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