gecko-dev/xpcom/glue/nsWeakReference.h
Jeff Muizelaar ac8fdf1333 Bug 792954. Add a WeakPtr implementation to use instead of nsISupportsWeakReference. r=joe,ehsan,Waldo
This patch also replaces the usage of nsISupportsWeakReference in RasterImage as an example.

--HG--
extra : rebase_source : ac6a039dcc3227a04ac4c2221f38856bb308c695
2012-10-04 15:45:07 -04:00

65 lines
1.5 KiB
C++

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