final/test/utilities/allocator.adaptor/allocator.adaptor.members/select_on_container_copy_construction.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 OuterAlloc, class... InnerAllocs>
//   class scoped_allocator_adaptor

// scoped_allocator_adaptor select_on_container_copy_construction() const;

#include <scoped_allocator>
#include <cassert>

#include "../allocators.h"

int main()
{
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

    {
        typedef std::scoped_allocator_adaptor<A1<int>> A;
        A a1(A1<int>(3));
        assert(a1.outer_allocator().id() == 3);
        A a2 = std::allocator_traits<A>::select_on_container_copy_construction(a1);
        assert(a2.outer_allocator().id() == 3);
    }

    {
        typedef std::scoped_allocator_adaptor<A3<int>> A;
        A a1(A3<int>(3));
        assert(a1.outer_allocator().id() == 3);
        A a2 = std::allocator_traits<A>::select_on_container_copy_construction(a1);
        assert(a2.outer_allocator().id() == -1);
    }

    {
        typedef std::scoped_allocator_adaptor<A1<int>, A2<int>, A3<int>> A;
        A a1(A1<int>(1), A2<int>(2), A3<int>(3));
        assert(a1.outer_allocator().id() == 1);
        assert(a1.inner_allocator().outer_allocator().id() == 2);
        assert(a1.inner_allocator().inner_allocator().outer_allocator().id() == 3);
        A a2 = std::allocator_traits<A>::select_on_container_copy_construction(a1);
        assert(a2.outer_allocator().id() == 1);
        assert(a2.inner_allocator().outer_allocator().id() == 2);
        assert(a2.inner_allocator().inner_allocator().outer_allocator().id() == -1);
    }

#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
}