activeinstancecountergarbagecollection.cpp

/*
 * Reference.h
 *
 *  Created on: Mar 28, 2010
 *      Author: tehlike
 */
#include "../Threading/Mutex.h"
#ifndef REFERENCE_H_
#define REFERENCE_H_
template <typename T>
class Reference
{
private:
	T* item;
	int* activeInstancesCounter;
	Mutex* mutex;

	bool DecrementUsage()
	{
		bool shouldDelete;
		mutex->Lock();
		(*activeInstancesCounter)--;
		shouldDelete=(*activeInstancesCounter);
		mutex->Unlock();
		return shouldDelete;
	}
	void IncrementUsage()
	{
		mutex->Lock();
		(*activeInstancesCounter)++;
		mutex->Unlock();
	}
public:
	Reference(const T* item)
	{
		this->item=item;
		this->activeInstancesCounter=new int;
		this->mutex=new Mutex();
	}
	Reference(const Reference r)
	{

		this->item=r.item;
		this->activeInstancesCounter=r.activeInstancesCounter;
		this->mutex=r.mutex;
		IncrementUsage();

	}
	T& operator()()
	{
		return *T;
	}
	virtual ~Reference()
	{
		if(DecrementUsage())
		{
			delete item;
			delete mutex;
		}
	}
};

#endif /* REFERENCE_H_ */