/* Copyright 2003-2020 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/multi_index for library home page.
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*/
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#ifndef BOOST_MULTI_INDEX_DETAIL_COPY_MAP_HPP
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#define BOOST_MULTI_INDEX_DETAIL_COPY_MAP_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/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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#include <algorithm>
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#include <boost/core/addressof.hpp>
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#include <boost/core/no_exceptions_support.hpp>
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#include <boost/move/core.hpp>
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#include <boost/move/utility_core.hpp>
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#include <boost/multi_index/detail/allocator_traits.hpp>
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#include <boost/multi_index/detail/auto_space.hpp>
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#include <boost/multi_index/detail/raw_ptr.hpp>
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#include <boost/noncopyable.hpp>
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#include <functional>
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namespace boost{
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namespace multi_index{
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namespace detail{
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/* copy_map is used as an auxiliary structure during copy_() operations.
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* When a container with n nodes is replicated, node_map holds the pairings
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* between original and copied nodes, and provides a fast way to find a
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* copied node from an original one.
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* The semantics of the class are not simple, and no attempt has been made
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* to enforce it: multi_index_container handles it right. On the other hand,
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* the const interface, which is the one provided to index implementations,
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* only allows for:
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* - Enumeration of pairs of (original,copied) nodes (excluding the headers),
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* - fast retrieval of copied nodes (including the headers.)
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*/
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template <typename Node>
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struct copy_map_entry
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{
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copy_map_entry(Node* f,Node* s):first(f),second(s){}
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Node* first;
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Node* second;
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bool operator<(const copy_map_entry<Node>& x)const
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{
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return std::less<Node*>()(first,x.first);
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}
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};
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struct copy_map_value_copier
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{
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template<typename Value>
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const Value& operator()(Value& x)const{return x;}
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};
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struct copy_map_value_mover
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{
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template<typename Value>
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BOOST_RV_REF(Value) operator()(Value& x)const{return boost::move(x);}
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};
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template <typename Node,typename Allocator>
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class copy_map:private noncopyable
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{
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typedef typename rebind_alloc_for<
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Allocator,Node
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>::type allocator_type;
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typedef allocator_traits<allocator_type> alloc_traits;
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typedef typename alloc_traits::pointer pointer;
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public:
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typedef const copy_map_entry<Node>* const_iterator;
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typedef typename alloc_traits::size_type size_type;
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copy_map(
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const Allocator& al,size_type size,Node* header_org,Node* header_cpy):
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al_(al),size_(size),spc(al_,size_),n(0),
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header_org_(header_org),header_cpy_(header_cpy),released(false)
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{}
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~copy_map()
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{
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if(!released){
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for(size_type i=0;i<n;++i){
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alloc_traits::destroy(
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al_,boost::addressof((spc.data()+i)->second->value()));
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deallocate((spc.data()+i)->second);
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}
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}
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}
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const_iterator begin()const{return raw_ptr<const_iterator>(spc.data());}
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const_iterator end()const{return raw_ptr<const_iterator>(spc.data()+n);}
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void copy_clone(Node* node){clone(node,copy_map_value_copier());}
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void move_clone(Node* node){clone(node,copy_map_value_mover());}
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Node* find(Node* node)const
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{
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if(node==header_org_)return header_cpy_;
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return std::lower_bound(
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begin(),end(),copy_map_entry<Node>(node,0))->second;
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}
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void release()
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{
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released=true;
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}
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private:
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allocator_type al_;
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size_type size_;
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auto_space<copy_map_entry<Node>,Allocator> spc;
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size_type n;
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Node* header_org_;
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Node* header_cpy_;
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bool released;
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pointer allocate()
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{
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return alloc_traits::allocate(al_,1);
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}
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void deallocate(Node* node)
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{
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alloc_traits::deallocate(al_,static_cast<pointer>(node),1);
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}
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template<typename ValueAccess>
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void clone(Node* node,ValueAccess access)
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{
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(spc.data()+n)->first=node;
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(spc.data()+n)->second=raw_ptr<Node*>(allocate());
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BOOST_TRY{
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alloc_traits::construct(
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al_,boost::addressof((spc.data()+n)->second->value()),
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access(node->value()));
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}
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BOOST_CATCH(...){
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deallocate((spc.data()+n)->second);
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BOOST_RETHROW;
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}
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BOOST_CATCH_END
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++n;
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if(n==size_){
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std::sort(
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raw_ptr<copy_map_entry<Node>*>(spc.data()),
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raw_ptr<copy_map_entry<Node>*>(spc.data())+size_);
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}
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}
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};
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} /* namespace multi_index::detail */
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} /* namespace multi_index */
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} /* namespace boost */
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#endif
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