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BitSet.h

/*------------------------------------------------------------------------------
* Copyright (C) 2003-2006 Ben van Klinken and the CLucene Team
* 
* Distributable under the terms of either the Apache License (Version 2.0) or 
* the GNU Lesser General Public License, as specified in the COPYING file.
------------------------------------------------------------------------------*/
#ifndef _lucene_util_BitSet_
#define _lucene_util_BitSet_

#if defined(_LUCENE_PRAGMA_ONCE)
# pragma once
#endif

#include "CLucene/store/Directory.h"

CL_NS_DEF(util)
class BitSet:LUCENE_BASE {
      int32_t _size;
      int32_t _count;
      uint8_t *bits;
      
protected:
      BitSet( const BitSet& copy );

public:
      ///Create a bitset with the specified size
      BitSet ( int32_t size );
      BitSet(CL_NS(store)::Directory* d, const char* name);
      void write(CL_NS(store)::Directory* d, const char* name);
      
      ///Destructor for the bit set
      ~BitSet();
      
      ///get the value of the specified bit
      inline bool get(const int32_t bit) const{
            return (bits[bit >> 3] & (1 << (bit & 7))) != 0;
      }
      
      ///set the value of the specified bit
      void set(const int32_t bit, bool val=true);
      
      ///returns the size of the bitset
      int32_t size() const;
      
      /// Returns the total number of one bits in this BitSet.  This is efficiently
      ///   computed and cached, so that, if the BitSet is not changed, no
      ///   recomputation is done for repeated calls. 
      int32_t count();
      BitSet *clone() const;
};
CL_NS_END
#endif

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