| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // { |
| // static pointer pointer_to(<details>); |
| // ... |
| // }; |
| |
| #include <memory> |
| #include <cassert> |
| |
| template <class T> |
| struct A |
| { |
| private: |
| struct nat {}; |
| public: |
| typedef T element_type; |
| element_type* t_; |
| |
| A(element_type* t) : t_(t) {} |
| |
| static A pointer_to(typename std::conditional<std::is_void<element_type>::value, |
| nat, element_type>::type& et) |
| {return A(&et);} |
| }; |
| |
| int main() |
| { |
| { |
| int i = 0; |
| A<int> a = std::pointer_traits<A<int> >::pointer_to(i); |
| assert(a.t_ == &i); |
| } |
| { |
| (std::pointer_traits<A<void> >::element_type)0; |
| } |
| } |