1 #include <functional>
2 #include <string>
3 
4 template <class _Tp>
5 struct is_transparent
6 {
7 private:
8     struct __two {char __lx; char __lxx;};
9     template <class _Up> static __two __test(...);
10     template <class _Up> static char __test(typename _Up::is_transparent* = 0);
11 public:
12     static const bool value = sizeof(__test<_Tp>(0)) == 1;
13 };
14 
15 
16 int main () {
17 #if _LIBCPP_STD_VER > 11
18 
19     static_assert ( !is_transparent<std::bit_and<int>>::value, "" );
20     static_assert ( !is_transparent<std::bit_and<std::string>>::value, "" );
21     static_assert (  is_transparent<std::bit_and<void>>::value, "" );
22     static_assert (  is_transparent<std::bit_and<>>::value, "" );
23 
24     static_assert ( !is_transparent<std::bit_or<int>>::value, "" );
25     static_assert ( !is_transparent<std::bit_or<std::string>>::value, "" );
26     static_assert (  is_transparent<std::bit_or<void>>::value, "" );
27     static_assert (  is_transparent<std::bit_or<>>::value, "" );
28 
29     static_assert ( !is_transparent<std::bit_xor<int>>::value, "" );
30     static_assert ( !is_transparent<std::bit_xor<std::string>>::value, "" );
31     static_assert (  is_transparent<std::bit_xor<void>>::value, "" );
32     static_assert (  is_transparent<std::bit_xor<>>::value, "" );
33 
34     static_assert ( !is_transparent<std::bit_not<int>>::value, "" );
35     static_assert ( !is_transparent<std::bit_not<std::string>>::value, "" );
36     static_assert (  is_transparent<std::bit_not<void>>::value, "" );
37     static_assert (  is_transparent<std::bit_not<>>::value, "" );
38 
39 #endif
40 
41     return 0;
42     }
43