nsWeakReference.h - mozsearch

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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;

class nsSupportsWeakReference : public nsISupportsWeakReference {

 public:

  nsSupportsWeakReference() : mProxy(0) {}

  NS_DECL_NSISUPPORTSWEAKREFERENCE

 protected:

  inline ~nsSupportsWeakReference();

 private:

  friend class nsWeakReference;

  // Called (only) by an |nsWeakReference| from _its_ dtor.

  // The thread safety check is made by the caller.

  void NoticeProxyDestruction() { mProxy = nullptr; }

  nsWeakReference* MOZ_NON_OWNING_REF mProxy;

 protected:

  void ClearWeakReferences();

  bool HasWeakReferences() const { return !!mProxy; }

};

inline nsSupportsWeakReference::~nsSupportsWeakReference() {

  ClearWeakReferences();

#define NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE \

  tmp->ClearWeakReferences();

#define NS_IMPL_CYCLE_COLLECTION_WEAK(class_, ...) \

  NS_IMPL_CYCLE_COLLECTION_CLASS(class_)           \

  NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(class_)    \

    NS_IMPL_CYCLE_COLLECTION_UNLINK(__VA_ARGS__)   \

    NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE \

  NS_IMPL_CYCLE_COLLECTION_UNLINK_END              \

  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(class_)  \

    NS_IMPL_CYCLE_COLLECTION_TRAVERSE(__VA_ARGS__) \

  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

#define NS_IMPL_CYCLE_COLLECTION_WEAK_INHERITED(class_, super_, ...) \

  NS_IMPL_CYCLE_COLLECTION_CLASS(class_)                             \

  NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(class_, super_)    \

    NS_IMPL_CYCLE_COLLECTION_UNLINK(__VA_ARGS__)                     \

    NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE                   \

  NS_IMPL_CYCLE_COLLECTION_UNLINK_END                                \

  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(class_, super_)  \

    NS_IMPL_CYCLE_COLLECTION_TRAVERSE(__VA_ARGS__)                   \

  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

#endif