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| -rw-r--r-- | src/libs/xpcom18a4/xpcom/base/nsIWeakReference.idl | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/base/nsIWeakReference.idl b/src/libs/xpcom18a4/xpcom/base/nsIWeakReference.idl new file mode 100644 index 00000000..2806fc8a --- /dev/null +++ b/src/libs/xpcom18a4/xpcom/base/nsIWeakReference.idl @@ -0,0 +1,102 @@ +/* -*- Mode: IDL; tab-width: 2; 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 the Mozilla browser. + * + * The Initial Developer of the Original Code is + * Netscape Communications, Inc. + * Portions created by the Initial Developer are Copyright (C) 1999 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * Pierre Phaneuf <pp@ludusdesign.com> + * + * Alternatively, the contents of this file may be used under the terms of + * either of 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 ***** */ + +#include "nsISupports.idl" + + +/** + * An instance of |nsIWeakReference| is a proxy object that cooperates with + * its referent to give clients a non-owning, non-dangling reference. Clients + * own the proxy, and should generally manage it with an |nsCOMPtr| (see the + * type |nsWeakPtr| for a |typedef| name that stands out) as they would any + * other XPCOM object. The |QueryReferent| member function provides a + * (hopefully short-lived) owning reference on demand, through which clients + * can get useful access to the referent, while it still exists. + * + * @status FROZEN + * @version 1.0 + * @see nsISupportsWeakReference + * @see nsWeakReference + * @see nsWeakPtr + */ +[scriptable, uuid(9188bc85-f92e-11d2-81ef-0060083a0bcf)] +interface nsIWeakReference : nsISupports + { + /** + * |QueryReferent| queries the referent, if it exists, and like |QueryInterface|, produces + * an owning reference to the desired interface. It is designed to look and act exactly + * like (a proxied) |QueryInterface|. Don't hold on to the produced interface permanently; + * that would defeat the purpose of using a non-owning |nsIWeakReference| in the first place. + */ + void QueryReferent( in nsIIDRef uuid, [iid_is(uuid), retval] out nsQIResult result ); + }; + + +/** + * |nsISupportsWeakReference| is a factory interface which produces appropriate + * instances of |nsIWeakReference|. Weak references in this scheme can only be + * produced for objects that implement this interface. + * + * @status FROZEN + * @version 1.0 + * @see nsIWeakReference + * @see nsSupportsWeakReference + */ +[scriptable, uuid(9188bc86-f92e-11d2-81ef-0060083a0bcf)] +interface nsISupportsWeakReference : nsISupports + { + /** + * |GetWeakReference| produces an appropriate instance of |nsIWeakReference|. + * As with all good XPCOM `getters', you own the resulting interface and should + * manage it with an |nsCOMPtr|. + * + * @see nsIWeakReference + * @see nsWeakPtr + * @see nsCOMPtr + */ + nsIWeakReference GetWeakReference(); + }; + + +%{C++ +#ifndef MOZILLA_STRICT_API +#include "nsIWeakReferenceUtils.h" +#endif +%} + |