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 #include <functional> 11 #include <string> 12 13 template <class _Tp> 14 struct is_transparent 15 { 16 private: 17 struct __two {char __lx; char __lxx;}; 18 template <class _Up> static __two __test(...); 19 template <class _Up> static char __test(typename _Up::is_transparent* = 0); 20 public: 21 static const bool value = sizeof(__test<_Tp>(0)) == 1; 22 }; 23 24 25 int main () { 26 #if _LIBCPP_STD_VER > 11 27 28 static_assert ( !is_transparent<std::less<int>>::value, "" ); 29 static_assert ( !is_transparent<std::less<std::string>>::value, "" ); 30 static_assert ( is_transparent<std::less<void>>::value, "" ); 31 static_assert ( is_transparent<std::less<>>::value, "" ); 32 33 static_assert ( !is_transparent<std::less_equal<int>>::value, "" ); 34 static_assert ( !is_transparent<std::less_equal<std::string>>::value, "" ); 35 static_assert ( is_transparent<std::less_equal<void>>::value, "" ); 36 static_assert ( is_transparent<std::less_equal<>>::value, "" ); 37 38 static_assert ( !is_transparent<std::equal_to<int>>::value, "" ); 39 static_assert ( !is_transparent<std::equal_to<std::string>>::value, "" ); 40 static_assert ( is_transparent<std::equal_to<void>>::value, "" ); 41 static_assert ( is_transparent<std::equal_to<>>::value, "" ); 42 43 static_assert ( !is_transparent<std::not_equal_to<int>>::value, "" ); 44 static_assert ( !is_transparent<std::not_equal_to<std::string>>::value, "" ); 45 static_assert ( is_transparent<std::not_equal_to<void>>::value, "" ); 46 static_assert ( is_transparent<std::not_equal_to<>>::value, "" ); 47 48 static_assert ( !is_transparent<std::greater<int>>::value, "" ); 49 static_assert ( !is_transparent<std::greater<std::string>>::value, "" ); 50 static_assert ( is_transparent<std::greater<void>>::value, "" ); 51 static_assert ( is_transparent<std::greater<>>::value, "" ); 52 53 static_assert ( !is_transparent<std::greater_equal<int>>::value, "" ); 54 static_assert ( !is_transparent<std::greater_equal<std::string>>::value, "" ); 55 static_assert ( is_transparent<std::greater_equal<void>>::value, "" ); 56 static_assert ( is_transparent<std::greater_equal<>>::value, "" ); 57 58 #endif 59 60 return 0; 61 } 62
