hash.h

// -*- Mode: C++; tab-width: 2; -*-
// vi: set ts=2:
//
// $Id: hash.h,v 1.23 2005/12/23 17:01:39 amoll Exp $
//

#ifndef BALL_COMMON_HASH_H
#define BALL_COMMON_HASH_H

#ifndef BALL_COMMON_H
# include <BALL/common.h>
#endif

#ifndef BALL_DATATYPE_STRING_H
# include <BALL/DATATYPE/string.h>
#endif

namespace BALL 
{
  template <typename T>
  class HashFunction
  {
    public:
    
    HashIndex operator () (const T& t) const
    {
      return Hash(t);
    }
  };

  
  BALL_EXPORT extern HashIndex hashPointer(void *const ptr);

  BALL_EXPORT extern HashIndex hashString(const char* str);

  BALL_EXPORT extern HashIndex hashPJWString(const char* str);

  BALL_EXPORT extern HashIndex hashElfString(const char* str);

  template <typename T>
  inline HashIndex Hash(const T& key)
  {
    return static_cast<HashIndex>((PointerSizeUInt)key);
  }

  BALL_EXPORT inline HashIndex Hash(const string& s)
  {
    return hashString(s.c_str());
  }

  BALL_EXPORT inline HashIndex Hash(const String& s)
  {
    return hashString(s.c_str());
  }

  BALL_EXPORT inline HashIndex Hash(void *const& ptr)
  {
    return hashPointer(ptr);
  }

    

  BALL_EXPORT HashIndex getNextPrime(HashIndex l);


} // namespace BALL

#endif // BALL_COMMON_HASH_H

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