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/*
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* Written by Christian Thode Larsen 2009-2010
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* Contact: thode2d@gmail.com
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* Based on original work by J. Andreas Baerentzen
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* Inspired by OpenMesh (www.openmesh.org)
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*/
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#ifndef __HMESH_ITEMID_H__
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#define __HMESH_ITEMID_H__
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#include <cstdint>
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namespace HMesh
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{
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	typedef uint32_t IndexType;
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	const IndexType NULL_INDEX =  UINT32_MAX;
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	class ItemID
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	{
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	public:
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		ItemID(IndexType _index = NULL_INDEX);
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		bool operator ==(const ItemID& other) const;
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		bool operator !=(const ItemID& other) const;
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		bool operator >=(const ItemID& other) const;
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		bool operator <=(const ItemID& other) const;
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		bool operator <(const ItemID& other) const;
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		bool operator >(const ItemID& other) const;
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		ItemID& operator ++();
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		ItemID& operator ++(int);
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		ItemID& operator --();
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		ItemID& operator --(int);
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		bool valid() const;
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		IndexType idx() const;
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		void invalidate();
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	private:
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		IndexType index;
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	};
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	class VertexID : public ItemID
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	{
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	public:
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		VertexID(IndexType _index = NULL_INDEX) : ItemID(_index){}
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	};
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	class FaceID : public ItemID
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	{
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	public:
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		FaceID(IndexType _index = NULL_INDEX) : ItemID(_index){}
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	};
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	class HalfEdgeID : public ItemID
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	{
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	public:
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		HalfEdgeID(IndexType _index = NULL_INDEX) : ItemID(_index){}
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	};
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	inline ItemID::ItemID(IndexType _index) : index(_index){}
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	inline bool ItemID::operator ==(const ItemID& other) const
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	{ return index == other.index; }
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	inline bool ItemID::operator !=(const ItemID& other) const
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	{ return index != other.index; }
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	inline bool ItemID::operator >=(const ItemID& other) const
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	{ return index >= other.index; }
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	inline bool ItemID::operator <=(const ItemID& other) const
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	{ return index <= other.index; }
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	inline bool ItemID::operator <(const ItemID& other) const
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	{ return index < other.index; }
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	inline bool ItemID::operator >(const ItemID& other) const
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	{ return index > other.index; }
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	inline ItemID& ItemID::operator ++()
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	{
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		++index;
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		return *this;
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	}
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	inline ItemID& ItemID::operator ++(int)
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	{
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		++(*this);
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		return *this;
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	}
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	inline ItemID& ItemID::operator --()
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	{
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		--index;
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		return *this;
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	}
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	inline ItemID& ItemID::operator --(int)
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	{
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		--(*this);
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		return *this;
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	}
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	inline bool ItemID::valid() const
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	{ return index != NULL_INDEX; }
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	inline void ItemID::invalidate()
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	{ index = NULL_INDEX; }
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	inline IndexType ItemID::idx() const
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	{ return index; }
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}
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#endif