| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <functional> |
| |
| // template <class T> |
| // struct hash |
| // : public unary_function<T, size_t> |
| // { |
| // size_t operator()(T val) const; |
| // }; |
| |
| // Not very portable |
| |
| #include <functional> |
| #include <cassert> |
| #include <type_traits> |
| #include <limits> |
| |
| template <class T> |
| void |
| test() |
| { |
| static_assert((std::is_base_of<std::unary_function<T, std::size_t>, |
| std::hash<T> >::value), ""); |
| std::hash<T> h; |
| typedef typename std::remove_pointer<T>::type type; |
| type i; |
| type j; |
| assert(h(&i) != h(&j)); |
| } |
| |
| int main() |
| { |
| test<int*>(); |
| } |