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/* ----------------------------------------------------------------------- *
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* This file is part of GEL, http://www.imm.dtu.dk/GEL
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* Copyright (C) the authors and DTU Informatics
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* For license and list of authors, see ../../doc/intro.pdf
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* ----------------------------------------------------------------------- */
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/**
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* @file Iterators.h
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* @brief Contains class for iterating over mesh entities in a HMesh.
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*/
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#ifndef __HMESH_ITERATORS_H__
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#define __HMESH_ITERATORS_H__
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#include "ItemVector.h"
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namespace HMesh
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{
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/** Traverse the entities of an HMesh in the order they are stored in the
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data structure. */
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template<typename ITEM>
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class IDIterator
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{
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public:
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typedef ItemID<ITEM> ID;
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// typedefs to accommodiate stl compliance
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typedef std::bidirectional_iterator_tag iterator_category;
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typedef ptrdiff_t difference_type;
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typedef ID value_type;
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typedef value_type reference;
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typedef value_type* pointer;
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/// constructor (default: skipping enabled)
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IDIterator(const ItemVector<ITEM>& _item_vector, ID _id, bool _skip = true);
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/// prefix increment
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IDIterator& operator ++();
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/// postfix increment
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IDIterator& operator ++(int);
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/// prefix decrement
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IDIterator& operator --();
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/// postfix decrement
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IDIterator& operator --(int);
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/// equal to
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bool operator ==(const IDIterator& other) const;
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/// not equal to
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bool operator !=(const IDIterator& other) const;
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/// indirection
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reference operator *();
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/// member by pointer
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pointer operator ->();
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/// cast
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//operator VertexID() const;
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private:
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const ItemVector<ITEM>* item_vector;
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ID id;
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bool skip;
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};
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template<typename ITEM>
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class IDIteratorPair
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{
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public:
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IDIteratorPair(IDIterator<ITEM> _f, IDIterator<ITEM> _l): f(_f), l(_l) {}
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IDIterator<ITEM> begin() {return f;}
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IDIterator<ITEM> end() {return l;}
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private:
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IDIterator<ITEM> f,l;
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};
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/*-----------------------------------------
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* IDIterator template implementation
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*-----------------------------------------*/
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template<typename ITEM>
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inline IDIterator<ITEM>::IDIterator(const ItemVector<ITEM>& _item_vector, ID _id, bool _skip)
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: item_vector(&_item_vector), id(_id), skip(_skip){}
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template<typename ITEM>
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inline IDIterator<ITEM>& IDIterator<ITEM>::operator ++(int)
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{ return ++(*this); }
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template<typename ITEM>
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inline IDIterator<ITEM>& IDIterator<ITEM>::operator --(int)
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{ return --(*this); }
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template<typename ITEM>
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inline bool IDIterator<ITEM>::operator ==(const IDIterator<ITEM>& other) const
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{ return item_vector == other.item_vector && id == other.id; }
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template<typename ITEM>
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inline bool IDIterator<ITEM>::operator !=(const IDIterator<ITEM>& other) const
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{ return item_vector != other.item_vector || id != other.id; }
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template<typename ITEM>
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inline ItemID<ITEM> IDIterator<ITEM>::operator *()
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{ return id; }
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template<typename ITEM>
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inline ItemID<ITEM>* IDIterator<ITEM>::operator ->()
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{ return &id; }
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template<typename ITEM>
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inline IDIterator<ITEM>& IDIterator<ITEM>::operator ++()
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{
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id = item_vector->index_next(id, skip);
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return *this;
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}
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template<typename ITEM>
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inline IDIterator<ITEM>& IDIterator<ITEM>::operator --()
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{
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id = item_vector->index_prev(id, skip);
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return *this;
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}
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}
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#endif
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