serge-sans-paille
fac0f5e1a8
Differential Revision: https://phabricator.services.mozilla.com/D301767
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
/* 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(nullptr) {}
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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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