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// Copyright (C) 2000-2007, Luca Padovani <padovani@sti.uniurb.it>.
// 
// This file is part of GtkMathView, a flexible, high-quality rendering
// engine for MathML documents.
// 
// GtkMathView is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// 
// GtkMathView 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.
// 
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#ifndef __SmartPtr_hh__
#define __SmartPtr_hh__

#include <cassert>
#include "gmv_defines.h"

template <class P>
class GMV_MathView_EXPORT SmartPtr
{
public:
  SmartPtr(P* p = 0) : ptr(p) { if (ptr) ptr->ref(); }
  SmartPtr(const SmartPtr& p) : ptr(p.ptr) { if (ptr) ptr->ref(); }
  ~SmartPtr() { if (ptr) ptr->unref(); }

  P* operator->() const { assert(ptr); return ptr; }
  SmartPtr& operator=(const SmartPtr& p)
  { 
    if (ptr == p.ptr) return *this;
    if (p.ptr) p.ptr->ref();
    if (ptr) ptr->unref();
    ptr = p.ptr;
    return *this;
  }

  operator P*() const { return ptr; }
  template <class Q, class R> friend SmartPtr<Q> smart_cast(const SmartPtr<R>&);
  template <class Q, class R> friend bool is_a(const SmartPtr<R>&);
  template <class Q> operator SmartPtr<Q>() const { return SmartPtr<Q>(ptr); }

private:
  P* ptr;
};

template <class Q, class P>
SmartPtr<Q>
smart_cast(const SmartPtr<P>& p)
{ return SmartPtr<Q>(dynamic_cast<Q*>(p.ptr)); }  

template <class Q, class R>
bool
is_a(const SmartPtr<R>& p)
{ return dynamic_cast<Q*>(p.ptr) != 0; }

#endif // __SmartPtr_hh__