1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <memory> 11 12 // template <class Ptr> 13 // struct pointer_traits 14 // { 15 // template <class U> using rebind = <details>; 16 // ... 17 // }; 18 19 #include <memory> 20 #include <type_traits> 21 22 template <class T> 23 struct A 24 { 25 }; 26 27 template <class T> struct B1 {}; 28 29 template <class T> 30 struct B 31 { 32 #ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES 33 template <class U> using rebind = B1<U>; 34 #else 35 template <class U> struct rebind {typedef B1<U> other;}; 36 #endif 37 }; 38 39 template <class T, class U> 40 struct C 41 { 42 }; 43 44 template <class T, class U> struct D1 {}; 45 46 template <class T, class U> 47 struct D 48 { 49 #ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES 50 template <class V> using rebind = D1<V, U>; 51 #else 52 template <class V> struct rebind {typedef D1<V, U> other;}; 53 #endif 54 }; 55 56 int main() 57 { 58 #ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES 59 static_assert((std::is_same<std::pointer_traits<A<int*> >::rebind<double*>, A<double*> >::value), ""); 60 static_assert((std::is_same<std::pointer_traits<B<int> >::rebind<double>, B1<double> >::value), ""); 61 static_assert((std::is_same<std::pointer_traits<C<char, int> >::rebind<double>, C<double, int> >::value), ""); 62 static_assert((std::is_same<std::pointer_traits<D<char, int> >::rebind<double>, D1<double, int> >::value), ""); 63 #else // _LIBCPP_HAS_NO_TEMPLATE_ALIASES 64 static_assert((std::is_same<std::pointer_traits<A<int*> >::rebind<double*>::other, A<double*> >::value), ""); 65 static_assert((std::is_same<std::pointer_traits<B<int> >::rebind<double>::other, B1<double> >::value), ""); 66 static_assert((std::is_same<std::pointer_traits<C<char, int> >::rebind<double>::other, C<double, int> >::value), ""); 67 static_assert((std::is_same<std::pointer_traits<D<char, int> >::rebind<double>::other, D1<double, int> >::value), ""); 68 #endif // _LIBCPP_HAS_NO_TEMPLATE_ALIASES 69 } 70
