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 #include "test_macros.h"
14
15 template <class T>
16 struct is_transparent
17 {
18 private:
19 struct two {char lx; char lxx;};
20 template <class U> static two test(...);
21 template <class U> static char test(typename U::is_transparent* = 0);
22 public:
23 static const bool value = sizeof(test<T>(0)) == 1;
24 };
25
26
main(int,char **)27 int main(int, char**)
28 {
29 static_assert ( !is_transparent<std::plus<int>>::value, "" );
30 static_assert ( !is_transparent<std::plus<std::string>>::value, "" );
31 static_assert ( is_transparent<std::plus<void>>::value, "" );
32 static_assert ( is_transparent<std::plus<>>::value, "" );
33
34 static_assert ( !is_transparent<std::minus<int>>::value, "" );
35 static_assert ( !is_transparent<std::minus<std::string>>::value, "" );
36 static_assert ( is_transparent<std::minus<void>>::value, "" );
37 static_assert ( is_transparent<std::minus<>>::value, "" );
38
39 static_assert ( !is_transparent<std::multiplies<int>>::value, "" );
40 static_assert ( !is_transparent<std::multiplies<std::string>>::value, "" );
41 static_assert ( is_transparent<std::multiplies<void>>::value, "" );
42 static_assert ( is_transparent<std::multiplies<>>::value, "" );
43
44 static_assert ( !is_transparent<std::divides<int>>::value, "" );
45 static_assert ( !is_transparent<std::divides<std::string>>::value, "" );
46 static_assert ( is_transparent<std::divides<void>>::value, "" );
47 static_assert ( is_transparent<std::divides<>>::value, "" );
48
49 static_assert ( !is_transparent<std::modulus<int>>::value, "" );
50 static_assert ( !is_transparent<std::modulus<std::string>>::value, "" );
51 static_assert ( is_transparent<std::modulus<void>>::value, "" );
52 static_assert ( is_transparent<std::modulus<>>::value, "" );
53
54 static_assert ( !is_transparent<std::negate<int>>::value, "" );
55 static_assert ( !is_transparent<std::negate<std::string>>::value, "" );
56 static_assert ( is_transparent<std::negate<void>>::value, "" );
57 static_assert ( is_transparent<std::negate<>>::value, "" );
58
59 return 0;
60 }
61