/* * 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