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