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 Alloc> 13 // struct allocator_traits 14 // { 15 // template <class T> using rebind_alloc = Alloc::rebind<U>::other | Alloc<T, Args...>; 16 // ... 17 // }; 18 19 #include <memory> 20 #include <type_traits> 21 22 #include "test_macros.h" 23 24 template <class T> 25 struct ReboundA {}; 26 27 template <class T> 28 struct A 29 { 30 typedef T value_type; 31 32 template <class U> struct rebind {typedef ReboundA<U> other;}; 33 }; 34 35 template <class T, class U> 36 struct ReboundB {}; 37 38 template <class T, class U> 39 struct B 40 { 41 typedef T value_type; 42 43 template <class V> struct rebind {typedef ReboundB<V, U> other;}; 44 }; 45 46 template <class T> 47 struct C 48 { 49 typedef T value_type; 50 }; 51 52 template <class T, class U> 53 struct D 54 { 55 typedef T value_type; 56 }; 57 58 template <class T> 59 struct E 60 { 61 typedef T value_type; 62 63 template <class U> struct rebind {typedef ReboundA<U> otter;}; 64 }; 65 66 template <class T> 67 struct F { 68 typedef T value_type; 69 private: 70 template <class> 71 struct rebind { typedef void other; }; 72 }; 73 74 template <class T> 75 struct G { 76 typedef T value_type; 77 template <class> 78 struct rebind { 79 private: 80 typedef void other; 81 }; 82 }; 83 84 int main() 85 { 86 #if TEST_STD_VER >= 11 87 static_assert((std::is_same<std::allocator_traits<A<char> >::rebind_alloc<double>, ReboundA<double> >::value), ""); 88 static_assert((std::is_same<std::allocator_traits<B<int, char> >::rebind_alloc<double>, ReboundB<double, char> >::value), ""); 89 static_assert((std::is_same<std::allocator_traits<C<char> >::rebind_alloc<double>, C<double> >::value), ""); 90 static_assert((std::is_same<std::allocator_traits<D<int, char> >::rebind_alloc<double>, D<double, char> >::value), ""); 91 static_assert((std::is_same<std::allocator_traits<E<char> >::rebind_alloc<double>, E<double> >::value), ""); 92 static_assert((std::is_same<std::allocator_traits<F<char> >::rebind_alloc<double>, F<double> >::value), ""); 93 static_assert((std::is_same<std::allocator_traits<G<char> >::rebind_alloc<double>, G<double> >::value), ""); 94 #else 95 static_assert((std::is_same<std::allocator_traits<A<char> >::rebind_alloc<double>::other, ReboundA<double> >::value), ""); 96 static_assert((std::is_same<std::allocator_traits<B<int, char> >::rebind_alloc<double>::other, ReboundB<double, char> >::value), ""); 97 static_assert((std::is_same<std::allocator_traits<C<char> >::rebind_alloc<double>::other, C<double> >::value), ""); 98 static_assert((std::is_same<std::allocator_traits<D<int, char> >::rebind_alloc<double>::other, D<double, char> >::value), ""); 99 static_assert((std::is_same<std::allocator_traits<E<char> >::rebind_alloc<double>::other, E<double> >::value), ""); 100 #endif 101 } 102
