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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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    /*-----------------------------------------
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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