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

 * This file is part of GEL, http://www.imm.dtu.dk/GEL

 * Copyright (C) the authors and DTU Informatics

 * For license and list of authors, see ../../doc/intro.pdf

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

/**

 * @file ItemID.h

 * @brief Base class for the integer IDs used to refer to mesh entities.

 */

#ifndef __HMESH_ITEMID_H__

#define __HMESH_ITEMID_H__

#include <iostream>

namespace HMesh

{

	template<typename ITEM, typename ITEMID>

	class AttributeVector;

    /** The ItemID class is simply a wrapper around an index. This class associates a type

     with the index. */

    template<typename T>

    class ItemID

    {

    public:

        ItemID(): index(INVALID_INDEX){}

        bool operator ==(const ItemID& other) const { return index == other.index; }

        bool operator !=(const ItemID& other) const { return index != other.index; }

        bool operator <(const ItemID& other) const { return index < other.index; }

		template<typename X>

		friend std::ostream& operator<<(std::ostream& os, const ItemID<X>&);

    private:

        typedef size_t IndexType;

        static const IndexType INVALID_INDEX =  -1;

        explicit ItemID(IndexType _index): index(_index){}

        friend class ConnectivityKernel;

        template<typename ITEM> friend class ItemVector;

        template<typename ITEM, typename ITEMID> friend class AttributeVector;

        IndexType index;

    };

	template<typename T>

	inline std::ostream& operator<<(std::ostream& os, const ItemID<T>& iid)

	{

		return (os << iid.index);

	}

}

#endif