The Tor Browser: content/base/src/nsStubDocumentObserver.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

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

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /*

     7  * nsStubDocumentObserver is an implementation of the nsIDocumentObserver

     8  * interface (except for the methods on nsISupports) that is intended to be

     9  * used as a base class within the content/layout library.  All methods do

    10  * nothing.

    11  */

    13 #ifndef nsStubDocumentObserver_h_

    14 #define nsStubDocumentObserver_h_

    16 #include "nsIDocumentObserver.h"

    18 /**

    19  * There are two advantages to inheriting from nsStubDocumentObserver

    20  * rather than directly from nsIDocumentObserver:

    21  *  1. smaller compiled code size (since there's no need for the code

    22  *     for the empty virtual function implementations for every

    23  *     nsIDocumentObserver implementation)

    24  *  2. the performance of document's loop over observers benefits from

    25  *     the fact that more of the functions called are the same (which

    26  *     can reduce instruction cache misses and perhaps improve branch

    27  *     prediction)

    28  */

    29 class nsStubDocumentObserver : public nsIDocumentObserver {

    30 public:

    31   NS_DECL_NSIDOCUMENTOBSERVER

    32 };

    34 #endif /* !defined(nsStubDocumentObserver_h_) */

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