/*

Copyright (C) 1997,1998,1999,2000,2001  Franz Josef Och (RWTH Aachen - Lehrstuhl fuer Informatik VI)

This file is part of GIZA++ ( extension of GIZA ).

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.

*/
#ifndef HEADER_Pointer_DEFINED
#define HEADER_Pointer_DEFINED

#include <cassert>
#include <iostream>

template<class T>
class SmartPointer
{
protected:
  T*p;
public:
  SmartPointer(T*_p=0)
    : p(_p) {}
  inline T&operator*() const {
    return *p;
  }
  inline T*operator->() const {
    return p;
  }
  inline operator bool() const {
    return p!=0;
  }
  inline T*ptr() const {
    return p;
  }
};
template<class T> inline ostream &operator<<(ostream&out,const SmartPointer<T>&s)
{
  if( s.ptr() )return out << *s;
  else return out <<"nullpointer";
}


template<class T>
class SmartPointerConst
{
protected:
  const T*p;
public:
  SmartPointerConst(const T*_p=0)
    : p(_p) {}
  inline const T&operator*() const {
    return *p;
  }
  inline const T*operator->() const {
    return p;
  }
  inline operator bool() const {
    return p!=0;
  }
  inline const T*ptr() const {
    return p;
  }
};
template<class T> inline ostream &operator<<(ostream&out,const SmartPointerConst<T>&s)
{
  if( s.ptr() )return out << *s;
  else return out <<"nullpointer";
}

template <class T>
class UP : public SmartPointer<T>
{
public:
  UP(T*_p=0)
    : SmartPointer<T>(_p) {}
};
template<class T> inline bool operator==(const UP<T>&s1,const UP<T>&s2)
{
  return s1.ptr()==s2.ptr();
}
template<class T>  inline bool operator<(const UP<T>&s1,const UP<T>&s2)
{
  return s1.ptr() < s2.ptr();
}
template<class T> inline int Hash(const UP<T> &wp)
{
  if(wp.ptr())return Hash(*wp);
  else return 0;
}


template <class T>
class UPConst : public SmartPointerConst<T>
{
public:
  UPConst(const T*_p=0)
    : SmartPointerConst<T>(_p) {}
};
template<class T> inline bool operator==(const UPConst<T>&s1,const UPConst<T>&s2)
{
  return s1.ptr()==s2.ptr();
}
template<class T> inline bool operator<(const UPConst<T>&s1,const UPConst<T>&s2)
{
  return s1.ptr()<s2.ptr();
}
template<class T> inline int Hash(const UPConst<T> &wp)
{
  if(wp.ptr())return Hash(*wp);
  else return 0;
}


template <class T>
class MP : public SmartPointer<T>
{
public:
  MP(T*_p=0)
    : SmartPointer<T>(_p) {}
};
template <class T> inline bool operator==(const MP<T>&s1,const MP<T>&s2)
{
  assert(s1);
  assert(s2);
  return *s1==*s2;
}
template <class T> inline bool operator<(const MP<T>&s1,const MP<T>&s2)
{
  assert(s1);
  assert(s2);
  return *s1 < *s2;
}
template <class T> inline int Hash(const MP<T> &wp)
{
  if(wp.ptr())return Hash(*wp);
  else return 0;
}


template <class T>
class MPConst : public SmartPointerConst<T>
{
public:
  MPConst(const T*_p=0)
    : SmartPointerConst<T>(_p) {}
};
template <class T> inline bool operator==(const MPConst<T>&s1,const MPConst<T>&s2)
{
  assert(s1);
  assert(s2);
  return *s1== *s2;
}
template <class T> inline bool operator<(const MPConst<T>&s1,const MPConst<T>&s2)
{
  assert(s1);
  assert(s2);
  return *s1 < *s2;
}
template <class T> inline int Hash(const MPConst<T> &wp)
{
  if(wp.ptr())return Hash(*wp);
  else return 0;
}


template <class T>
class DELP : public SmartPointer<T>
{
private:
  DELP(const DELP<T>&x);
public:
  const DELP<T>&operator=(DELP<T>&x) {
    delete this->p;
    this->p=x.p;
    x.p=0;
    return *this;
  }

  ~DELP() {
    delete this->p;
    this->p=0;
  }
  DELP(T*_p=0)
    : SmartPointer<T>(_p) {}
  void set(T*_p) {
    delete this->p;
    this->p=_p;
  }
  friend bool operator==(const DELP<T>&s1,const DELP<T>&s2) {
    return *(s1.p)== *(s2.p);
  }
  friend bool operator<(const DELP<T>&s1,const DELP<T>&s2) {
    return *(s1.p) < *(s2.p);
  }
  friend inline int Hash(const DELP<T> &wp) {
    if(wp.p)
      return Hash(*wp.p);
    else
      return 0;
  }
};
#endif