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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__