| //===----------------------------------------------------------------------===// |
| // |
| // 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. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <memory> |
| |
| // template <class Ptr> |
| // struct pointer_traits |
| // { |
| // typedef <details> difference_type; |
| // ... |
| // }; |
| |
| #include <memory> |
| #include <type_traits> |
| |
| struct A |
| { |
| typedef short element_type; |
| typedef char difference_type; |
| }; |
| |
| struct B |
| { |
| typedef short element_type; |
| }; |
| |
| template <class T> |
| struct C {}; |
| |
| template <class T> |
| struct D |
| { |
| typedef char difference_type; |
| }; |
| |
| int main() |
| { |
| static_assert((std::is_same<std::pointer_traits<A>::difference_type, char>::value), ""); |
| static_assert((std::is_same<std::pointer_traits<B>::difference_type, std::ptrdiff_t>::value), ""); |
| static_assert((std::is_same<std::pointer_traits<C<double> >::difference_type, std::ptrdiff_t>::value), ""); |
| static_assert((std::is_same<std::pointer_traits<D<int> >::difference_type, char>::value), ""); |
| } |