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112 lines
3.0 KiB
C++
112 lines
3.0 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1 (the
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* "License"); you may not use this file except in compliance with the License. You may obtain
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* a copy of the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis, WITHOUT
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* WARRANTY OF ANY KIND, either express or implied. See the License for the specific
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* language governing rights and limitations under the License.
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*
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* The Original Code is [Open Source Virtual Machine.]
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*
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* The Initial Developer of the Original Code is Adobe System Incorporated. Portions created
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* by the Initial Developer are Copyright (C)[ 1993-2006 ] Adobe Systems Incorporated. All Rights
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* Reserved.
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*
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* Contributor(s): Adobe AS3 Team
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*
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* Alternatively, the contents of this file may be used under the terms of either the GNU
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* General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public
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* License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the
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* LGPL are applicable instead of those above. If you wish to allow use of your version of this
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* file only under the terms of either the GPL or the LGPL, and not to allow others to use your
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* version of this file under the terms of the MPL, indicate your decision by deleting provisions
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* above and replace them with the notice and other provisions required by the GPL or the
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* LGPL. If you do not delete the provisions above, a recipient may use your version of this file
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* under the terms of any one of the MPL, the GPL or the LGPL.
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*
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***** END LICENSE BLOCK ***** */
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//
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// GCWeakRef.h
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// GC weak references (aka safe handles) as template classes
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//
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#ifndef _GC_WEAK_REF_H_
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#define _GC_WEAK_REF_H_
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namespace MMgc
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{
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// new improved weak ref
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class GCWeakRef : public GCFinalizedObject
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{
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friend class GC;
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public:
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GCObject *get() { return (GCObject*)m_obj; }
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~GCWeakRef()
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{
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if(m_obj) {
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GC::GetGC(this)->ClearWeakRef(m_obj);
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}
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}
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private:
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// override new so we can be tell the GC we don't contain pointers
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static void *operator new(size_t size, GC *gc)
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{
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return gc->Alloc(size, GC::kFinalize, 4);
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}
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// private, only GC can access
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GCWeakRef(const void *obj) : m_obj(obj)
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{
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#ifdef _DEBUG
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obj_creation = *((int*)GetRealPointer(obj)+1);
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#endif
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}
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const void *m_obj;
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#ifdef _DEBUG
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int obj_creation;
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#endif
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};
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#if 0
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// something like this would be nice
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template<class T> class GCWeakRefPtr
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{
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public:
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GCWeakRefPtr() {}
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GCWeakRefPtr(T t) { set(t);}
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~GCWeakRefPtr() { t = NULL; }
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T operator=(const GCWeakRefPtr<T>& wb)
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{
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return set(wb.t);
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}
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T operator=(T tNew)
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{
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return set(tNew);
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}
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operator T() const { return (T) t->get(); }
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bool operator!=(T other) const { return other != t; }
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T operator->() const
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{
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return (T) t->get();
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}
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private:
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T set(const T tNew)
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{
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t = tNew->GetWeakRef();
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}
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GCWeakRef* t;
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};
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#endif
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}
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#endif // _GC_WEAK_REF_H_
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