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/* Copyright 2016-2017 Joaquin M Lopez Munoz.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*
* See http://www.boost.org/libs/poly_collection for library home page.
*/
#ifndef BOOST_POLY_COLLECTION_DETAIL_NEWDELETE_ALLOCATOR_HPP
#define BOOST_POLY_COLLECTION_DETAIL_NEWDELETE_ALLOCATOR_HPP
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/poly_collection/detail/is_constructible.hpp>
#include <memory>
#include <new>
#include <utility>
namespace boost{
namespace poly_collection{
namespace detail{
/* In order to comply with [container.requirements.general]/3,
* newdelete_allocator_adaptor<Allocator> overrides
* Allocator::construct/destroy with vanilla new/delete implementations.
* Used therefore in all auxiliary internal structures.
*/
template<typename Allocator>
struct newdelete_allocator_adaptor:Allocator
{
using traits=std::allocator_traits<Allocator>;
using value_type=typename traits::value_type;
using size_type=typename traits::size_type;
using difference_type=typename traits::difference_type;
using pointer=typename traits::pointer;
using const_pointer=typename traits::const_pointer;
using void_pointer=typename traits::void_pointer;
using const_void_pointer=typename traits::const_void_pointer;
using propagate_on_container_copy_assignment=
typename traits::propagate_on_container_copy_assignment;
using propagate_on_container_move_assignment=
typename traits::propagate_on_container_move_assignment;
using propagate_on_container_swap=
typename traits::propagate_on_container_swap;
template<typename U>
struct rebind
{
using other=newdelete_allocator_adaptor<
typename traits::template rebind_alloc<U>>;
};
newdelete_allocator_adaptor()=default;
newdelete_allocator_adaptor(const newdelete_allocator_adaptor&)=default;
template<
typename Allocator2,
typename std::enable_if<
is_constructible<Allocator,Allocator2>::value
>::type* =nullptr
>
newdelete_allocator_adaptor(const Allocator2& x)noexcept:Allocator{x}{}
template<
typename Allocator2,
typename std::enable_if<
is_constructible<Allocator,Allocator2>::value
>::type* =nullptr
>
newdelete_allocator_adaptor(
const newdelete_allocator_adaptor<Allocator2>& x)noexcept:
Allocator{static_cast<const Allocator2&>(x)}{}
newdelete_allocator_adaptor& operator=(
const newdelete_allocator_adaptor&)=default;
template<typename T,typename... Args>
void construct(T* p,Args&&... args)
{
::new ((void*)p) T(std::forward<Args>(args)...);
}
template<typename T>
void destroy(T* p)
{
p->~T();
}
};
} /* namespace poly_collection::detail */
} /* namespace poly_collection */
} /* namespace boost */
#endif
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