1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/glue/nsWeakReference.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,64 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef nsWeakReference_h__
1.11 +#define nsWeakReference_h__
1.12 +
1.13 +// nsWeakReference.h
1.14 +
1.15 +// See mfbt/WeakPtr.h for a more typesafe C++ implementation of weak references
1.16 +
1.17 +#include "nsIWeakReferenceUtils.h"
1.18 +
1.19 +class nsWeakReference;
1.20 +
1.21 +// Set IMETHOD_VISIBILITY to empty so that the class-level NS_COM declaration
1.22 +// controls member method visibility.
1.23 +#undef IMETHOD_VISIBILITY
1.24 +#define IMETHOD_VISIBILITY NS_COM_GLUE
1.25 +
1.26 +class NS_COM_GLUE nsSupportsWeakReference : public nsISupportsWeakReference
1.27 + {
1.28 + public:
1.29 + nsSupportsWeakReference()
1.30 + : mProxy(0)
1.31 + {
1.32 + // nothing else to do here
1.33 + }
1.34 +
1.35 + NS_DECL_NSISUPPORTSWEAKREFERENCE
1.36 +
1.37 + protected:
1.38 + inline ~nsSupportsWeakReference();
1.39 +
1.40 + private:
1.41 + friend class nsWeakReference;
1.42 +
1.43 + void
1.44 + NoticeProxyDestruction()
1.45 + // ...called (only) by an |nsWeakReference| from _its_ dtor.
1.46 + {
1.47 + mProxy = 0;
1.48 + }
1.49 +
1.50 + nsWeakReference* mProxy;
1.51 +
1.52 + protected:
1.53 +
1.54 + void ClearWeakReferences();
1.55 + bool HasWeakReferences() const {return mProxy != 0;}
1.56 + };
1.57 +
1.58 +#undef IMETHOD_VISIBILITY
1.59 +#define IMETHOD_VISIBILITY NS_VISIBILITY_HIDDEN
1.60 +
1.61 +inline
1.62 +nsSupportsWeakReference::~nsSupportsWeakReference()
1.63 + {
1.64 + ClearWeakReferences();
1.65 + }
1.66 +
1.67 +#endif
