michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  *
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef nsWeakReference_h__
michael@0: #define nsWeakReference_h__
michael@0: 
michael@0: // nsWeakReference.h
michael@0: 
michael@0: // See mfbt/WeakPtr.h for a more typesafe C++ implementation of weak references
michael@0: 
michael@0: #include "nsIWeakReferenceUtils.h"
michael@0: 
michael@0: class nsWeakReference;
michael@0: 
michael@0: // Set IMETHOD_VISIBILITY to empty so that the class-level NS_COM declaration
michael@0: // controls member method visibility.
michael@0: #undef  IMETHOD_VISIBILITY
michael@0: #define IMETHOD_VISIBILITY NS_COM_GLUE
michael@0: 
michael@0: class NS_COM_GLUE nsSupportsWeakReference : public nsISupportsWeakReference
michael@0:   {
michael@0:     public:
michael@0:       nsSupportsWeakReference()
michael@0:           : mProxy(0)
michael@0:         {
michael@0:           // nothing else to do here
michael@0:         }
michael@0: 
michael@0:       NS_DECL_NSISUPPORTSWEAKREFERENCE
michael@0: 
michael@0:     protected:
michael@0:       inline ~nsSupportsWeakReference();
michael@0: 
michael@0:     private:
michael@0:       friend class nsWeakReference;
michael@0: 
michael@0:       void
michael@0:       NoticeProxyDestruction()
michael@0:           // ...called (only) by an |nsWeakReference| from _its_ dtor.
michael@0:         {
michael@0:           mProxy = 0;
michael@0:         }
michael@0: 
michael@0:       nsWeakReference* mProxy;
michael@0: 
michael@0: 		protected:
michael@0: 
michael@0: 			void ClearWeakReferences();
michael@0: 			bool HasWeakReferences() const {return mProxy != 0;}
michael@0:   };
michael@0: 
michael@0: #undef  IMETHOD_VISIBILITY
michael@0: #define IMETHOD_VISIBILITY NS_VISIBILITY_HIDDEN
michael@0: 
michael@0: inline
michael@0: nsSupportsWeakReference::~nsSupportsWeakReference()
michael@0:   {
michael@0:   	ClearWeakReferences();
michael@0:   }
michael@0: 
michael@0: #endif