From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- dom/base/nsStubMutationObserver.h | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 dom/base/nsStubMutationObserver.h (limited to 'dom/base/nsStubMutationObserver.h') diff --git a/dom/base/nsStubMutationObserver.h b/dom/base/nsStubMutationObserver.h new file mode 100644 index 000000000..438a7ae69 --- /dev/null +++ b/dom/base/nsStubMutationObserver.h @@ -0,0 +1,35 @@ +/* -*- 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/. */ + +/* + * nsStubMutationObserver is an implementation of the nsIMutationObserver + * interface (except for the methods on nsISupports) that is intended to be + * used as a base class within the content/layout library. All methods do + * nothing. + */ + +#ifndef nsStubMutationObserver_h_ +#define nsStubMutationObserver_h_ + +#include "nsIMutationObserver.h" + +/** + * There are two advantages to inheriting from nsStubMutationObserver + * rather than directly from nsIMutationObserver: + * 1. smaller compiled code size (since there's no need for the code + * for the empty virtual function implementations for every + * nsIMutationObserver implementation) + * 2. the performance of document's loop over observers benefits from + * the fact that more of the functions called are the same (which + * can reduce instruction cache misses and perhaps improve branch + * prediction) + */ +class nsStubMutationObserver : public nsIMutationObserver { +public: + NS_DECL_NSIMUTATIONOBSERVER +}; + +#endif /* !defined(nsStubMutationObserver_h_) */ -- cgit v1.2.3