/*
 * Copyright (c) 2004, Nate Nielsen
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *     * Redistributions of source code must retain the above
 *       copyright notice, this list of conditions and the
 *       following disclaimer.
 *     * Redistributions in binary form must reproduce the
 *       above copyright notice, this list of conditions and
 *       the following disclaimer in the documentation and/or
 *       other materials provided with the distribution.
 *     * The names of contributors to this software may not be
 *       used to endorse or promote products derived from this
 *       software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 *
 * CONTRIBUTORS
 *  Nate Nielsen <nielsen@memberwebs.com>
 *
 */

#ifndef __REFERENCE_H__
#define __REFERENCE_H__

/*
 * Reference
 *
 * A basic reference counting pointer
 */
template<typename C>
class Reference
{
public:
	Reference()
		{ m_ptr = NULL; }

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

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

/*
 * Instance
 *
 * A basic reference counted object.
 */
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__