1 /* 2 Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) 3 4 This library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Library General Public 6 License as published by the Free Software Foundation; either 7 version 2 of the License, or (at your option) any later version. 8 9 This library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Library General Public License for more details. 13 14 You should have received a copy of the GNU Library General Public License 15 along with this library; see the file COPYING.LIB. If not, write to 16 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 Boston, MA 02110-1301, USA. 18 */ 19 20 #ifndef IntPointHash_h 21 #define IntPointHash_h 22 23 #include "IntPoint.h" 24 #include <wtf/HashFunctions.h> 25 #include <wtf/HashTraits.h> 26 27 namespace WTF { 28 29 // The empty value is (0, INT_MIN), the deleted value is (INT_MIN, 0) 30 struct IntPointHash { hashIntPointHash31 static unsigned hash(const WebCore::IntPoint& p) { return WTF::intHash(static_cast<uint64_t>(p.x()) << 32 | p.y()); } equalIntPointHash32 static bool equal(const WebCore::IntPoint& a, const WebCore::IntPoint& b) { return a == b; } 33 static const bool safeToCompareToEmptyOrDeleted = true; 34 }; 35 template<> struct HashTraits<WebCore::IntPoint> : GenericHashTraits<WebCore::IntPoint> { 36 static const bool needsDestruction = false; 37 static WebCore::IntPoint emptyValue() { return WebCore::IntPoint(0, std::numeric_limits<int>::min()); } 38 39 static void constructDeletedValue(WebCore::IntPoint& slot) { slot = WebCore::IntPoint(std::numeric_limits<int>::min(), 0); } 40 static bool isDeletedValue(const WebCore::IntPoint& slot) { return slot == WebCore::IntPoint(std::numeric_limits<int>::min(), 0); } 41 }; 42 template<> struct DefaultHash<WebCore::IntPoint> { 43 typedef IntPointHash Hash; 44 }; 45 46 } 47 48 #endif 49