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64a2c8bb8f
Differential Revision: https://phabricator.services.mozilla.com/D63961 --HG-- extra : moz-landing-system : lando
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsWeakReference_h__
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#define nsWeakReference_h__
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// nsWeakReference.h
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// See mfbt/WeakPtr.h for a more typesafe C++ implementation of weak references
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#include "nsIWeakReferenceUtils.h"
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class nsWeakReference;
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class nsSupportsWeakReference : public nsISupportsWeakReference {
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public:
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nsSupportsWeakReference() : mProxy(0) {}
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NS_DECL_NSISUPPORTSWEAKREFERENCE
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protected:
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inline ~nsSupportsWeakReference();
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private:
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friend class nsWeakReference;
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// Called (only) by an |nsWeakReference| from _its_ dtor.
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// The thread safety check is made by the caller.
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void NoticeProxyDestruction() { mProxy = nullptr; }
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nsWeakReference* MOZ_NON_OWNING_REF mProxy;
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protected:
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void ClearWeakReferences();
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bool HasWeakReferences() const { return !!mProxy; }
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};
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inline nsSupportsWeakReference::~nsSupportsWeakReference() {
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ClearWeakReferences();
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}
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#define NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE \
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tmp->ClearWeakReferences();
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#define NS_IMPL_CYCLE_COLLECTION_WEAK(class_, ...) \
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NS_IMPL_CYCLE_COLLECTION_CLASS(class_) \
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(class_) \
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NS_IMPL_CYCLE_COLLECTION_UNLINK(__VA_ARGS__) \
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NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE \
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END \
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(class_) \
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(__VA_ARGS__) \
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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#define NS_IMPL_CYCLE_COLLECTION_WEAK_INHERITED(class_, super_, ...) \
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NS_IMPL_CYCLE_COLLECTION_CLASS(class_) \
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(class_, super_) \
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NS_IMPL_CYCLE_COLLECTION_UNLINK(__VA_ARGS__) \
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NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE \
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END \
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(class_, super_) \
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(__VA_ARGS__) \
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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#endif
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