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/*
* Copyright (C) 2014 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 SessionIDHash_h
#define SessionIDHash_h
#include "SessionID.h"
#include <wtf/HashFunctions.h>
#include <wtf/HashTraits.h>
namespace WTF {
// The empty value is emptySessionID(), the deleted value is (-1)
struct SessionIDHash {
static unsigned hash(const WebCore::SessionID& p) { return (unsigned)p.sessionID(); }
static bool equal(const WebCore::SessionID& a, const WebCore::SessionID& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = true;
};
template<> struct HashTraits<WebCore::SessionID> : GenericHashTraits<WebCore::SessionID> {
static const bool needsDestruction = false;
static WebCore::SessionID emptyValue() { return WebCore::SessionID::emptySessionID(); }
static void constructDeletedValue(WebCore::SessionID& slot) { slot = WebCore::SessionID(-2); }
static bool isDeletedValue(const WebCore::SessionID& slot) { return slot == WebCore::SessionID(-2); }
};
template<> struct DefaultHash<WebCore::SessionID> {
typedef SessionIDHash Hash;
};
}
#endif // SessionIDHash_h
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