test/std/utilities/memory/allocator.traits/rebind_traits.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <memory>

// template <class Alloc>
// struct allocator_traits
// {
//     template <class T> using rebind_traits = allocator_traits<rebind_alloc<T>>;
//     ...
// };

#include <memory>
#include <type_traits>

#include "test_macros.h"

template <class T>
struct ReboundA {};

template <class T>
struct A
{
    typedef T value_type;

    template <class U> struct rebind {typedef ReboundA<U> other;};
};

template <class T, class U>
struct ReboundB {};

template <class T, class U>
struct B
{
    typedef T value_type;

    template <class V> struct rebind {typedef ReboundB<V, U> other;};
};

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

template <class T, class U>
struct D
{
    typedef T value_type;
};

template <class T>
struct E
{
    typedef T value_type;

    template <class U> struct rebind {typedef ReboundA<U> otter;};
};

int main(int, char**)
{
#if TEST_STD_VER >= 11
    static_assert((std::is_same<std::allocator_traits<A<char> >::rebind_traits<double>, std::allocator_traits<ReboundA<double> > >::value), "");
    static_assert((std::is_same<std::allocator_traits<B<int, char> >::rebind_traits<double>, std::allocator_traits<ReboundB<double, char> > >::value), "");
    static_assert((std::is_same<std::allocator_traits<C<char> >::rebind_traits<double>, std::allocator_traits<C<double> > >::value), "");
    static_assert((std::is_same<std::allocator_traits<D<int, char> >::rebind_traits<double>, std::allocator_traits<D<double, char> > >::value), "");
    static_assert((std::is_same<std::allocator_traits<E<char> >::rebind_traits<double>, std::allocator_traits<E<double> > >::value), "");
#else
    static_assert((std::is_same<std::allocator_traits<A<char> >::rebind_traits<double>::other, std::allocator_traits<ReboundA<double> > >::value), "");
    static_assert((std::is_same<std::allocator_traits<B<int, char> >::rebind_traits<double>::other, std::allocator_traits<ReboundB<double, char> > >::value), "");
    static_assert((std::is_same<std::allocator_traits<C<char> >::rebind_traits<double>::other, std::allocator_traits<C<double> > >::value), "");
    static_assert((std::is_same<std::allocator_traits<D<int, char> >::rebind_traits<double>::other, std::allocator_traits<D<double, char> > >::value), "");
    static_assert((std::is_same<std::allocator_traits<E<char> >::rebind_traits<double>::other, std::allocator_traits<E<double> > >::value), "");
#endif

  return 0;
}