KHtml

IntSizeHash.h
1 /*
2  * Copyright (C) 2006 Apple Computer, Inc.
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 IntSizeHash_h
21 #define IntSizeHash_h
22 
23 #include "IntSize.h"
24 #include <wtf/HashMap.h>
25 #include <wtf/HashSet.h>
26 
27 using WebCore::IntSize;
28 
29 namespace WTF
30 {
31 
32 template<> struct IntHash<IntSize> {
33  static unsigned hash(const IntSize &key)
34  {
35  return intHash((static_cast<uint64_t>(key.width()) << 32 | key.height()));
36  }
37  static bool equal(const IntSize &a, const IntSize &b)
38  {
39  return a == b;
40  }
41 
42  static const bool safeToCompareToEmptyOrDeleted = true;
43 };
44 template<> struct DefaultHash<IntSize> {
45  typedef IntHash<IntSize> Hash;
46 };
47 
48 template<> struct HashTraits<IntSize> : GenericHashTraits<IntSize> {
49  static const bool emptyValueIsZero = true;
50  static const bool needsDestruction = false;
51  static const bool needsRef = false;
52  static IntSize deletedValue()
53  {
54  return IntSize(-1, -1);
55  }
56 };
57 } // namespace WTF
58 
59 #endif
Definition: css_base.h:371
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