owned_pointer.h

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/*
 * Copyright (c) 2012-2015:  G-CSC, Goethe University Frankfurt
 * Author: Sebastian Reiter
 * 
 * This file is part of UG4.
 * 
 * UG4 is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 3 (as published by the
 * Free Software Foundation) with the following additional attribution
 * requirements (according to LGPL/GPL v3 §7):
 * 
 * (1) The following notice must be displayed in the Appropriate Legal Notices
 * of covered and combined works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (2) The following notice must be displayed at a prominent place in the
 * terminal output of covered works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (3) The following bibliography is recommended for citation and must be
 * preserved in all covered files:
 * "Reiter, S., Vogel, A., Heppner, I., Rupp, M., and Wittum, G. A massively
 *   parallel geometric multigrid solver on hierarchically distributed grids.
 *   Computing and visualization in science 16, 4 (2013), 151-164"
 * "Vogel, A., Reiter, S., Rupp, M., Nägel, A., and Wittum, G. UG4 -- a novel
 *   flexible software system for simulating pde based models on high performance
 *   computers. Computing and visualization in science 16, 4 (2013), 165-179"
 * 
 * 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 Lesser General Public License for more details.
 */
 
#ifndef __H__UG__owned_pointer__
#define __H__UG__owned_pointer__
 
namespace ug
{
 
 
 
template <class T>
class OwnedPtr
{
  public:
    typedef T* TPtr;
    typedef T& TRef;
 
    OwnedPtr(TPtr p = 0) : m_p(p) {}
 
 
    OwnedPtr(const OwnedPtr& op)
    {
      m_p = op.get();
      op.invalidate();
    }
 
 
    OwnedPtr& operator=(const OwnedPtr& op)
    {
      reset(op.get());
      op.invalidate();
      return *this;
    }
 
    void reset(TPtr p = 0)        {if(m_p) delete m_p; m_p = p;}
 
    TPtr operator ->() const      {return m_p;}
    TRef operator *() const       {return *m_p;}
 
    TPtr& get() const         {return m_p;}
 
    operator bool() const       {return m_p != 0;}
 
  private:
    void invalidate() const       {m_p = 0;}
 
  private:
    mutable TPtr m_p;
};
 
// end group ugbase_common_util
 
}// end of namespace
 
#endif