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