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73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
/*
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* Copyright (C) 2008 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_WTF_TEXT_ATOMICSTRINGHASH_H_
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#define SKY_ENGINE_WTF_TEXT_ATOMICSTRINGHASH_H_
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#include "flutter/sky/engine/wtf/HashTraits.h"
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#include "flutter/sky/engine/wtf/text/AtomicString.h"
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namespace WTF {
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struct AtomicStringHash {
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static unsigned hash(const AtomicString& key) {
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return key.impl()->existingHash();
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}
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static bool equal(const AtomicString& a, const AtomicString& b) {
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return a == b;
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}
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static const bool safeToCompareToEmptyOrDeleted = false;
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};
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// AtomicStringHash is the default hash for AtomicString
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template <>
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struct HashTraits<WTF::AtomicString> : GenericHashTraits<WTF::AtomicString> {
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// Unlike other types, we can return a const reference for AtomicString's
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// empty value (nullAtom).
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typedef const WTF::AtomicString& PeekOutType;
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static const WTF::AtomicString& emptyValue() { return nullAtom; }
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static PeekOutType peek(const WTF::AtomicString& value) { return value; }
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static const bool emptyValueIsZero = true;
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static void constructDeletedValue(WTF::AtomicString& slot, bool) {
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new (NotNull, &slot) WTF::AtomicString(HashTableDeletedValue);
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}
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static bool isDeletedValue(const WTF::AtomicString& slot) {
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return slot.isHashTableDeletedValue();
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}
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};
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} // namespace WTF
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using WTF::AtomicStringHash;
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#endif // SKY_ENGINE_WTF_TEXT_ATOMICSTRINGHASH_H_
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