transparent.pass.cpp (1633B)
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 11 #include <functional> 12 #include <string> 13 14 template <class T> 15 struct is_transparent 16 { 17 private: 18 struct two {char lx; char lxx;}; 19 template <class U> static two test(...); 20 template <class U> static char test(typename U::is_transparent* = 0); 21 public: 22 static const bool value = sizeof(test<T>(0)) == 1; 23 }; 24 25 26 int main () 27 { 28 static_assert ( !is_transparent<std::logical_and<int>>::value, "" ); 29 static_assert ( !is_transparent<std::logical_and<std::string>>::value, "" ); 30 static_assert ( is_transparent<std::logical_and<void>>::value, "" ); 31 static_assert ( is_transparent<std::logical_and<>>::value, "" ); 32 33 static_assert ( !is_transparent<std::logical_or<int>>::value, "" ); 34 static_assert ( !is_transparent<std::logical_or<std::string>>::value, "" ); 35 static_assert ( is_transparent<std::logical_or<void>>::value, "" ); 36 static_assert ( is_transparent<std::logical_or<>>::value, "" ); 37 38 static_assert ( !is_transparent<std::logical_not<int>>::value, "" ); 39 static_assert ( !is_transparent<std::logical_not<std::string>>::value, "" ); 40 static_assert ( is_transparent<std::logical_not<void>>::value, "" ); 41 static_assert ( is_transparent<std::logical_not<>>::value, "" ); 42 43 return 0; 44 }