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/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is [Open Source Virtual Machine.].
 *
 * The Initial Developer of the Original Code is
 * Adobe System Incorporated.
 * Portions created by the Initial Developer are Copyright (C) 1993-2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Adobe AS3 Team
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

//
// GCWeakRef.h
// GC weak references (aka safe handles) as template classes
//

#ifndef _GC_WEAK_REF_H_
#define _GC_WEAK_REF_H_

namespace MMgc
{
	// new improved weak ref
	class GCWeakRef : public GCFinalizedObject
	{
		friend class GC;
	public:
		GCObject *get() { return (GCObject*)m_obj; }
		~GCWeakRef() 
		{ 
			if(m_obj) {
				GC::GetGC(this)->ClearWeakRef(m_obj); 
			}
		}
	private:
		/**
		 * When allocating a GCWeakRef, tell the GC we don't contain pointers
		 * (overriding the default base-class behavior).
		 */
		static void *operator new(size_t size, GC *gc)
		{
			return gc->Alloc(size, GC::kFinalize);
		}

		// private, only GC can access
		GCWeakRef(const void *obj) : m_obj(obj) 
		{
#ifdef MMGC_MEMORY_INFO
			obj_creation = obj;
#endif
		}
		const void *m_obj;
#ifdef MMGC_MEMORY_INFO
		const void* obj_creation;
#endif
	};

#if 0
	// something like this would be nice
	template<class T> class GCWeakRefPtr 
	{
		
	public:
		GCWeakRefPtr() {}
		GCWeakRefPtr(T t) {  set(t);}
		~GCWeakRefPtr() { t = NULL;	}

		T operator=(const GCWeakRefPtr<T>& wb)
		{
			return set(wb.t);	
		}

		T operator=(T tNew)
		{
			return set(tNew);
		}

		operator T() const { return (T) t->get(); }

		bool operator!=(T other) const { return other != t; }

		T operator->() const
		{
			return (T) t->get();
		}
	private:		
		T set(const T tNew)
		{
			t = tNew->GetWeakRef();
		}
		GCWeakRef* t;
	};
#endif
}

#endif // _GC_WEAK_REF_H_