libcxx/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp

   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++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
  27 int main(int, char**) {
  28     static_assert ( !is_transparent<std::bit_and<int>>::value, "" );
  29     static_assert ( !is_transparent<std::bit_and<std::string>>::value, "" );
  30     static_assert (  is_transparent<std::bit_and<void>>::value, "" );
  31     static_assert (  is_transparent<std::bit_and<>>::value, "" );
  32
  33     static_assert ( !is_transparent<std::bit_or<int>>::value, "" );
  34     static_assert ( !is_transparent<std::bit_or<std::string>>::value, "" );
  35     static_assert (  is_transparent<std::bit_or<void>>::value, "" );
  36     static_assert (  is_transparent<std::bit_or<>>::value, "" );
  37
  38     static_assert ( !is_transparent<std::bit_xor<int>>::value, "" );
  39     static_assert ( !is_transparent<std::bit_xor<std::string>>::value, "" );
  40     static_assert (  is_transparent<std::bit_xor<void>>::value, "" );
  41     static_assert (  is_transparent<std::bit_xor<>>::value, "" );
  42
  43     static_assert ( !is_transparent<std::bit_not<int>>::value, "" );
  44     static_assert ( !is_transparent<std::bit_not<std::string>>::value, "" );
  45     static_assert (  is_transparent<std::bit_not<void>>::value, "" );
  46     static_assert (  is_transparent<std::bit_not<>>::value, "" );
  47
  48     return 0;
  49 }