false_type, std::false_type>::value, "" );
51 
52     static_assert ( std::conjunction_v<std::true_type,  std::true_type,  std::true_type >, "" );
53     static_assert (!std::conjunction_v<std::true_type,  std::false_type, std::true_type >, "" );
54     static_assert (!std::conjunction_v<std::false_type, std::true_type,  std::true_type >, "" );
55     static_assert (!std::conjunction_v<std::false_type, std::false_type, std::true_type >, "" );
56     static_assert (!std::conjunction_v<std::true_type,  std::true_type,  std::false_type>, "" );
57     static_assert (!std::conjunction_v<std::true_type,  std::false_type, std::false_type>, "" );
58     static_assert (!std::conjunction_v<std::false_type, std::true_type,  std::false_type>, "" );
59     static_assert (!std::conjunction_v<std::false_type, std::false_type, std::false_type>, "" );
60 
61     static_assert ( std::conjunction<True >::value, "" );
62     static_assert (!std::conjunction<False>::value, "" );
63 
64     static_assert ( std::conjunction_v<True >, "" );
65     static_assert (!std::conjunction_v<False>, "" );
66 }
67