H:/gfcppsancout/product/include/gfcpp/HashFunction.hpp

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#ifndef _GEMFIRE_HASHFUNCTION_HPP_
#define _GEMFIRE_HASHFUNCTION_HPP_


/*=========================================================================
 * (c) Copyright 2002-2007, GemStone Systems, Inc. All Rights Reserved.
 * 1260 NW Waterhouse Ave., Suite 200,  Beaverton, OR 97006
 *========================================================================
 */

#include "gfcpp_globals.hpp"
#include "SharedPtr.hpp"
#include "CacheableKey.hpp"


namespace gemfire
{

  typedef size_t (*Hasher) ( const SharedBasePtr& );

  typedef bool (*EqualTo) ( const SharedBasePtr&, const SharedBasePtr& );


  class HashSB
  {
    private:

      Hasher m_hashFn;

      // Never defined.
      HashSB( );


    public:

      HashSB( const Hasher hashFn )
        : m_hashFn( hashFn )
      {
      }

      size_t operator () ( const SharedBasePtr& p ) const
      {
        return m_hashFn( p );
      }
  };


  class EqualToSB 
  {
    private:

      EqualTo m_equalFn;

      // Never defined.
      EqualToSB( );


    public:

      EqualToSB( const EqualTo equalFn)
        : m_equalFn( equalFn )
      {
      }

      bool operator () ( const SharedBasePtr& x, const SharedBasePtr& y ) const
      {
        return m_equalFn( x, y );
      }
  };


  template < typename TKEY >
  inline size_t hashFunction( const TKEY& k )
  {
    return k->hashcode( );
  }

  template < typename TKEY >
  inline bool equalToFunction( const TKEY& x, const TKEY& y )
  {
    return ( *x.ptr( ) == *y.ptr( ) );
  }

}


#endif

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