71 lines
2.7 KiB
C++
71 lines
2.7 KiB
C++
/*
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* Copyright (C) 2008-2019 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 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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#pragma once
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#include <wtf/text/AtomString.h>
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#include <wtf/HashTraits.h>
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namespace WTF {
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struct AtomStringHash {
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static unsigned hash(const AtomString& key)
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{
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return key.impl()->existingHash();
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}
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static bool equal(const AtomString& a, const AtomString& b)
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{
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return a == b;
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}
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static constexpr bool safeToCompareToEmptyOrDeleted = false;
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static constexpr bool hasHashInValue = true;
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};
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template<> struct HashTraits<WTF::AtomString> : SimpleClassHashTraits<WTF::AtomString> {
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static constexpr bool hasIsEmptyValueFunction = true;
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static bool isEmptyValue(const AtomString& value)
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{
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return value.isNull();
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}
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static void customDeleteBucket(AtomString& value)
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{
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// See unique_ptr's customDeleteBucket() for an explanation.
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ASSERT(!isDeletedValue(value));
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AtomString valueToBeDestroyed = WTFMove(value);
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constructDeletedValue(value);
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}
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};
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template<> struct DefaultHash<AtomString> : AtomStringHash { };
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}
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using WTF::AtomStringHash;
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