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All classes deriving from nsIFrame that did not have any subclasses themselves (at the time of writing this patch) have been marked with `final`. Some other Layout classes have also been made final, but this was opportunistic while working on nsIFrame subclasses, and is definitely not exhaustive, further patches welcome; refer to bug 1332680. Advantages of marking a class final include: - Allowing the compiler to devirtualize some method calls (i.e., calling virtual functions directly instead of going through the vtable), - Indicating that the class is not currently subclassed, - Preventing subclassing without being aware that this would remove the finalization benefits of the parent class. `final` does not signify that these classes should *never* be subclassed, this is left for developers to decide. Differential Revision: https://phabricator.services.mozilla.com/D5020 --HG-- extra : moz-landing-system : lando
34 lines
1.0 KiB
C++
34 lines
1.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsMathMLsemanticsFrame_h___
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#define nsMathMLsemanticsFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsMathMLSelectedFrame.h"
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//
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// <semantics> -- associate annotations with a MathML expression
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//
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class nsMathMLsemanticsFrame final : public nsMathMLSelectedFrame
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{
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsMathMLsemanticsFrame)
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friend nsIFrame* NS_NewMathMLsemanticsFrame(nsIPresShell* aPresShell,
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ComputedStyle* aStyle);
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protected:
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explicit nsMathMLsemanticsFrame(ComputedStyle* aStyle) :
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nsMathMLSelectedFrame(aStyle, kClassID) {}
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virtual ~nsMathMLsemanticsFrame();
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nsIFrame* GetSelectedFrame() override;
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};
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#endif /* nsMathMLsemanticsFrame_h___ */
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