final/test/utilities/memory/allocator.traits/allocator.traits.types/void_pointer.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <memory>

// template <class Alloc>
// struct allocator_traits
// {
//     typedef Alloc::void_pointer
//           | pointer_traits<pointer>::rebind<void>
//                                          void_pointer;
//     ...
// };

#include <memory>
#include <type_traits>

template <class T>
struct Ptr {};

template <class T>
struct A
{
    typedef T value_type;
    typedef Ptr<T> pointer;
};

template <class T>
struct B
{
    typedef T value_type;
};

template <class T>
struct CPtr {};

template <class T>
struct C
{
    typedef T value_type;
    typedef CPtr<void> void_pointer;
};

int main()
{
    static_assert((std::is_same<std::allocator_traits<A<char> >::void_pointer, Ptr<void> >::value), "");
    static_assert((std::is_same<std::allocator_traits<B<char> >::void_pointer, void*>::value), "");
    static_assert((std::is_same<std::allocator_traits<C<char> >::void_pointer, CPtr<void> >::value), "");
}