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/*
* Copyright (C) 2009, 2010, 2011, 2012 Research In Motion Limited. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef TileIndexHash_h
#define TileIndexHash_h
#include "TileIndex.h"
#include <limits>
#include <wtf/HashMap.h>
using BlackBerry::WebKit::TileIndex;
namespace WTF {
template<> struct IntHash<TileIndex> {
static unsigned hash(const TileIndex& key) { return pairIntHash(key.i(), key.j()); }
static bool equal(const TileIndex& a, const TileIndex& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = true;
};
template<> struct DefaultHash<TileIndex> {
typedef IntHash<TileIndex> Hash;
};
template<> struct HashTraits<TileIndex> : GenericHashTraits<TileIndex> {
static const bool emptyValueIsZero = false;
static const bool needsDestruction = false;
static TileIndex emptyValue() { return TileIndex(); }
static void constructDeletedValue(TileIndex& slot)
{
new (&slot) TileIndex(std::numeric_limits<unsigned>::max() - 1, std::numeric_limits<unsigned>::max() - 1);
}
static bool isDeletedValue(const TileIndex& value)
{
return value.i() == (std::numeric_limits<unsigned>::max() - 1) && value.j() == (std::numeric_limits<unsigned>::max() - 1);
}
};
} // namespace WTF
#endif // TileIndexHash_h
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