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