mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
117 lines
4.2 KiB
C++
117 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is Places code.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Google Inc.
|
|
* Portions created by the Initial Developer are Copyright (C) 2005
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Brian Ryner <bryner@brianryner.com> (original author)
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
#ifndef nsMaybeWeakPtr_h_
|
|
#define nsMaybeWeakPtr_h_
|
|
|
|
#include "nsCOMPtr.h"
|
|
#include "nsWeakReference.h"
|
|
#include "nsTArray.h"
|
|
|
|
// nsMaybeWeakPtr is a helper object to hold a strong-or-weak reference
|
|
// to the template class. It's pretty minimal, but sufficient.
|
|
|
|
class nsMaybeWeakPtr_base
|
|
{
|
|
protected:
|
|
// Returns an addref'd pointer to the requested interface
|
|
void* GetValueAs(const nsIID& iid) const;
|
|
|
|
nsCOMPtr<nsISupports> mPtr;
|
|
};
|
|
|
|
template<class T>
|
|
class nsMaybeWeakPtr : private nsMaybeWeakPtr_base
|
|
{
|
|
public:
|
|
nsMaybeWeakPtr(nsISupports *ref) { mPtr = ref; }
|
|
nsMaybeWeakPtr(const nsCOMPtr<nsIWeakReference> &ref) { mPtr = ref; }
|
|
nsMaybeWeakPtr(const nsCOMPtr<T> &ref) { mPtr = ref; }
|
|
|
|
bool operator==(const nsMaybeWeakPtr<T> &other) const {
|
|
return mPtr == other.mPtr;
|
|
}
|
|
|
|
operator const nsCOMPtr<T>() const { return GetValue(); }
|
|
|
|
protected:
|
|
const nsCOMPtr<T> GetValue() const {
|
|
return nsCOMPtr<T>(dont_AddRef(static_cast<T*>
|
|
(GetValueAs(NS_GET_TEMPLATE_IID(T)))));
|
|
}
|
|
};
|
|
|
|
// nsMaybeWeakPtrArray is an array of MaybeWeakPtr objects, that knows how to
|
|
// grab a weak reference to a given object if requested. It only allows a
|
|
// given object to appear in the array once.
|
|
|
|
typedef nsTArray< nsMaybeWeakPtr<nsISupports> > isupports_array_type;
|
|
nsresult NS_AppendWeakElementBase(isupports_array_type *aArray,
|
|
nsISupports *aElement, bool aWeak);
|
|
nsresult NS_RemoveWeakElementBase(isupports_array_type *aArray,
|
|
nsISupports *aElement);
|
|
|
|
template<class T>
|
|
class nsMaybeWeakPtrArray : public nsTArray< nsMaybeWeakPtr<T> >
|
|
{
|
|
public:
|
|
nsresult AppendWeakElement(T *aElement, bool aOwnsWeak)
|
|
{
|
|
return NS_AppendWeakElementBase(
|
|
reinterpret_cast<isupports_array_type*>(this), aElement, aOwnsWeak);
|
|
}
|
|
|
|
nsresult RemoveWeakElement(T *aElement)
|
|
{
|
|
return NS_RemoveWeakElementBase(
|
|
reinterpret_cast<isupports_array_type*>(this), aElement);
|
|
}
|
|
};
|
|
|
|
// Call a method on each element in the array, but only if the element is
|
|
// non-null.
|
|
|
|
#define ENUMERATE_WEAKARRAY(array, type, method) \
|
|
for (PRUint32 array_idx = 0; array_idx < array.Length(); ++array_idx) { \
|
|
const nsCOMPtr<type> &e = array.ElementAt(array_idx); \
|
|
if (e) \
|
|
e->method; \
|
|
}
|
|
|
|
#endif
|