| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <memory> |
| |
| // template <class Ptr> |
| // struct pointer_traits |
| // { |
| // typedef <details> difference_type; |
| // ... |
| // }; |
| |
| #include <memory> |
| #include <type_traits> |
| |
| #include "test_macros.h" |
| |
| 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; |
| }; |
| |
| template <class T> |
| struct E |
| { |
| static int difference_type; |
| }; |
| |
| template <class T> |
| struct F { |
| private: |
| typedef int difference_type; |
| }; |
| |
| int main(int, char**) |
| { |
| 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), ""); |
| static_assert((std::is_same<std::pointer_traits<E<int> >::difference_type, std::ptrdiff_t>::value), ""); |
| #if TEST_STD_VER >= 11 |
| static_assert((std::is_same<std::pointer_traits<F<int>>::difference_type, std::ptrdiff_t>::value), ""); |
| #endif |
| |
| return 0; |
| } |