#ifndef FILE_HASHTABL
#define FILE_HASHTABL

/**************************************************************************/
/* File:   hashtabl.hh                                                    */
/* Author: Joachim Schoeberl                                              */
/* Date:   01. Jun. 95                                                    */
/**************************************************************************/

#include "table.hpp"

namespace netgen
{

/**
   Abstract data type HASHTABLE.
   Hash is done by one INDEX
*/
class BASE_INDEX_HASHTABLE
{
protected:
  /// keys are stored in this table
  TABLE<INDEX,1> hash;
  
public:
  ///
  BASE_INDEX_HASHTABLE (int size)
    : hash (size) { };
  
protected:
  ///
  int HashValue (const INDEX & ind) const
    {
      return ind % hash.Size() + 1;
    }

  ///
  int Position (int bnr, const INDEX & ind) const;
};

///
template <class T>
class INDEX_HASHTABLE : private BASE_INDEX_HASHTABLE
{
  ///
  TABLE<T,1> cont;
  
public: 
  ///
  inline INDEX_HASHTABLE (int size);
  ///
  inline void Set (const INDEX & hash, const T & acont);
  ///
  inline const T & Get (const INDEX & ahash) const;
  ///
  inline bool Used (const INDEX & ahash) const;
  ///
  inline int GetNBags () const;
  ///
  inline int GetBagSize (int bnr) const;
  ///
  inline void GetData (int bnr, int colnr, INDEX & ahash, T & acont) const;

  ///
  inline void PrintMemInfo (ostream & ost) const;
};










///
class BASE_INDEX_2_HASHTABLE
{
protected:
  ///
  TABLE<INDEX_2> hash;
  
public:
  ///
  BASE_INDEX_2_HASHTABLE () { ; } 

  BASE_INDEX_2_HASHTABLE (int size)
    : hash (size) { };

  ///
  void PrintStat (ostream & ost) const;
  void BaseSetSize(int s) {hash.SetSize(s);}
  //protected:
  ///
  int HashValue (const INDEX_2 & ind) const
    {
      return (ind.I1() + ind.I2()) % hash.Size() + 1;
    }
  ///
  int Position (int bnr, const INDEX_2 & ind) const
  {
    for (int i = 1; i <= hash.EntrySize (bnr); i++)
      if (hash.Get(bnr, i) == ind)
	return i;
    return 0;
  }
};


///
template <class T>
class INDEX_2_HASHTABLE : public BASE_INDEX_2_HASHTABLE
{
  ///
  TABLE<T> cont;
  
public:
  ///
  INDEX_2_HASHTABLE () { ; } 

 INDEX_2_HASHTABLE (int size)
   : BASE_INDEX_2_HASHTABLE (size), cont(size)
  { ; }  

  ///
  void SetSize(int s) 
  { 
    cont.SetSize(s); 
    BaseSetSize(s);
  }

  ///
  void Set (const INDEX_2 & ahash, const T & acont)
  {
    int bnr = HashValue (ahash);
      int pos = Position (bnr, ahash);
      if (pos)
	cont.Set (bnr, pos, acont);
      else
	{
	  hash.Add1 (bnr, ahash);
	  cont.Add1 (bnr, acont);
	}    
  }
  
  ///
  const T & Get (const INDEX_2 & ahash) const
  {
    int bnr = HashValue (ahash);
    int pos = Position (bnr, ahash);
    return cont.Get (bnr, pos);
  }

  T & Get (const INDEX_2 & ahash)
  {
    int bnr = HashValue (ahash);
    int pos = Position (bnr, ahash);
    return cont.Get (bnr, pos);
  }

  ///
  bool Used (const INDEX_2 & ahash) const
  {
    return Position (HashValue (ahash), ahash) > 0;
  }
 ///
  int GetNBags () const
  {
    return cont.Size();
  }
  
  ///
  int GetBagSize (int bnr) const
  {
    return cont.EntrySize (bnr);
  }
    
  ///
  void GetData (int bnr, int colnr, 
		INDEX_2 & ahash, T & acont) const
  {
    ahash = hash.Get(bnr, colnr);
    acont = cont.Get(bnr, colnr);
  }

  ///
  void SetData (int bnr, int colnr, 
		const INDEX_2 & ahash, const T & acont) 
  {
    hash.Set(bnr, colnr, ahash);
    cont.Set(bnr, colnr, acont);
  }
  
  ///
  void PrintMemInfo (ostream & ost) const
  {
    ost << "Hash: " << endl;
    hash.PrintMemInfo (ost);
    ost << "Cont: " << endl;
    cont.PrintMemInfo (ost);
  }


  void DeleteData ()
  {
    int n = hash.Size();
    hash.SetSize (n);
    cont.SetSize (n);
  }


  class Iterator
  {
    const INDEX_2_HASHTABLE & ht;    
    int bagnr, pos;
  public:
    Iterator (const INDEX_2_HASHTABLE & aht,
	      int abagnr, int apos)
      : ht(aht), bagnr(abagnr), pos(apos)
    { ; }

    int BagNr() const { return bagnr; }
    int Pos() const { return pos; }

    Iterator operator++ (int)
    {
      Iterator it(ht, bagnr, pos);
      ++(*this);
      return it;
    }
    Iterator& operator++()
    {
      pos++;
      while (bagnr < ht.GetNBags() && 
	     pos == ht.GetBagSize(bagnr+1))
	{
	  pos = 0;
	  bagnr++;
	}
      return *this;
    }

    std::pair<INDEX_2, T> operator*()
    {
      return std::make_pair(ht.hash[bagnr][pos], ht.cont[bagnr][pos]);
    }

    bool operator != (int i) const
    {
      return bagnr != i;
    }

  };
  
  Iterator Begin () const
  {
    Iterator it(*this, 0, -1);
    it++;
    return it;
  }

  int End() const
  {
    return GetNBags();
  }

  Iterator begin () const
  {
    Iterator it(*this, 0, -1);
    it++;
    return it;
  }

  int end() const
  {
    return GetNBags();
  }

  void GetData (const Iterator & it,
		INDEX_2 & ahash, T & acont) const
  {
    ahash = hash[it.BagNr()][it.Pos()];
    acont = cont[it.BagNr()][it.Pos()];
  }

  const INDEX_2 & GetHash (const Iterator & it) const
  { return hash[it.BagNr()][it.Pos()]; }

  const T & GetData (const Iterator & it) const
  { return cont[it.BagNr()][it.Pos()]; }

  void DoArchive (Archive & ar)
  {
    ar & hash & cont;
  }    
  
};

template <typename T> 
inline ostream & operator<< (ostream & ost, const INDEX_2_HASHTABLE<T> & ht)
{
  for (typename INDEX_2_HASHTABLE<T>::Iterator it = ht.Begin();
       it != ht.End(); it++)
    {
      ost << ht.GetHash(it) << ": " << ht.GetData(it) << endl;
    }

  return ost;
}







///
class BASE_INDEX_3_HASHTABLE
{
protected:
  ///
  TABLE<INDEX_3> hash;

public:
  ///
  BASE_INDEX_3_HASHTABLE () { ; } 
  BASE_INDEX_3_HASHTABLE (int size)
    : hash (size) { };

protected:
  ///
  int HashValue (const INDEX_3 & ind) const
    {
      return (ind.I1() + ind.I2() + ind.I3()) % hash.Size() + 1;
    }

  ///
  int Position (int bnr, const INDEX_3 & ind) const
  {
    const INDEX_3 * pi = &hash.Get(bnr, 1);
    int n = hash.EntrySize(bnr);
    for (int i = 1; i <= n; ++i, ++pi)
      {
	if (*pi == ind)
	return i;
      }
    
    return 0;
  }


};


///
template <class T>
class INDEX_3_HASHTABLE : private BASE_INDEX_3_HASHTABLE
{
  ///
  TABLE<T> cont;

public:
  ///
  inline INDEX_3_HASHTABLE () { ; }
  inline INDEX_3_HASHTABLE (int size);
  ///
  inline void Set (const INDEX_3 & ahash, const T & acont);
  ///
  inline const T & Get (const INDEX_3 & ahash) const;
  ///
  inline bool Used (const INDEX_3 & ahash) const;
  ///
  inline int GetNBags () const;
  ///
  inline int GetBagSize (int bnr) const;
  ///
  inline void SetData (int bnr, int colnr, const INDEX_3 & ahash, const T & acont);
  ///
  inline void GetData (int bnr, int colnr, INDEX_3 & ahash, T & acont) const;
  /// returns position, if not existing, will create (create == return 1)
  inline int PositionCreate (const INDEX_3 & ahash, int & bnr, int & colnr);
  ///
  inline void SetSize (int size);

  ///
  inline void PrepareSet (const INDEX_3 & ahash);
  ///
  inline void AllocateElements ();

  ///
  inline void PrintMemInfo (ostream & ost) const;
  ///
  inline void DeleteData ();









  class Iterator
  {
    const INDEX_3_HASHTABLE & ht;    
    int bagnr, pos;
  public:
    Iterator (const INDEX_3_HASHTABLE & aht,
	      int abagnr, int apos)
      : ht(aht), bagnr(abagnr), pos(apos)
    { ; }

    int BagNr() const { return bagnr; }
    int Pos() const { return pos; }

    Iterator operator++ (int)
    {
      Iterator it(ht, bagnr, pos);
      ++(*this);
      return it;
    }
    Iterator& operator++()
    {
      pos++;
      while (bagnr < ht.GetNBags() && 
	     pos == ht.GetBagSize(bagnr+1))
	{
	  pos = 0;
	  bagnr++;
	}
      return *this;
    }

    std::pair<INDEX_3, T> operator*()
    {
      return std::make_pair(ht.hash[bagnr][pos], ht.cont[bagnr][pos]);
    }

    bool operator != (int i) const
    {
      return bagnr != i;
    }

  };
  
  Iterator Begin () const
  {
    Iterator it(*this, 0, -1);
    it++;
    return it;
  }

  int End() const
  {
    return GetNBags();
  }

  Iterator begin () const
  {
    Iterator it(*this, 0, -1);
    it++;
    return it;
  }

  int end() const
  {
    return GetNBags();
  }

  void GetData (const Iterator & it,
		INDEX_3 & ahash, T & acont) const
  {
    ahash = hash[it.BagNr()][it.Pos()];
    acont = cont[it.BagNr()][it.Pos()];
  }

  const INDEX_3 & GetHash (const Iterator & it) const
  { return hash[it.BagNr()][it.Pos()]; }

  const T & GetData (const Iterator & it) const
  { return cont[it.BagNr()][it.Pos()]; }


  void DoArchive (Archive & ar)
  {
    ar & hash & cont;
  }    


};


template <typename T> 
inline ostream & operator<< (ostream & ost, const INDEX_3_HASHTABLE<T> & ht)
{
  for (typename INDEX_3_HASHTABLE<T>::Iterator it = ht.Begin();
       it != ht.End(); it++)
    {
      ost << ht.GetHash(it) << ": " << ht.GetData(it) << endl;
    }

  return ost;
}
























/// Closed Hashing HT

class BASE_INDEX_CLOSED_HASHTABLE
{
protected:
  ///
  // MoveableArray<INDEX> hash;
  NgArray<INDEX> hash;
  ///
  int invalid;
public:
  ///
  BASE_INDEX_CLOSED_HASHTABLE (int size);

  int Size() const { return hash.Size(); }
  int UsedPos (int pos) const { return ! (hash.Get(pos) == invalid); }
  int UsedElements () const;

  ///
  int HashValue (const INDEX & ind) const
  {
    return (3*ind) % hash.Size() + 1;
  }


  int Position (const INDEX & ind) const
  {
    int i = HashValue(ind);
    while (1)
      {
	if (hash.Get(i) == ind) return i;
	if (hash.Get(i) == invalid) return 0;
	i++;
	if (i > hash.Size()) i = 1;
      }
  }

  int CalcPositionCosts (const INDEX & ind) const
  {
    int i = HashValue(ind);
    int costs = 1;
    while (1)
      {
	if (hash.Get(i) == ind) return costs;
	if (hash.Get(i) == invalid) return costs;
	i++;
	if (i > hash.Size()) i = 1;
	costs++;
      }
  }



  // returns 1, if new position is created
  int PositionCreate (const INDEX & ind, int & apos)
  {
    int i = HashValue (ind);
    if (hash.Get(i) == ind) 
      {
	apos = i;
	return 0;
      }
    if (hash.Get(i) == invalid)
      {
	hash.Elem(i) = ind; 
	apos = i;
	return 1;
      }
    return PositionCreate2 (ind, apos);    
  }

protected:
  int Position2 (const INDEX & ind) const;
  int PositionCreate2 (const INDEX & ind, int & apos);
  void BaseSetSize (int asize);
};


template <class T>
class INDEX_CLOSED_HASHTABLE : public BASE_INDEX_CLOSED_HASHTABLE
{
  ///
// MoveableArray<T> cont;
  NgArray<T> cont;

public:
  ///
  INDEX_CLOSED_HASHTABLE (int size)
    : BASE_INDEX_CLOSED_HASHTABLE(size), cont(size)
  {
    ; // cont.SetName ("ind-hashtable, contents");
  }


  void Set (const INDEX & ahash, const T & acont)
  {
    int pos;
    PositionCreate (ahash, pos);
    hash.Elem(pos) = ahash;
    cont.Elem(pos) = acont;
  }

  const T & Get (const INDEX & ahash) const
  {
    int pos = Position (ahash);
    return cont.Get(pos);
  }

  ///
  bool Used (const INDEX & ahash) const
  {
    int pos = Position (ahash);
    return (pos != 0);
  }
  
  
  ///
  inline void SetData (int pos, const INDEX & ahash, const T & acont)
  {
    hash.Elem(pos) = ahash;
    cont.Elem(pos) = acont;
  }

  ///
  void GetData (int pos, INDEX & ahash, T & acont) const
  {
    ahash = hash.Get(pos);
    acont = cont.Get(pos);
  }
  
  ///
  inline void SetData (int pos, const T & acont)
  {
    cont.Elem(pos) = acont;
  }
  
  ///
  void GetData (int pos, T & acont) const
  {
    acont = cont.Get(pos);
  }
  
  ///
  const T & GetData (int pos) { return cont.Get(pos); }
  ///
  inline void SetSize (int size)
  {
    BaseSetSize(size);
  cont.SetSize(size);
  }
  
  ///
  inline void DeleteData ()
  { SetSize (cont.Size()); }

  void SetName (const char * aname)
  {
    // cont.SetName(aname);
    // hash.SetName(aname);
  }
};





  inline size_t RoundUp2 (size_t i)
  {
    size_t res = 1;
    while (res < i) res *= 2; // hope it will never be too large 
    return res; 
  }

/// Closed Hashing HT

class BASE_INDEX_2_CLOSED_HASHTABLE
{
protected:
  ///
  // MoveableArray<INDEX_2> hash;
  NgArray<INDEX_2> hash;
  ///
  int invalid;
  size_t mask;
public:
  ///
  DLL_HEADER BASE_INDEX_2_CLOSED_HASHTABLE (size_t size);

  int Size() const { return hash.Size(); }
  bool UsedPos0 (int pos) const { return ! (hash[pos].I1() == invalid); }
  int UsedElements () const;

  ///
  int HashValue (const INDEX_2 & ind) const
    {
      // return (ind.I1() + 71 * ind.I2()) % hash.Size() + 1;
      return (ind.I1() + 71 * ind.I2()) & mask; 
    }


  int Position0 (const INDEX_2 & ind) const
  {
    int i = HashValue(ind);
    while (1)
      {
	if (hash[i] == ind) return i;
	if (hash[i].I1() == invalid) return -1;
        i = (i+1) & mask;        
        /*
	i++;
	if (i > hash.Size()) i = 1;
        */
      }
  }

  // returns 1, if new position is created
  bool PositionCreate0 (const INDEX_2 & ind, int & apos)
  {
    int i = HashValue (ind);
    if (hash[i] == ind) 
      {
	apos = i;
	return false;
      }
    if (hash[i].I1() == invalid)
      {
	hash[i] = ind; 
	apos = i;
	return true;
      }
    return PositionCreate2 (ind, apos);    
  }

protected:
  ///

  DLL_HEADER int Position2 (const INDEX_2 & ind) const;
  DLL_HEADER bool PositionCreate2 (const INDEX_2 & ind, int & apos);
  DLL_HEADER void BaseSetSize (int asize);
};


template <class T>
class INDEX_2_CLOSED_HASHTABLE : public BASE_INDEX_2_CLOSED_HASHTABLE
{
  NgArray<T> cont;
public:
  INDEX_2_CLOSED_HASHTABLE (size_t size)
    : BASE_INDEX_2_CLOSED_HASHTABLE(size), cont(RoundUp2(size))
  { ; }

  void Set (const INDEX_2 & ahash, const T & acont)
  {
    int pos;
    PositionCreate0 (ahash, pos);
    hash[pos] = ahash;
    cont[pos] = acont;
  }
    
  const T & Get (const INDEX_2 & ahash) const
  {
    int pos = Position0 (ahash);
    return cont[pos];
  }
    
  inline bool Used (const INDEX_2 & ahash) const
  {
    int pos = Position0 (ahash);
    return (pos != -1);
  }

  inline optional<T> GetIfUsed (const INDEX_2 & ahash) const
  {
    int pos = Position0 (ahash);
    if (pos != -1)
      return cont[pos];
    else
      return nullopt;
  }
    
  inline void SetData0 (int pos, const INDEX_2 & ahash, const T & acont)
  {
    hash[pos] = ahash;
    cont[pos] = acont;
  }
    
  ///
  inline void GetData0 (int pos, INDEX_2 & ahash, T & acont) const
  {
    ahash = hash[pos];
    acont = cont[pos];
  }
    
  inline void SetData0 (int pos, const T & acont)
  {
    cont[pos] = acont;
  }
  
  inline void GetData0 (int pos, T & acont) const
  {
    acont = cont[pos];
  }
  
  ///
  const T & GetData0 (int pos) { return cont[pos]; }
  ///
  inline void SetSize (size_t size)
  {
    BaseSetSize(size);
    cont.SetSize(RoundUp2(size));
  }

    
  ///
  inline void PrintMemInfo (ostream & ost) const;
  ///
  inline void DeleteData ()
  { SetSize (cont.Size()); }

  void SetName (const char * aname)
  {
    ; 
    // cont.SetName(aname);
    // hash.SetName(aname);
  }
};



template <typename T> 
inline ostream & operator<< (ostream & ost, const INDEX_2_CLOSED_HASHTABLE<T> & ht)
{
  for (int i = 0; i < ht.Size(); i++)
    if (ht.UsedPos(i))
      {
	INDEX_2 hash;
	T data;
	ht.GetData0 (i, hash, data);
	ost << "hash = " << hash << ", data = " << data << endl;
      }
  return ost;
}




class BASE_INDEX_3_CLOSED_HASHTABLE
{
protected:
  NgArray<INDEX_3> hash;
  int invalid;
  size_t mask;

protected: 
  BASE_INDEX_3_CLOSED_HASHTABLE (size_t size)
    : hash(RoundUp2(size))
  {
    // cout << "orig size = " << size
    // << ", roundup size = " << hash.Size();
    size = hash.Size();
    mask = size-1;
    // cout << "mask = " << mask << endl;
    invalid = -1;
    for (size_t i = 0; i < size; i++)
      hash[i].I1() = invalid;
  }

public:
  int Size() const 
  {
    return hash.Size(); 
  }

  bool UsedPos (int pos) const 
  { 
    return ! (hash[pos].I1() == invalid); 
  }

  int UsedElements () const
  {
    int n = hash.Size();
    int cnt = 0;
    for (int i = 0; i < n; i++)
      if (hash[i].I1() != invalid)
	cnt++;
    return cnt;
  }

  int HashValue (const INDEX_3 & ind) const
  {
    // return (ind.I1() + 15 * ind.I2() + 41 * ind.I3()) % hash.Size();
    return (ind.I1() + 15 * ind.I2() + 41 * ind.I3()) & mask;
  }
  
  int Position (const INDEX_3 & ind) const
  {
    int i = HashValue(ind);
    while (1)
      {
	if (hash[i] == ind) return i;
	if (hash[i].I1() == invalid) return -1;
        // i = (i+1) % hash.Size();
        i = (i+1) & mask;
      }
  }

  int Costs (const INDEX_3 & ind) const
  {
    int i = HashValue(ind);
    int c = 1;
    while (1)
      {
	if (hash[i] == ind) return c;
	if (hash[i].I1() == invalid) return c;
        // i = (i+1) % hash.Size();
        i = (i+1) & mask;
        c++;
      }
  }


  
  // returns true, if new position is created
  bool PositionCreate (const INDEX_3 & ind, int & apos)
  {
    int i = HashValue (ind);
    if (hash[i] == ind) 
      {
	apos = i;
	return false;
      }
    if (hash[i].I1() == invalid)
      {
	hash[i] = ind; 
	apos = i;
	return true;
      }
    return PositionCreate2 (ind, apos);    
  }

  void DeleteData()
  {
    size_t size = hash.Size();
    for (size_t i = 0; i < size; i++)
      hash[i].I1() = invalid;
  }

protected:
  bool PositionCreate2 (const INDEX_3 & ind, int & apos);
  void BaseSetSize (int asize);
};



template <class T>
class INDEX_3_CLOSED_HASHTABLE : public BASE_INDEX_3_CLOSED_HASHTABLE
{
  // MoveableArray<T,0> cont;
  NgArray<T,0> cont;

public:
  INDEX_3_CLOSED_HASHTABLE (int size)
    : BASE_INDEX_3_CLOSED_HASHTABLE(size), cont(RoundUp2(size))
  {
    ; //cont.SetName ("i3-hashtable, contents");
  }
  
  void Set (const INDEX_3 & ahash, const T & acont)
  {
    int pos;
    PositionCreate (ahash, pos);
    hash[pos] = ahash;
    cont[pos] = acont;
  }

  const T & Get (const INDEX_3 & ahash) const
  {
    return cont[Position (ahash)];
  }

  bool Used (const INDEX_3 & ahash) const
  {
    return (Position (ahash) != -1);
  }

  void SetData (int pos, const INDEX_3 & ahash, const T & acont)
  {
    hash[pos] = ahash;
    cont[pos] = acont;
  }

  void GetData (int pos, INDEX_3 & ahash, T & acont) const
  {
    ahash = hash[pos];
    acont = cont[pos];
  }

  void SetData (int pos, const T & acont)
  {
    cont[pos] = acont;
  }

  void GetData (int pos, T & acont) const
  {
    acont = cont[pos];
  }

  const T & GetData (int pos) const
  {
    return cont[pos];
  }

   void SetSize (int size)
  {
    BaseSetSize(size);
    cont.SetSize(hash.Size());
  }

  void PrintMemInfo (ostream & ost) const
  {
    cout << "Hashtable: " << Size() 
         << " entries of size " << sizeof(INDEX_3) << " + " << sizeof(T) 
         << " = " << Size() * (sizeof(INDEX_3) + sizeof(T)) << " bytes" << endl;
    
  }

  void DeleteData ()
  { 
    SetSize (cont.Size()); 
  }

  void SetName (const char * aname)
  {
    ; 
    // cont.SetName(aname);
    // hash.SetName(aname);
  }
};



template <typename T> 
inline ostream & operator<< (ostream & ost, const INDEX_3_CLOSED_HASHTABLE<T> & ht)
{
  for (int i = 0; i < ht.Size(); i++)
    if (ht.UsedPos(i))
      {
	INDEX_3 hash;
	T data;
	ht.GetData (i, hash, data);
	ost << "hash = " << hash << ", data = " << data << endl;
      }
  return ost;
}















template<class T>
inline INDEX_3_HASHTABLE<T> :: INDEX_3_HASHTABLE (int size)
  : BASE_INDEX_3_HASHTABLE (size), cont(size)
{
  ;
}

template<class T>	
inline int INDEX_3_HASHTABLE<T> :: PositionCreate (const INDEX_3 & ahash, int & bnr, int & colnr)
{
  bnr = HashValue (ahash);
  colnr = Position (bnr, ahash);
  if (!colnr)
    {
      hash.Add (bnr, ahash);
      cont.AddEmpty (bnr);
      colnr = cont.EntrySize (bnr);
      return 1;
    }
  return 0;
}


template<class T>
inline void INDEX_3_HASHTABLE<T> :: Set (const INDEX_3 & ahash, const T & acont)
{
  int bnr = HashValue (ahash);
  int pos = Position (bnr, ahash);
  if (pos)
    cont.Set (bnr, pos, acont);
  else
    {
      hash.Add1 (bnr, ahash);
      cont.Add1 (bnr, acont);
    }
}

template<class T>
inline const T & INDEX_3_HASHTABLE<T> :: Get (const INDEX_3 & ahash) const
{
  int bnr = HashValue (ahash);
  int pos = Position (bnr, ahash);
  return cont.Get (bnr, pos);
}

template<class T>
inline bool INDEX_3_HASHTABLE<T> :: Used (const INDEX_3 & ahash) const
{
  return (Position (HashValue (ahash), ahash)) ? 1 : 0;
}

template<class T>
inline int INDEX_3_HASHTABLE<T> :: GetNBags () const
{
  return cont.Size();
}

template<class T>
inline int INDEX_3_HASHTABLE<T> :: GetBagSize (int bnr) const
{
  return cont.EntrySize (bnr);
}

template<class T>
inline void INDEX_3_HASHTABLE<T> :: GetData (int bnr, int colnr, INDEX_3 & ahash, T & acont) const
{
  ahash = hash.Get(bnr, colnr);
  acont = cont.Get(bnr, colnr);
}    

template<class T>
inline void INDEX_3_HASHTABLE<T> :: SetData (int bnr, int colnr, const INDEX_3 & ahash, const T & acont)
{
  hash.Set(bnr, colnr, ahash);
  cont.Set(bnr, colnr, acont);
}    

template<class T>
inline void INDEX_3_HASHTABLE<T> :: SetSize (int size)
{
  hash.SetSize (size);
  cont.SetSize (size);
}

template<class T>
inline void INDEX_3_HASHTABLE<T> :: DeleteData ()
{
  int n = hash.Size();
  hash.SetSize (n);
  cont.SetSize (n);
}

template<class T>
inline void INDEX_3_HASHTABLE<T> :: PrepareSet (const INDEX_3 & ahash)
{
  int bnr = HashValue (ahash);
  hash.IncSizePrepare (bnr-1);
  cont.IncSizePrepare (bnr-1);
}


template<class T>
inline void INDEX_3_HASHTABLE<T> :: AllocateElements ()
{
  hash.AllocateElementsOneBlock();
  cont.AllocateElementsOneBlock();
}



template<class T>
inline void INDEX_3_HASHTABLE<T> :: PrintMemInfo (ostream & ost) const
  {
    ost << "Hash: " << endl;
    hash.PrintMemInfo (ost);
    ost << "Cont: " << endl;
    cont.PrintMemInfo (ost);
  }





template<class T>
inline INDEX_HASHTABLE<T> :: INDEX_HASHTABLE (int size)
  : BASE_INDEX_HASHTABLE (size), cont(size)
  {
    ;
  }
	
template<class T>
inline void INDEX_HASHTABLE<T> :: Set (const INDEX & ahash, const T & acont)
    {
    int bnr = HashValue (ahash);
    int pos = Position (bnr, ahash);
    if (pos)
      cont.Set (bnr, pos, acont);
    else
      {
      hash.Add (bnr, ahash);
      cont.Add (bnr, acont);
      }
    }

template<class T>
inline const T & INDEX_HASHTABLE<T> :: Get (const INDEX & ahash) const
    {
    int bnr = HashValue (ahash);
    int pos = Position (bnr, ahash);
    return cont.Get (bnr, pos);
    }

template<class T>
inline bool INDEX_HASHTABLE<T> :: Used (const INDEX & ahash) const
    {
    return (Position (HashValue (ahash), ahash)) ? 1 : 0;
    }

template<class T>
inline int INDEX_HASHTABLE<T> :: GetNBags () const
    {
    return hash.Size();
    }

template<class T>
inline int INDEX_HASHTABLE<T> :: GetBagSize (int bnr) const
    {
    return hash.EntrySize(bnr);
    }

template<class T>
inline void INDEX_HASHTABLE<T> :: GetData (int bnr, int colnr, INDEX & ahash, T & acont) const
    {
    ahash = hash.Get(bnr, colnr);   
    acont = cont.Get(bnr, colnr);
    }
    
template<class T>
inline void INDEX_HASHTABLE<T> :: PrintMemInfo (ostream & ost) const
  {
    ost << "Hash: " << endl;
    hash.PrintMemInfo (ost);
    ost << "Cont: " << endl;
    cont.PrintMemInfo (ost);
  }


    
    
    
    
    








/* *********** Closed Hashing ************************* */
  
template<class T>
inline void INDEX_2_CLOSED_HASHTABLE<T> :: 
PrintMemInfo (ostream & ost) const
{
  cout << "Hashtable: " << Size() 
       << " entries of size " << sizeof(INDEX_2) << " + " << sizeof(T) 
       << " = " << Size() * (sizeof(INDEX_2) + sizeof(T)) << " bytes." 
       << " Used els: " << UsedElements() 
       << endl;
}
















/*
template<class T>
inline INDEX_3_CLOSED_HASHTABLE<T> :: 
INDEX_3_CLOSED_HASHTABLE (int size)
  : BASE_INDEX_3_CLOSED_HASHTABLE(size), cont(size)
{
  cont.SetName ("i3-hashtable, contents");
}

template<class T>
inline void INDEX_3_CLOSED_HASHTABLE<T> :: 
Set (const INDEX_3 & ahash, const T & acont)
{
  int pos;
  PositionCreate (ahash, pos);
  hash.Elem(pos) = ahash;
  cont.Elem(pos) = acont;
}

template<class T>
inline const T & INDEX_3_CLOSED_HASHTABLE<T> :: 
Get (const INDEX_3 & ahash) const
{
  int pos = Position (ahash);
  return cont[pos];
}

template<class T>
inline bool INDEX_3_CLOSED_HASHTABLE<T> :: 
Used (const INDEX_3 & ahash) const
{
  int pos = Position (ahash);
  return (pos != 0);
}

template<class T>
inline void INDEX_3_CLOSED_HASHTABLE<T> :: 
SetData (int pos, const INDEX_3 & ahash, const T & acont)
{
  hash.Elem(pos) = ahash;
  cont.Elem(pos) = acont;
}
  
template<class T>
inline void INDEX_3_CLOSED_HASHTABLE<T> :: 
GetData (int pos, INDEX_3 & ahash, T & acont) const
{
  ahash = hash.Get(pos);
  acont = cont.Get(pos);
}

template<class T>
inline void INDEX_3_CLOSED_HASHTABLE<T> :: 
SetData (int pos, const T & acont)
{
  cont.Elem(pos) = acont;
}
  
template<class T>
inline void INDEX_3_CLOSED_HASHTABLE<T> :: 
GetData (int pos, T & acont) const
{
  acont = cont.Get(pos);
}

template<class T>
inline const T & INDEX_3_CLOSED_HASHTABLE<T> :: 
GetData (int pos) const
{
  return cont.Get(pos);
}


template<class T>
inline void INDEX_3_CLOSED_HASHTABLE<T> :: 
SetSize (int size)
{
  BaseSetSize(size);
  cont.SetSize(size);
}
  
template<class T>
inline void INDEX_3_CLOSED_HASHTABLE<T> :: 
PrintMemInfo (ostream & ost) const
{
  cout << "Hashtable: " << Size() 
       << " entries of size " << sizeof(INDEX_3) << " + " << sizeof(T) 
       << " = " << Size() * (sizeof(INDEX_3) + sizeof(T)) << " bytes" << endl;
}
*/


inline void SetInvalid (INDEX & i) { i = -1; }
inline bool IsInvalid (INDEX i) { return i == -1; }
inline size_t HashValue (INDEX i, size_t size) { return (113*size_t(i)) % size; }

inline void SetInvalid (INDEX_2 & i2) { i2[0] = -1; }
inline bool IsInvalid (INDEX_2 i2) { return i2[0] == -1; }
inline size_t HashValue (INDEX_2 i2, size_t size) { return (113*size_t(i2[0])+size_t(i2[1])) % size; }

inline void SetInvalid (INDEX_3 & i3) { i3[0] = -1; }
inline bool IsInvalid (INDEX_3 i3) { return i3[0] == -1; }
inline size_t HashValue (INDEX_3 i3, size_t size) { return (i3[0]+15*size_t(i3[1])+41*size_t(i3[2])) % size; }


  /**
     A closed hash-table.
     All information is stored in one fixed array.
     The array should be allocated with the double size of the expected number of entries.
  */
  template <class T_HASH, class T>
  class NgClosedHashTable
  {
  protected:
    ///
    size_t size;
    ///
    size_t used;
    ///
    NgArray<T_HASH> hash;
    ///
    NgArray<T> cont;
  public:
    ///
    NgClosedHashTable (size_t asize = 128)
      : size(asize), used(0), hash(asize), cont(asize)
    {
      for (auto & v : hash)
        SetInvalid(v);
    }

    NgClosedHashTable (NgClosedHashTable && ht2) = default;

    NgClosedHashTable (NgFlatArray<T_HASH> _hash, NgFlatArray<T> _cont)
      : size(_hash.Size()), used(0), hash(_hash.Size(), _hash.Addr(0)), cont(_cont.Size(), _cont.Addr(0))
    {
      for (auto & v : hash)
        SetInvalid(v);
    }


    NgClosedHashTable & operator= (NgClosedHashTable && ht2) = default;

    /// 
    size_t Size() const
    {
      return size;
    }

    /// is position used
    bool UsedPos (size_t pos) const
    {
      return ! (IsInvalid(hash[pos]));
    }

    /// number of used elements
    size_t UsedElements () const
    {
      return used;
    }

    size_t Position (const T_HASH ind) const
    {
      size_t i = HashValue(ind, size);
      while (1)
	{
	  if (hash[i] == ind) return i;
	  if (IsInvalid(hash[i])) return size_t(-1);
	  i++;
	  if (i >= size) i = 0;
	}
    }

    void DoubleSize()
    {
      NgClosedHashTable tmp(2*Size());
      for (auto both : *this)
        tmp[both.first] = both.second;
      *this = std::move(tmp);
    }
    
    // returns true if new position is created
    bool PositionCreate (const T_HASH ind, size_t & apos)
    {
      if (UsedElements()*2 > Size()) DoubleSize();
      
      size_t i = HashValue (ind, size);

      while (1)
	{
	  if (IsInvalid(hash[i]))
	    { 
	      hash[i] = ind; 
	      apos = i;
              used++;
	      return true;
	    }
	  if (hash[i] == ind) 
	    { 
	      apos = i; 
	      return false; 
	    }
	  i++;
	  if (i >= size) i = 0;
	}
    }


    ///
    void Set (const T_HASH & ahash, const T & acont)
    {
      size_t pos;
      PositionCreate (ahash, pos);
      hash[pos] = ahash;
      cont[pos] = acont;
    }

    ///
    const T & Get (const T_HASH & ahash) const
    {
      size_t pos = Position (ahash);
      if (pos == size_t(-1))
        throw Exception (string("illegal key: ") + ToString(ahash) );
      return cont[pos];
    }

    ///
    bool Used (const T_HASH & ahash) const
    {
      return (Position (ahash) != size_t(-1));
    }

    void SetData (size_t pos, const T_HASH & ahash, const T & acont)
    {
      hash[pos] = ahash;
      cont[pos] = acont;
    }

    void GetData (size_t pos, T_HASH & ahash, T & acont) const
    {
      ahash = hash[pos];
      acont = cont[pos];
    }
  
    void SetData (size_t pos, const T & acont)
    {
      cont[pos] = acont;
    }

    void GetData (size_t pos, T & acont) const
    {
      acont = cont[pos];
    }

    pair<T_HASH,T> GetBoth (size_t pos) const
    {
      return pair<T_HASH,T> (hash[pos], cont[pos]);
    }

    const T & operator[] (T_HASH key) const { return Get(key); }
    T & operator[] (T_HASH key)
    {
      size_t pos;
      PositionCreate(key, pos);
      return cont[pos];
    }
    
    void SetSize (size_t asize)
    {
      size = asize;
      hash.Alloc(size);
      cont.Alloc(size);

      // for (size_t i = 0; i < size; i++)
      // hash[i] = invalid;
      // hash = T_HASH(invalid);
      for (auto & v : hash)
        SetInvalid(v);
    }

    void Delete (T_HASH key)
    {
      size_t pos = Position(key);
      if (pos == size_t(-1)) return;
      SetInvalid (hash[pos]); used--;
      
      while (1)
        {
          size_t nextpos = pos+1;
          if (nextpos == size) nextpos = 0;
          if (IsInvalid(hash[nextpos])) break;

          auto key = hash[nextpos];
          auto val = cont[nextpos];
          SetInvalid (hash[nextpos]); used--;
          
          Set (key, val);
          pos = nextpos;
        }
    }

    void DeleteData()
    {
      for (auto & v : hash)
        SetInvalid(v);
      used = 0;
    }
    
    class Iterator
    {
      const NgClosedHashTable & tab;
      size_t nr;
    public:
      Iterator (const NgClosedHashTable & _tab, size_t _nr)
        : tab(_tab), nr(_nr)
      {
        while (nr < tab.Size() && !tab.UsedPos(nr)) nr++;
      }
      Iterator & operator++()
      {
        nr++;
        while (nr < tab.Size() && !tab.UsedPos(nr)) nr++;
        return *this;
      }
      bool operator!= (const Iterator & it2) { return nr != it2.nr; }
      auto operator* () const
      {
        T_HASH hash;
        T val;
        tab.GetData(nr, hash,val);
        return std::make_pair(hash,val);
      }
    };

    Iterator begin() const { return Iterator(*this, 0); }
    Iterator end() const { return Iterator(*this, Size()); } 
  };

  template <class T_HASH, class T>  
  ostream & operator<< (ostream & ost,
                        const NgClosedHashTable<T_HASH,T> & tab)
  {
    for (size_t i = 0; i < tab.Size(); i++)
      if (tab.UsedPos(i))
        {
          T_HASH key;
          T val;
          tab.GetData (i, key, val);
          ost << key << ": " << val << ", ";
        }
    return ost;
  }
    

  


}


#endif