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 // typedef Alloc::void_pointer 16 // | pointer_traits<pointer>::rebind<void> 17 // void_pointer; 18 // ... 19 // }; 20 21 #include <memory> 22 #include <type_traits> 23 24 template <class T> 25 struct Ptr {}; 26 27 template <class T> 28 struct A 29 { 30 typedef T value_type; 31 typedef Ptr<T> pointer; 32 }; 33 34 template <class T> 35 struct B 36 { 37 typedef T value_type; 38 }; 39 40 template <class T> 41 struct CPtr {}; 42 43 template <class T> 44 struct C 45 { 46 typedef T value_type; 47 typedef CPtr<void> void_pointer; 48 }; 49 50 int main() 51 { 52 static_assert((std::is_same<std::allocator_traits<A<char> >::void_pointer, Ptr<void> >::value), ""); 53 static_assert((std::is_same<std::allocator_traits<B<char> >::void_pointer, void*>::value), ""); 54 static_assert((std::is_same<std::allocator_traits<C<char> >::void_pointer, CPtr<void> >::value), ""); 55 } 56
