rebind.pass.cpp revision b64f8b07c104c6cc986570ac8ee0ed16a9f23976 
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
22template <class T>
23struct A
24{
25};
26
27template <class T> struct B1 {};
28
29template <class T>
30struct 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
39template <class T, class U>
40struct C
41{
42};
43
44template <class T, class U> struct D1 {};
45
46template <class T, class U>
47struct 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
56int 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