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 // UNSUPPORTED: c++98, c++03, c++11
10 #include <functional>
11 #include <string>
12 
13 template <class T>
14 struct is_transparent
15 {
16 private:
17     struct two {char lx; char lxx;};
18     template <class U> static two test(...);
19     template <class U> static char test(typename U::is_transparent* = 0);
20 public:
21     static const bool value = sizeof(test<T>(0)) == 1;
22 };
23 
24 
25 int main(int, char**) {
26     static_assert ( !is_transparent<std::bit_and<int>>::value, "" );
27     static_assert ( !is_transparent<std::bit_and<std::string>>::value, "" );
28     static_assert (  is_transparent<std::bit_and<void>>::value, "" );
29     static_assert (  is_transparent<std::bit_and<>>::value, "" );
30 
31     static_assert ( !is_transparent<std::bit_or<int>>::value, "" );
32     static_assert ( !is_transparent<std::bit_or<std::string>>::value, "" );
33     static_assert (  is_transparent<std::bit_or<void>>::value, "" );
34     static_assert (  is_transparent<std::bit_or<>>::value, "" );
35 
36     static_assert ( !is_transparent<std::bit_xor<int>>::value, "" );
37     static_assert ( !is_transparent<std::bit_xor<std::string>>::value, "" );
38     static_assert (  is_transparent<std::bit_xor<void>>::value, "" );
39     static_assert (  is_transparent<std::bit_xor<>>::value, "" );
40 
41     static_assert ( !is_transparent<std::bit_not<int>>::value, "" );
42     static_assert ( !is_transparent<std::bit_not<std::string>>::value, "" );
43     static_assert (  is_transparent<std::bit_not<void>>::value, "" );
44     static_assert (  is_transparent<std::bit_not<>>::value, "" );
45 
46     return 0;
47 }
48