mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
69 lines
2.9 KiB
C++
69 lines
2.9 KiB
C++
/*
|
|
* 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 Computer, 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 SKY_ENGINE_WTF_TEXT_ATOMICSTRINGHASH_H_
|
|
#define SKY_ENGINE_WTF_TEXT_ATOMICSTRINGHASH_H_
|
|
|
|
#include "sky/engine/wtf/HashTraits.h"
|
|
#include "sky/engine/wtf/text/AtomicString.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;
|
|
};
|
|
|
|
// AtomicStringHash is the default hash for AtomicString
|
|
template<> struct HashTraits<WTF::AtomicString> : GenericHashTraits<WTF::AtomicString> {
|
|
// Unlike other types, we can return a const reference for AtomicString's empty value (nullAtom).
|
|
typedef const WTF::AtomicString& PeekOutType;
|
|
|
|
static const WTF::AtomicString& emptyValue() { return nullAtom; }
|
|
static PeekOutType peek(const WTF::AtomicString& value) { return value; }
|
|
|
|
static const bool emptyValueIsZero = true;
|
|
static void constructDeletedValue(WTF::AtomicString& slot, bool) { new (NotNull, &slot) WTF::AtomicString(HashTableDeletedValue); }
|
|
static bool isDeletedValue(const WTF::AtomicString& slot) { return slot.isHashTableDeletedValue(); }
|
|
};
|
|
|
|
}
|
|
|
|
using WTF::AtomicStringHash;
|
|
|
|
#endif // SKY_ENGINE_WTF_TEXT_ATOMICSTRINGHASH_H_
|