/*-----------------------------------------------------------------------------+
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Copyright (c) 2009-2009: Joachim Faulhaber
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+------------------------------------------------------------------------------+
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENCE.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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+-----------------------------------------------------------------------------*/
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#ifndef BOOST_ICL_DETAIL_ELEMENT_ITERATOR_HPP_JOFA_091104
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#define BOOST_ICL_DETAIL_ELEMENT_ITERATOR_HPP_JOFA_091104
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#include <boost/mpl/if.hpp>
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#include <boost/iterator/iterator_facade.hpp>
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#include <boost/config/warning_disable.hpp>
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#include <boost/icl/type_traits/succ_pred.hpp>
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#include <boost/icl/detail/mapped_reference.hpp>
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namespace boost{namespace icl
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{
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//------------------------------------------------------------------------------
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template<class Type>
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struct is_std_pair
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{
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typedef is_std_pair<Type> type;
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BOOST_STATIC_CONSTANT(bool, value = false);
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};
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template<class FirstT, class SecondT>
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struct is_std_pair<std::pair<FirstT, SecondT> >
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{
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typedef is_std_pair<std::pair<FirstT, SecondT> > type;
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BOOST_STATIC_CONSTANT(bool, value = true);
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};
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//------------------------------------------------------------------------------
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template<class Type>
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struct first_element
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{
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typedef Type type;
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};
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template<class FirstT, class SecondT>
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struct first_element<std::pair<FirstT, SecondT> >
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{
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typedef FirstT type;
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};
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//------------------------------------------------------------------------------
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template <class SegmentIteratorT> class element_iterator;
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template<class IteratorT>
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struct is_reverse
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{
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typedef is_reverse type;
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BOOST_STATIC_CONSTANT(bool, value = false);
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};
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template<class BaseIteratorT>
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struct is_reverse<std::reverse_iterator<BaseIteratorT> >
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{
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typedef is_reverse<std::reverse_iterator<BaseIteratorT> > type;
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BOOST_STATIC_CONSTANT(bool, value = true);
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};
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template<class BaseIteratorT>
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struct is_reverse<icl::element_iterator<BaseIteratorT> >
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{
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typedef is_reverse<icl::element_iterator<BaseIteratorT> > type;
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BOOST_STATIC_CONSTANT(bool, value = is_reverse<BaseIteratorT>::value);
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};
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//------------------------------------------------------------------------------
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template<class SegmentT>
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struct elemental;
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#ifdef ICL_USE_INTERVAL_TEMPLATE_TEMPLATE
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template<class DomainT, ICL_COMPARE Compare, ICL_INTERVAL(ICL_COMPARE) Interval>
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struct elemental<ICL_INTERVAL_TYPE(Interval,DomainT,Compare) >
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{
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typedef ICL_INTERVAL_TYPE(Interval,DomainT,Compare) segment_type;
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typedef segment_type interval_type;
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typedef DomainT type;
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typedef DomainT domain_type;
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typedef DomainT codomain_type;
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typedef DomainT transit_type;
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};
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template< class DomainT, class CodomainT,
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ICL_COMPARE Compare, ICL_INTERVAL(ICL_COMPARE) Interval >
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struct elemental<std::pair<ICL_INTERVAL_TYPE(Interval,DomainT,Compare) const, CodomainT> >
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{
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typedef std::pair<ICL_INTERVAL_TYPE(Interval,DomainT,Compare), CodomainT> segment_type;
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typedef ICL_INTERVAL_TYPE(Interval,DomainT,Compare) interval_type;
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typedef std::pair<DomainT, CodomainT> type;
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typedef DomainT domain_type;
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typedef CodomainT codomain_type;
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typedef mapped_reference<DomainT, CodomainT> transit_type;
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};
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#else //ICL_USE_INTERVAL_TEMPLATE_TYPE
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template<ICL_INTERVAL(ICL_COMPARE) Interval>
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struct elemental
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{
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typedef ICL_INTERVAL_TYPE(Interval,DomainT,Compare) segment_type;
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typedef segment_type interval_type;
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typedef typename interval_traits<interval_type>::domain_type domain_type;
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typedef domain_type type;
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typedef domain_type codomain_type;
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typedef domain_type transit_type;
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};
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template< class CodomainT, ICL_INTERVAL(ICL_COMPARE) Interval >
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struct elemental<std::pair<ICL_INTERVAL_TYPE(Interval,DomainT,Compare) const, CodomainT> >
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{
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typedef std::pair<ICL_INTERVAL_TYPE(Interval,DomainT,Compare), CodomainT> segment_type;
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typedef ICL_INTERVAL_TYPE(Interval,DomainT,Compare) interval_type;
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typedef typename interval_traits<interval_type>::domain_type domain_type;
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typedef CodomainT codomain_type;
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typedef std::pair<domain_type, codomain_type> type;
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typedef mapped_reference<domain_type, codomain_type> transit_type;
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};
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#endif //ICL_USE_INTERVAL_TEMPLATE_TEMPLATE
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//------------------------------------------------------------------------------
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//- struct segment_adapter
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//------------------------------------------------------------------------------
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template<class SegmentIteratorT, class SegmentT>
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struct segment_adapter;
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#ifdef ICL_USE_INTERVAL_TEMPLATE_TEMPLATE
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template<class SegmentIteratorT, class DomainT, ICL_COMPARE Compare, ICL_INTERVAL(ICL_COMPARE) Interval>
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struct segment_adapter<SegmentIteratorT, ICL_INTERVAL_TYPE(Interval,DomainT,Compare) >
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{
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typedef segment_adapter type;
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typedef ICL_INTERVAL_TYPE(Interval,DomainT,Compare) segment_type;
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typedef segment_type interval_type;
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typedef typename interval_type::difference_type domain_difference_type;
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typedef DomainT domain_type;
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typedef DomainT codomain_type;
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typedef domain_type element_type;
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typedef domain_type& transit_type;
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static domain_type first (const SegmentIteratorT& leaper){ return leaper->first(); }
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static domain_type last (const SegmentIteratorT& leaper){ return leaper->last(); }
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static domain_difference_type length(const SegmentIteratorT& leaper){ return leaper->length();}
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static transit_type transient_element(domain_type& inter_pos, const SegmentIteratorT& leaper,
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const domain_difference_type& sneaker)
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{
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inter_pos = is_reverse<SegmentIteratorT>::value ? leaper->last() - sneaker
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: leaper->first() + sneaker;
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return inter_pos;
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}
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};
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template < class SegmentIteratorT, class DomainT, class CodomainT,
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ICL_COMPARE Compare, ICL_INTERVAL(ICL_COMPARE) Interval >
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struct segment_adapter<SegmentIteratorT, std::pair<ICL_INTERVAL_TYPE(Interval,DomainT,Compare) const, CodomainT> >
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{
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typedef segment_adapter type;
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typedef ICL_INTERVAL_TYPE(Interval,DomainT,Compare) interval_type;
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typedef DomainT domain_type;
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typedef std::pair<DomainT, CodomainT> element_type;
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typedef CodomainT codomain_type;
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typedef mapped_reference<DomainT, CodomainT> transit_type;
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typedef typename difference_type_of<interval_traits<interval_type> >::type
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domain_difference_type;
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static domain_type first (const SegmentIteratorT& leaper){ return leaper->first.first(); }
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static domain_type last (const SegmentIteratorT& leaper){ return leaper->first.last(); }
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static domain_difference_type length(const SegmentIteratorT& leaper){ return leaper->first.length();}
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static transit_type transient_element(domain_type& inter_pos, const SegmentIteratorT& leaper,
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const domain_difference_type& sneaker)
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{
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inter_pos = is_reverse<SegmentIteratorT>::value ? leaper->first.last() - sneaker
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: leaper->first.first() + sneaker;
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return transit_type(inter_pos, leaper->second);
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}
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};
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#else // ICL_USE_INTERVAL_TEMPLATE_TYPE
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template<class SegmentIteratorT, ICL_INTERVAL(ICL_COMPARE) Interval>
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struct segment_adapter
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{
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typedef segment_adapter type;
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typedef ICL_INTERVAL_TYPE(Interval,DomainT,Compare) segment_type;
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typedef segment_type interval_type;
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typedef typename interval_traits<interval_type>::domain_type domain_type;
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typedef domain_type codomain_type;
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typedef domain_type element_type;
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typedef domain_type& transit_type;
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typedef typename difference_type_of<interval_traits<interval_type> >::type
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domain_difference_type;
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static domain_type first (const SegmentIteratorT& leaper){ return leaper->first(); }
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static domain_type last (const SegmentIteratorT& leaper){ return leaper->last(); }
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static domain_difference_type length(const SegmentIteratorT& leaper){ return icl::length(*leaper);}
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static transit_type transient_element(domain_type& inter_pos, const SegmentIteratorT& leaper,
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const domain_difference_type& sneaker)
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{
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inter_pos = is_reverse<SegmentIteratorT>::value ? icl::last(*leaper) - sneaker
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: icl::first(*leaper) + sneaker;
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return inter_pos;
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}
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};
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template < class SegmentIteratorT, class CodomainT, ICL_INTERVAL(ICL_COMPARE) Interval >
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struct segment_adapter<SegmentIteratorT, std::pair<ICL_INTERVAL_TYPE(Interval,DomainT,Compare) const, CodomainT> >
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{
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typedef segment_adapter type;
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typedef ICL_INTERVAL_TYPE(Interval,DomainT,Compare) interval_type;
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typedef typename interval_traits<interval_type>::domain_type domain_type;
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typedef CodomainT codomain_type;
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typedef std::pair<domain_type, codomain_type> element_type;
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typedef mapped_reference<domain_type, CodomainT> transit_type;
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typedef typename difference_type_of<interval_traits<interval_type> >::type
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domain_difference_type;
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static domain_type first (const SegmentIteratorT& leaper){ return leaper->first.first(); }
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static domain_type last (const SegmentIteratorT& leaper){ return leaper->first.last(); }
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static domain_difference_type length(const SegmentIteratorT& leaper){ return icl::length(leaper->first);}
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static transit_type transient_element(domain_type& inter_pos, const SegmentIteratorT& leaper,
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const domain_difference_type& sneaker)
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{
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inter_pos = is_reverse<SegmentIteratorT>::value ? icl::last(leaper->first) - sneaker
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: icl::first(leaper->first) + sneaker;
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return transit_type(inter_pos, leaper->second);
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}
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};
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#endif // ICL_USE_INTERVAL_TEMPLATE_TEMPLATE
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template <class SegmentIteratorT>
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class element_iterator
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: public boost::iterator_facade<
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element_iterator<SegmentIteratorT>
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, typename elemental<typename SegmentIteratorT::value_type>::transit_type
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, boost::bidirectional_traversal_tag
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, typename elemental<typename SegmentIteratorT::value_type>::transit_type
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>
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{
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public:
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typedef element_iterator type;
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typedef SegmentIteratorT segment_iterator;
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typedef typename SegmentIteratorT::value_type segment_type;
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typedef typename first_element<segment_type>::type interval_type;
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typedef typename elemental<segment_type>::type element_type;
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typedef typename elemental<segment_type>::domain_type domain_type;
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typedef typename elemental<segment_type>::codomain_type codomain_type;
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typedef typename elemental<segment_type>::transit_type transit_type;
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typedef transit_type value_type;
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typedef typename difference_type_of<interval_traits<interval_type> >::type
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domain_difference_type;
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private:
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typedef typename segment_adapter<segment_iterator,segment_type>::type adapt;
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struct enabler{};
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public:
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element_iterator()
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: _saltator(identity_element<segment_iterator>::value())
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, _reptator(identity_element<domain_difference_type>::value()){}
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explicit element_iterator(segment_iterator jumper)
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: _saltator(jumper), _reptator(identity_element<domain_difference_type>::value()) {}
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template <class SaltatorT>
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element_iterator
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( element_iterator<SaltatorT> const& other
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, typename enable_if<boost::is_convertible<SaltatorT*,SegmentIteratorT*>, enabler>::type = enabler())
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: _saltator(other._saltator), _reptator(other._reptator) {}
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private:
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friend class boost::iterator_core_access;
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template <class> friend class element_iterator;
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template <class SaltatorT>
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bool equal(element_iterator<SaltatorT> const& other) const
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{
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return this->_saltator == other._saltator
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&& this->_reptator == other._reptator;
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}
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void increment()
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{
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if(_reptator < icl::pred(adapt::length(_saltator)))
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++_reptator;
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else
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{
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++_saltator;
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_reptator = identity_element<domain_difference_type>::value();
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}
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}
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void decrement()
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{
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if(identity_element<domain_difference_type>::value() < _reptator)
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--_reptator;
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else
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{
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--_saltator;
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_reptator = adapt::length(_saltator);
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--_reptator;
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}
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}
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value_type dereference()const
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{
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return adapt::transient_element(_inter_pos, _saltator, _reptator);
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}
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private:
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segment_iterator _saltator; // satltare: to jump : the fast moving iterator
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mutable domain_difference_type _reptator; // reptare: to sneak : the slow moving iterator 0 based
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mutable domain_type _inter_pos; // inter position : Position within the current segment
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// _saltator->first.first() <= _inter_pos <= _saltator->first.last()
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};
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}} // namespace icl boost
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#endif // BOOST_ICL_DETAIL_ELEMENT_ITERATOR_HPP_JOFA_091104
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