зеркало из https://github.com/mozilla/gecko-dev.git
40 строки
1.2 KiB
C++
40 строки
1.2 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 nsStaticAtomUtils_h
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#define nsStaticAtomUtils_h
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#include <stdint.h>
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#include "nsAtom.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/Maybe.h"
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// This class holds basic operations on arrays of static atoms.
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class nsStaticAtomUtils
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{
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public:
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static mozilla::Maybe<uint32_t> Lookup(nsAtom* aAtom,
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const nsStaticAtom* aAtoms,
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uint32_t aCount)
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{
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if (aAtom->IsStatic()) {
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ptrdiff_t index = aAtom->AsStatic() - aAtoms;
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if (index >= 0 && index < static_cast<ptrdiff_t>(aCount)) {
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return mozilla::Some(static_cast<uint32_t>(index));
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}
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}
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return mozilla::Nothing();
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}
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static bool IsMember(nsAtom* aAtom, const nsStaticAtom* aAtoms,
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uint32_t aCount)
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{
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return Lookup(aAtom, aAtoms, aCount).isSome();
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}
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};
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#endif // nsStaticAtomUtils_h
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