| Marshall Clow | 75f9aa9 | 2013-08-13 01:12:41 +0000 | [diff] [blame] | 1 | #include <functional> |
| 2 | #include <string> |
| 3 | |
| 4 | template <class _Tp> |
| 5 | struct is_transparent |
| 6 | { |
| 7 | private: |
| 8 | struct __two {char __lx; char __lxx;}; |
| 9 | template <class _Up> static __two __test(...); |
| 10 | template <class _Up> static char __test(typename _Up::is_transparent* = 0); |
| 11 | public: |
| 12 | static const bool value = sizeof(__test<_Tp>(0)) == 1; |
| 13 | }; |
| 14 | |
| 15 | |
| 16 | int main () { |
| 17 | #if _LIBCPP_STD_VER > 11 |
| 18 | |
| 19 | static_assert ( !is_transparent<std::less<int>>::value, "" ); |
| 20 | static_assert ( !is_transparent<std::less<std::string>>::value, "" ); |
| 21 | static_assert ( is_transparent<std::less<void>>::value, "" ); |
| 22 | static_assert ( is_transparent<std::less<>>::value, "" ); |
| 23 | |
| 24 | static_assert ( !is_transparent<std::less_equal<int>>::value, "" ); |
| 25 | static_assert ( !is_transparent<std::less_equal<std::string>>::value, "" ); |
| 26 | static_assert ( is_transparent<std::less_equal<void>>::value, "" ); |
| 27 | static_assert ( is_transparent<std::less_equal<>>::value, "" ); |
| 28 | |
| 29 | static_assert ( !is_transparent<std::equal_to<int>>::value, "" ); |
| 30 | static_assert ( !is_transparent<std::equal_to<std::string>>::value, "" ); |
| 31 | static_assert ( is_transparent<std::equal_to<void>>::value, "" ); |
| 32 | static_assert ( is_transparent<std::equal_to<>>::value, "" ); |
| 33 | |
| 34 | static_assert ( !is_transparent<std::not_equal_to<int>>::value, "" ); |
| 35 | static_assert ( !is_transparent<std::not_equal_to<std::string>>::value, "" ); |
| 36 | static_assert ( is_transparent<std::not_equal_to<void>>::value, "" ); |
| 37 | static_assert ( is_transparent<std::not_equal_to<>>::value, "" ); |
| 38 | |
| 39 | static_assert ( !is_transparent<std::greater<int>>::value, "" ); |
| 40 | static_assert ( !is_transparent<std::greater<std::string>>::value, "" ); |
| 41 | static_assert ( is_transparent<std::greater<void>>::value, "" ); |
| 42 | static_assert ( is_transparent<std::greater<>>::value, "" ); |
| 43 | |
| 44 | static_assert ( !is_transparent<std::greater_equal<int>>::value, "" ); |
| 45 | static_assert ( !is_transparent<std::greater_equal<std::string>>::value, "" ); |
| 46 | static_assert ( is_transparent<std::greater_equal<void>>::value, "" ); |
| 47 | static_assert ( is_transparent<std::greater_equal<>>::value, "" ); |
| 48 | |
| 49 | #endif |
| 50 | |
| 51 | return 0; |
| 52 | } |