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Rev 667 Rev 677
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     with the index. */
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     with the index. */
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    template<typename T>
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    template<typename T>
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    class ItemID
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    class ItemID
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    {
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    {
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    public:
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    public:
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        typedef size_t IndexType;
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        ItemID(): index(INVALID_INDEX){}
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        ItemID(): index(INVALID_INDEX){}
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        bool operator ==(const ItemID& other) const { return index == other.index; }
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        bool operator ==(const ItemID& other) const { return index == other.index; }
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        bool operator !=(const ItemID& other) const { return index != other.index; }
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        bool operator !=(const ItemID& other) const { return index != other.index; }
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        bool operator <(const ItemID& other) const { return index < other.index; }
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        bool operator <(const ItemID& other) const { return index < other.index; }
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        IndexType get_index() const { return index;}
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    private:
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    private:
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        typedef size_t IndexType;
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        static const IndexType INVALID_INDEX =  -1;
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        IndexType index;
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        IndexType index;
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        static const IndexType INVALID_INDEX =  -1;
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        explicit ItemID(IndexType _index): index(_index){}
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        explicit ItemID(IndexType _index): index(_index){}
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        friend class ConnectivityKernel;
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        friend class ConnectivityKernel;
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