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