81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
/* Copyright 2003-2021 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_INDEX_ACCESS_SEQUENCE_HPP
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#define BOOST_MULTI_INDEX_DETAIL_INDEX_ACCESS_SEQUENCE_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 <boost/mpl/if.hpp>
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#include <boost/mpl/size.hpp>
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#include <boost/multi_index_container_fwd.hpp>
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namespace boost{
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namespace multi_index{
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namespace detail{
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/* Successive access to the indices of a multi_index_container. Used as dst in
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* backbone function extract_(x,dst) to retrieve the destination indices
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* where iterators referring to x must be transferred to (in merging
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* operations).
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*/
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template<typename MultiIndexContainer,int N=0>
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struct index_access_sequence;
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struct index_access_sequence_terminal
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{
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index_access_sequence_terminal(void*){}
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};
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template<typename MultiIndexContainer,int N>
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struct index_access_sequence_normal
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{
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MultiIndexContainer* p;
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index_access_sequence_normal(MultiIndexContainer* p_):p(p_){}
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typename nth_index<MultiIndexContainer,N>::type&
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get(){return p->template get<N>();}
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index_access_sequence<MultiIndexContainer,N+1>
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next(){return index_access_sequence<MultiIndexContainer,N+1>(p);}
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};
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template<typename MultiIndexContainer,int N>
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struct index_access_sequence_base:
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mpl::if_c<
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N<mpl::size<typename MultiIndexContainer::index_type_list>::type::value,
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index_access_sequence_normal<MultiIndexContainer,N>,
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index_access_sequence_terminal
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>
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{};
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template<typename MultiIndexContainer,int N>
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struct index_access_sequence:
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index_access_sequence_base<MultiIndexContainer,N>::type
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{
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typedef typename index_access_sequence_base<
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MultiIndexContainer,N>::type super;
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index_access_sequence(MultiIndexContainer* p):super(p){}
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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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