src/reference.h


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#ifndef __REFERENCE_H__
#define __REFERENCE_H__

template<typename C>
class Reference
{
public:
	Reference()
		{ m_ptr = NULL; }

	Reference(C* ptr)
	{
		m_ptr = ptr;
		addref();
	}

	Reference(C* ptr, bool addref)
	{
		m_ptr = ptr;
		if(addref)
			addref();
	}

	~Reference()
	{
		release();
	}

	Reference(const Reference& orig)
	{
		m_ptr = orig.m_ptr;
		addref();
	}

	Reference& operator=(const C* ptr)
	{
		C* old = m_ptr;
		m_ptr = (C*)ptr;
		addref();
		if(old)
			old->release();
		return *this;
	}

	Reference& operator=(const Reference& orig)
		{ return operator=(orig.m_ptr); }

	void attach(C* ptr)
	{
		release();
		m_ptr = ptr;
	}

	C* detach()
	{
		C* ptr = m_ptr;
		m_ptr = NULL;
		return ptr;
	}

	operator C*() const
		{ return m_ptr; }

	C* operator->() const
		{ return m_ptr; }

#if 0
	operator bool() const
	{
		return m_ptr != NULL;
	}
#endif

	void release()
	{
		if(m_ptr)
			m_ptr->release();
		m_ptr = NULL;
	}

	void addref()
	{
		if(m_ptr)
			m_ptr->addRef();
	}

private:
	C* m_ptr;
};

class Instance
{
public:
	Instance()
		{ m_x = 0; }
	virtual ~Instance()
		{ }
	void addRef()
		{ m_x++; }
	void release()
	{
		if((--m_x) <= 0)
			delete this;
	}

private:
	// The reference count
	int m_x;
};

#endif //__REFERENCE_H__