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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 #ifndef __CS_UTIL_HASHR_H__
00025 #define __CS_UTIL_HASHR_H__
00026 
00027 #include "csutil/hash.h"
00028  
00032 
00033 template <class T, class K = unsigned int> 
00034 class csHashReversible : public csHash<T, K>
00035 {
00036   csHash<K, T> reverse;
00037 public:
00051   csHashReversible (int size = 23, int grow_rate = 5, int max_size = 20000) :
00052     csHash<T, K> (size, grow_rate, max_size), 
00053     reverse (size, grow_rate, max_size)
00054   {
00055   }
00059   void Put (const K& key, const T &value)
00060   {
00061     csHash<T, K>::Put (key, value);
00062     reverse.Put (value, key);
00063   }
00064 
00069   void PutUnique (const K& key, const T &value)
00070   {
00071     csHash<T, K>::PutUnique (key, value);
00072     reverse.PutUnique (value, key);
00073   }
00074 
00079   const K* GetKeyPointer (const T& key) const
00080   {
00081     return reverse.GetElementPointer (key);
00082   }
00083  
00088   const K& GetKey (const T& key, const K& fallback) const
00089   {
00090     return reverse.Get (key, fallback);
00091   }
00092 };
00093 
00096 #endif // __CS_UTIL_HASHR_H__

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