The Tor Browser / file comparison
comparison: content/base/src/nsStubMutationObserver.h
content/base/src/nsStubMutationObserver.h
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| 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/. */ | |
| 5 | |
| 6 /* | |
| 7 * nsStubMutationObserver is an implementation of the nsIMutationObserver | |
| 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 */ | |
| 12 | |
| 13 #ifndef nsStubMutationObserver_h_ | |
| 14 #define nsStubMutationObserver_h_ | |
| 15 | |
| 16 #include "nsIMutationObserver.h" | |
| 17 | |
| 18 /** | |
| 19 * There are two advantages to inheriting from nsStubMutationObserver | |
| 20 * rather than directly from nsIMutationObserver: | |
| 21 * 1. smaller compiled code size (since there's no need for the code | |
| 22 * for the empty virtual function implementations for every | |
| 23 * nsIMutationObserver 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 nsStubMutationObserver : public nsIMutationObserver { | |
| 30 public: | |
| 31 NS_DECL_NSIMUTATIONOBSERVER | |
| 32 }; | |
| 33 | |
| 34 #endif /* !defined(nsStubMutationObserver_h_) */ |
