pointer.h

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// Copyright (C) 2001 Open Source Telecom Corporation.
//  
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// 
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// granted for additional uses of the text contained in its release 
// of Common C++.
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// files to produce an executable, this does not by itself cause the
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/**
 * @file pointer.h
 * @short Template for creating reference count managed smart pointers.
 **/

namespace ost {

/**
 * Used to create and manage referece counted pointers.
 *
 * @author David Sugar <[e-mail]>
 * @short reference counted pointer template.
 */
template <class T>
class Pointer
{
protected:
	unsigned *ptrCount;
	T *ptrObject;

	void ptrDetach(void)
	{
		if(ptrCount && --(*ptrCount)==0)
		{
			delete ptrObject;
			delete ptrCount;
		}
		ptrObject = NULL;
		ptrCount = NULL;		
	}

public:
	explicit Pointer(T* ptr = NULL) : ptrObject(ptr)
	{
		ptrCount = new unsigned;
		*ptrCount = 1;
	}
	
	Pointer(const Pointer<T> &ref)
	{
		ptrObject = ref.ptrObject;
		ptrCount = ref.ptrCount;
		++(*ptrCount);	
	}

	inline virtual ~Pointer()
	{
		ptrDetach();
	}


	Pointer& operator=(const Pointer<T> &ref)
	{
		if(this != &ref)
		{
			ptrDetach();
			ptrObject = ref.ptrObject;
			ptrCount = ref.ptrCount;
			++(*ptrCount);
		}
		return *this;
	}

	inline T& operator*() const
		{return *ptrObject;};

	inline T* getObject() const
		{return ptrObject;};

	inline T* operator->() const
		{return ptrObject;};

	inline bool operator!() const
		{return (*ptrCount == 1);}; 

	inline int operator++() const
		{return ++(*ptrCount);};

	int operator--() const
	{
		if(*ptrCount == 1) 
		{
			delete this;
			return 0;
		}
		return --(*ptrCount);
	}
};	

}