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csutil/hashr.h

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00001 /*
00002     Copyright (C) 2003 by Jorrit Tyberghein
00003               (C) 2003 by Frank Richter
00004 
00005     This library is free software; you can redistribute it and/or
00006     modify it under the terms of the GNU Library General Public
00007     License as published by the Free Software Foundation; either
00008     version 2 of the License, or (at your option) any later version.
00009 
00010     This library is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013     Library General Public License for more details.
00014 
00015     You should have received a copy of the GNU Library General Public
00016     License along with this library; if not, write to the Free
00017     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00018 */
00019 
00024 #include "csextern.h"
00025 #include "hash.h"
00026  
00028 template <class T, class K = uint32, 
00029   class KeyHandler = csIntegralHashKeyHandler<K>,
00030   class ReverseKeyHandler = csIntegralHashKeyHandler<T> > 
00031 class csHashReversible : public csHash<T, K, KeyHandler>
00032 {
00033   csHash<K, T, ReverseKeyHandler> reverse;
00034 public:
00048   csHashReversible (int size = 257, int grow_rate = 64, int max_size = 20000) :
00049     csHash<T, K, KeyHandler> (size, grow_rate, max_size), 
00050     reverse (size, grow_rate, max_size)
00051   {
00052   }
00056   void Put (const K& key, const T &value)
00057   {
00058     csHash<T, K, KeyHandler>::Put (key, value);
00059     reverse.Put (value, key);
00060   }
00061 
00066   const K* GetKeyPointer (const T& key) const
00067   {
00068     return reverse.GetElementPointer (key);
00069   }
00070  
00075   const K& GetKey (const T& key, const K& fallback) const
00076   {
00077     return reverse.Get (key, fallback);
00078   }
00079 };
00080 

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