1c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant//===----------------------------------------------------------------------===// 2c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 3c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// The LLVM Compiler Infrastructure 4c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 5b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// This file is dual licensed under the MIT and the University of Illinois Open 6b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// Source Licenses. See LICENSE.TXT for details. 7c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 8c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant//===----------------------------------------------------------------------===// 9c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 10c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// <memory> 11c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 12c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// template <class Ptr> 13c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// struct pointer_traits 14c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// { 15c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// static pointer pointer_to(<details>); 16c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// ... 17c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// }; 18c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 19c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant#include <memory> 20c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant#include <cassert> 21c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 22c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnanttemplate <class T> 23c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantstruct A 24c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant{ 25c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantprivate: 26c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant struct nat {}; 27c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantpublic: 28c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant typedef T element_type; 29c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant element_type* t_; 30c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 31c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A(element_type* t) : t_(t) {} 32c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 33c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant static A pointer_to(typename std::conditional<std::is_void<element_type>::value, 34c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant nat, element_type>::type& et) 35c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant {return A(&et);} 36c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant}; 37c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 38c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantint main() 39c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant{ 40c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 41c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant int i = 0; 42c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A<int> a = std::pointer_traits<A<int> >::pointer_to(i); 43c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(a.t_ = &i); 44c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 45c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 46c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant (std::pointer_traits<A<void> >::element_type)0; 47c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 48c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant} 49