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// Copyright (c) 2016 CNRS and LIRIS' Establishments (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Generalized_map/include/CGAL/Generalized_map_iterators_base.h $
// $Id: include/CGAL/Generalized_map_iterators_base.h b26b07a1242 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Guillaume Damiand <guillaume.damiand@liris.cnrs.fr>
//
#ifndef CGAL_GENERALIZED_MAP_ITERATORS_BASE_HH
#define CGAL_GENERALIZED_MAP_ITERATORS_BASE_HH 1
// to get OperationState type, some OP, and CMap_dart_iterator
#include <CGAL/Combinatorial_map_iterators_base.h>
// Other includes
#include <CGAL/Compact_container.h>
#include <queue>
#include <type_traits>
namespace CGAL {
/** @file generalized_map_iterators_base.h
* Basic classes that serve as tools for definition of iterators.
* There is 1 class:
* - GMap_extend_iterator<GMap,Ite,Ai> to extend the given iterator by
* adding the involution Ai.
*/
//****************************************************************************
/// Enum of all the possible operations used by the ++ operator.
/// Extension of the enum for combinatorial maps.
enum
{
OP_ALPHAI=OP_END+1, ///< Previous op was the first alpha.
OP_ALPHAJ, ///< Previous op was the second alpha.
OP_ALPHAK, ///< Previous op was the third alpha.
OP_ALPHAIJ, ///< Previous op was the composition of two alpha.
OP_ALPHAJI, ///< Previous op was the composition of two alpha.
};
//****************************************************************************
/* Class GMap_extend_iterator<Map,Ite,Ai> which extend a given iterator by
* adding Ai and by using a stack and a mark.
* General case when Ite does not have already a stack.
*/
template <typename Map_,typename Ite,int Ai,
typename Ite_has_stack=typename Ite::Use_mark>
class GMap_extend_iterator: public Ite
{
public:
typedef GMap_extend_iterator<Map_,Ite,Ai, Ite_has_stack> Self;
typedef Ite Base;
typedef typename Base::Dart_descriptor Dart_descriptor;
typedef typename Base::Map Map;
typedef typename Base::size_type size_type;
typedef Tag_true Use_mark;
static_assert(Ai<=Map::dimension &&
std::is_same<Ite_has_stack,Tag_false>::value);
public:
/// Main constructor.
GMap_extend_iterator(Map& amap, Dart_descriptor adart, size_type amark):
Base(amap, adart),
mmark_number(amark),
minitial_dart(adart)
{
if ( adart!=amap.null_descriptor )
{
this->mmap->mark(adart, mmark_number);
if (!this->mmap->template is_free<Ai>(adart))
{
mto_treat.push(this->mmap->template alpha<Ai>(adart));
}
}
}
/// Rewind of the iterator to its beginning.
void rewind()
{
CGAL_assertion(mmark_number != Map::INVALID_MARK);
Base::operator= ( Base(*this->mmap,minitial_dart) );
mto_treat = std::queue<Dart_descriptor>();
this->mmap->mark(minitial_dart, mmark_number);
if (!this->mmap->template is_free<Ai>(minitial_dart))
{
mto_treat.push(this->mmap->template alpha<Ai>(minitial_dart));
}
}
/// Prefix ++ operator.
Self& operator++()
{
CGAL_assertion(mmark_number != Map::INVALID_MARK);
CGAL_assertion(this->cont());
do
{
Base::operator++();
}
while ( this->cont() &&
this->mmap->is_marked(*this, mmark_number) );
if ( !this->cont() )
{
while ( !mto_treat.empty() &&
this->mmap->is_marked(mto_treat.front(), mmark_number))
{
mto_treat.pop();
}
if ( !mto_treat.empty() )
{
Base::operator= ( Base(*this->mmap,mto_treat.front()) );
mto_treat.pop();
this->mprev_op = OP_POP;
CGAL_assertion( !this->mmap->is_marked((*this), mmark_number) );
this->mmap->mark((*this), mmark_number);
if (!this->mmap->template is_free<Ai>(*this) &&
!this->mmap->is_marked(this->mmap->template alpha<Ai>(*this), mmark_number) )
{
mto_treat.push(this->mmap->template alpha<Ai>(*this));
}
}
}
else
{
this->mmap->mark((*this), mmark_number);
if (!this->mmap->template is_free<Ai>(*this) &&
!this->mmap->is_marked(this->mmap->alpha(*this, Ai), mmark_number) )
{
mto_treat.push(this->mmap->template alpha<Ai>(*this));
}
}
return *this;
}
/// Postfix ++ operator.
Self operator++(int)
{ Self res=*this; operator ++(); return res; }
protected:
/// Queue of darts to process.
std::queue<Dart_descriptor> mto_treat;
/// Index of the used mark.
size_type mmark_number;
/// Initial dart
Dart_descriptor minitial_dart;
};
//****************************************************************************
/* Class GMap_extend_iterator<Map,Ite,Ai> which extend a given iterator by
* adding Ai and by using a stack and a mark.
* Specialization when Ite has already a stack.
*/
template <typename Map_,typename Ite,int Ai>
class GMap_extend_iterator<Map_,Ite,Ai,Tag_true>: public Ite
{
public:
typedef GMap_extend_iterator<Map_,Ite,Ai,Tag_true> Self;
typedef Ite Base;
typedef typename Base::Dart_descriptor Dart_descriptor;
typedef typename Base::Map Map;
typedef Tag_true Use_mark;
typedef typename Map::size_type size_type;
/// Main constructor.
GMap_extend_iterator(Map& amap, Dart_descriptor adart, size_type amark):
Base(amap, adart, amark)
{
if (adart!=amap.null_descriptor)
{
if (!this->mmap->is_free(adart, Ai) &&
!this->mmap->is_marked(this->mmap->alpha(amap, Ai), this->mmark_number))
{
this->mto_treat.push(adart->alpha(Ai));
}
}
}
/// Rewind of the iterator to its beginning.
void rewind()
{
CGAL_assertion(this->mmark_number != Map::INVALID_MARK);
Base::rewind();
if ( !this->mmap->is_free(this->minitial_dart, Ai) )
{
this->mto_treat.push(this->mmap->alpha(this->minitial_dart, Ai));
}
}
/// Prefix ++ operator.
Self& operator++()
{
Base::operator++();
if ( this->cont() )
{
CGAL_assertion( this->mmap->is_marked(*this, this->mmark_number) );
if (!this->mmap->is_free(*this, Ai) &&
!this->mmap->is_marked(this->mmap->alpha(*this, Ai),
this->mmark_number))
{
this->mto_treat.push(this->mmap->alpha(*this, Ai));
}
}
return *this;
}
/// Postfix ++ operator.
Self operator++(int)
{ Self res=*this; operator ++(); return res; }
};
//****************************************************************************
//****************************************************************************
} // namespace CGAL
//******************************************************************************
#endif // CGAL_GENERALIZED_MAP_ITERATORS_BASE_HH
//******************************************************************************
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