NewNet/nnbaseptr.h

/*  NewNet - A networking framework in C++
    Copyright (C) 2006 Ingmar K. Steen (iksteen@gmail.com)

    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 NEWNET_BASEPTR_H
#define NEWNET_BASEPTR_H

#ifdef NN_PTR_DEBUG
 #include <assert.h>
 #ifdef NN_PTR_DEBUG_ASSERT
  #define NN_PTR_CHECK { assert(m_Ptr != 0); }
 #else
  #include <iostream>
  #define NN_PTR_CHECK { if(! m_Ptr) std::cerr << "Warning: Dereferencing NULL pointer" << std::endl; }
 #endif
#else
 #define NN_PTR_CHECK
#endif

namespace NewNet
{
  class Object;


  template<class T> class BasePtr
  {
  public:

    BasePtr() : m_Ptr(0)
    {
    }


    BasePtr(T * t) : m_Ptr(t)
    {
    }


    T * ptr() const
    {
      return m_Ptr;
    }


    operator T*() const
    {
      return m_Ptr;
    }


    T & operator*()
    {
      NN_PTR_CHECK
      return *m_Ptr;
    }


    const T & operator*() const
    {
      NN_PTR_CHECK
      return *m_Ptr;
    }


    T * operator->()
    {
      NN_PTR_CHECK
      return m_Ptr;
    }


    const T * operator->() const
    {
      NN_PTR_CHECK
      return m_Ptr;
    }


    bool isValid() const
    {
      return m_Ptr != 0;
    }


    bool operator!() const
    {
      return m_Ptr == 0;
    }

  protected:

    T * m_Ptr;
  };
}

#undef NN_PTR_CHECK
  
#endif // NEWNET_REFPTR_H

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