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
27namespace WTF {
28
29// The empty value is (0, INT_MIN), the deleted value is (INT_MIN, 0)
30struct IntPointHash {
31 static unsigned hash(const WebCore::IntPoint& p) { return pairIntHash(p.x(), p.y()); }
32 static bool equal(const WebCore::IntPoint& a, const WebCore::IntPoint& b) { return a == b; }
33 static const bool safeToCompareToEmptyOrDeleted = true;
34};
35template<> struct HashTraits<WebCore::IntPoint> : GenericHashTraits<WebCore::IntPoint> {
36 static WebCore::IntPoint emptyValue() { return WebCore::IntPoint(0, std::numeric_limits<int>::min()); }
37
38 static void constructDeletedValue(WebCore::IntPoint& slot) { slot = WebCore::IntPoint(std::numeric_limits<int>::min(), 0); }
39 static bool isDeletedValue(const WebCore::IntPoint& slot) { return slot == WebCore::IntPoint(std::numeric_limits<int>::min(), 0); }
40};
41template<> struct DefaultHash<WebCore::IntPoint> {
42 typedef IntPointHash Hash;
43};
44
45}
46
47#endif
48