third_party/WebKit/Source/platform/geometry/IntSizeHash.h

   1 /*
   2  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
   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 "platform/geometry/IntSize.h"
  24 #include "wtf/HashMap.h"
  25 #include "wtf/HashSet.h"
  26
  27 namespace WTF {
  28
  29 template<> struct IntHash<blink::IntSize> {
  30     static unsigned hash(const blink::IntSize& key) { return pairIntHash(key.width(), key.height()); }
  31     static bool equal(const blink::IntSize& a, const blink::IntSize& b) { return a == b; }
  32     static const bool safeToCompareToEmptyOrDeleted = true;
  33 };
  34
  35 template<> struct DefaultHash<blink::IntSize> {
  36     typedef IntHash<blink::IntSize> Hash;
  37 };
  38
  39 template<> struct HashTraits<blink::IntSize> : GenericHashTraits<blink::IntSize> {
  40     static const bool emptyValueIsZero = true;
  41     static void constructDeletedValue(blink::IntSize& slot, bool) { new (NotNull, &slot) blink::IntSize(-1, -1); }
  42     static bool isDeletedValue(const blink::IntSize& value) { return value.width() == -1 && value.height() == -1; }
  43 };
  44
  45 } // namespace WTF
  46
  47 #endif