ScopedPtr.h++

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/* ---------------------------------------------------------------------------
   commonc++ - A C++ Common Class Library
   Copyright (C) 2005-2014  Mark A Lindner

   This file is part of commonc++.

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

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   ---------------------------------------------------------------------------
*/

#ifndef __ccxx_ScopedPtr_hxx
#define __ccxx_ScopedPtr_hxx

#include <commonc++/Common.h++>
#include <commonc++/NullPointerException.h++>

namespace ccxx {

template<class T> class ScopedPtr
{
 public:

  ScopedPtr()
    : _object(NULL)
  { }

  explicit ScopedPtr(T* object)
    : _object(object)
  { }

  ~ScopedPtr()
  { delete _object; }

  T& operator*() const
  {
    if(! _object)
      throw NullPointerException();

    return(*_object);
  }

  T* operator->() const
  {
    if(! _object)
      throw NullPointerException();

    return(_object);
  }

  void reset(T* object = NULL)
  {
    if(_object != object)
    {
      delete _object;
      _object = object;
    }
  }

  T* get() const
  { return(_object); }

  T* release()
  {
    T* tmp = _object;
    _object = NULL;
    return(tmp);
  }

  bool operator!() const
  { return(isNull()); }

  operator const void*() const
  { return(_object ? this : NULL); }

  bool isNull() const
  { return(_object == NULL); }

  void swap(ScopedPtr& other)
  {
    T* tmp = other._object;
    other._object = _object;
    _object = tmp;
  }

 private:

  T* _object;

  CCXX_COPY_DECLS(ScopedPtr);
};

template<class T> inline void swap(ScopedPtr<T>& a, ScopedPtr<T>& b)
{ a.swap(b); }

} // namespace ccxx

#endif // __ccxx_ScopedPtr_hxx