/* Copyright 2016-2020 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_SEGMENT_BACKEND_HPP
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#define BOOST_POLY_COLLECTION_DETAIL_SEGMENT_BACKEND_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 <cstddef>
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#include <memory>
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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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/* Internal *virtual* interface of segment<Model,Allocator> (please note that
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* a non-virtual interface exists accessible through downcasting). Member
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* functions have been defined to minimize virtual function calls according to
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* usage patterns by poly_collection. For instance, ranges are returned rather
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* than iterators to allow for caching of and end sentinel at a higher level.
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* Passed elements are type erased with [const_]value_pointer.
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*/
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template<typename Model,typename Allocator>
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struct segment_backend
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{
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using segment_backend_unique_ptr=
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std::unique_ptr<segment_backend,void(*)(segment_backend*)>;
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using value_pointer=void*;
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using const_value_pointer=const void*;
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using base_iterator=typename Model::base_iterator;
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using const_base_iterator=typename Model::const_base_iterator;
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template<typename T>
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using const_iterator=typename Model::template const_iterator<T>;
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using base_sentinel=typename Model::base_sentinel;
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using range=std::pair<base_iterator,base_sentinel>;
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segment_backend()=default;
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segment_backend(const segment_backend&)=delete;
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segment_backend& operator=(const segment_backend&)=delete;
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virtual ~segment_backend()=default;
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virtual segment_backend_unique_ptr copy()const=0;
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virtual segment_backend_unique_ptr copy(const Allocator&)const=0;
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virtual segment_backend_unique_ptr empty_copy(const Allocator&)const=0;
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virtual segment_backend_unique_ptr move(const Allocator&)=0;
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virtual bool equal(const segment_backend&)const=0;
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virtual Allocator get_allocator()const noexcept=0;
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virtual base_iterator begin()const noexcept=0;
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virtual base_iterator end()const noexcept=0;
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virtual bool empty()const noexcept=0;
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virtual std::size_t size()const noexcept=0;
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virtual std::size_t max_size()const noexcept=0;
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virtual std::size_t capacity()const noexcept=0;
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virtual base_sentinel reserve(std::size_t)=0;
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virtual base_sentinel shrink_to_fit()=0;
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virtual range push_back(const_value_pointer)=0;
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virtual range push_back_move(value_pointer)=0;
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virtual range insert(const_base_iterator,const_value_pointer)=0;
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virtual range insert_move(const_base_iterator,value_pointer)=0;
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virtual range erase(const_base_iterator)=0;
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virtual range erase(const_base_iterator,const_base_iterator)=0;
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virtual range erase_till_end(const_base_iterator)=0;
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virtual range erase_from_begin(const_base_iterator)=0;
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virtual base_sentinel clear()noexcept=0;
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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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