test/std/utilities/allocator.adaptor/allocator.adaptor.types/is_always_equal.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
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++98, c++03

// <memory>

// template <class OuterAlloc, class... InnerAllocs>
//   class scoped_allocator_adaptor

// typedef see below is_always_equal;

#include <scoped_allocator>
#include <type_traits>

#include "test_macros.h"
#include "allocators.h"
#include "min_allocator.h"

int main(int, char**)
{
    // sanity checks
    static_assert( (std::is_same<
            std::allocator_traits<A1<int>>::is_always_equal, std::false_type>::value
            ), "" );

    static_assert( (std::is_same<
            std::allocator_traits<min_allocator<int>>::is_always_equal, std::true_type>::value
            ), "" );

    // wrapping one allocator
    static_assert(
        (std::is_same<
            std::scoped_allocator_adaptor<A1<int>>::is_always_equal,
            std::allocator_traits<A1<int>>::is_always_equal
        >::value), "");

    // wrapping one allocator
    static_assert(
        (std::is_same<
            std::scoped_allocator_adaptor<min_allocator<int>>::is_always_equal,
            std::allocator_traits<min_allocator<int>>::is_always_equal
        >::value), "");

    // wrapping two allocators (check the values instead of the types)
    static_assert((
            std::scoped_allocator_adaptor<A1<int>, A2<int>>::is_always_equal::value ==
            ( std::allocator_traits<A1<int>>::is_always_equal::value &&
              std::allocator_traits<A2<int>>::is_always_equal::value)
        ), "");

    // wrapping two allocators (check the values instead of the types)
    static_assert((
            std::scoped_allocator_adaptor<A1<int>, min_allocator<int>>::is_always_equal::value ==
            ( std::allocator_traits<A1<int>>::is_always_equal::value &&
              std::allocator_traits<min_allocator<int>>::is_always_equal::value)
        ), "");


    // wrapping three allocators (check the values instead of the types)
    static_assert((
            std::scoped_allocator_adaptor<A1<int>, A2<int>, A3<int>>::is_always_equal::value ==
            ( std::allocator_traits<A1<int>>::is_always_equal::value &&
              std::allocator_traits<A2<int>>::is_always_equal::value &&
              std::allocator_traits<A3<int>>::is_always_equal::value)
        ), "");

  return 0;
}