OwningOrAliasingPtr.ih

/**
 *  This program 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.
 *
 *  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, see <http://www.gnu.org/licenses/>.
 *
 **/
 
/**
 * @file OwningOrAliasingPtr.ih
 * @author Tristan Roussillon (\c tristan.roussillon@liris.cnrs.fr )
 * Laboratoire d'InfoRmatique en Image et Systèmes d'information - LIRIS (CNRS, UMR 5205), CNRS, France
 *
 * @date 2012/11/14
 *
 * Implementation of inline methods defined in OwningOrAliasingPtr.h
 *
 * This file is part of the DGtal library.
 */
 
 
//////////////////////////////////////////////////////////////////////////////
#include <cstdlib>
//////////////////////////////////////////////////////////////////////////////
 
///////////////////////////////////////////////////////////////////////////////
// IMPLEMENTATION of inline methods.
///////////////////////////////////////////////////////////////////////////////
 
///////////////////////////////////////////////////////////////////////////////
// ----------------------- Standard services ------------------------------
 
 
template <typename T>
inline
DGtal::OwningOrAliasingPtr<T>::OwningOrAliasingPtr(const T& aValue)
  :myPtr( new T(aValue) ), myFlagIsOwning( true ) 
{
}
 
template <typename T>
inline
DGtal::OwningOrAliasingPtr<T>::OwningOrAliasingPtr(T* aPtr, bool aFlagIsOwning)
  :myPtr( aPtr ), myFlagIsOwning( aFlagIsOwning ) 
{
}
 
template <typename T>
inline
DGtal::OwningOrAliasingPtr<T>::OwningOrAliasingPtr(const DGtal::OwningOrAliasingPtr<T>& other)
  : myFlagIsOwning( other.myFlagIsOwning ) 
{
  ASSERT( myFlagIsOwning == other.myFlagIsOwning ); 
  if (myFlagIsOwning)
    myPtr = new Value( *other.myPtr ); //copy of the data
  else
    myPtr = other.myPtr; //copy of the alias
}
 
template <typename T>
inline
DGtal::OwningOrAliasingPtr<T>&
DGtal::OwningOrAliasingPtr<T>::operator=(const DGtal::OwningOrAliasingPtr<T>& other)
{
  if ( this != &other )
    {
      //free old data (if needed)
      if (myFlagIsOwning)
        delete(myPtr); 
      //acquire new data
      myFlagIsOwning = other.myFlagIsOwning;
      if (myFlagIsOwning)
        myPtr = new Value( *other.myPtr ); //copy of the data
      else
        myPtr = other.myPtr; //copy of the alias
    }
  return *this;
}
 
template <typename T>
inline
DGtal::OwningOrAliasingPtr<T>::~OwningOrAliasingPtr()
{
  //free if @a myPtr owns the data
  if (myFlagIsOwning)
    delete(myPtr); 
}
 
///////////////////////////////////////////////////////////////////////////////
// Interface - public :
 
template <typename T>
inline
typename DGtal::OwningOrAliasingPtr<T>::Pointer
DGtal::OwningOrAliasingPtr<T>::get() const
{
  return myPtr;
}
 
template <typename T>
inline
typename DGtal::OwningOrAliasingPtr<T>::Pointer
DGtal::OwningOrAliasingPtr<T>::operator->() const
{
  return myPtr;
}
 
template <typename T>
inline
typename DGtal::OwningOrAliasingPtr<T>::Reference
DGtal::OwningOrAliasingPtr<T>::operator*() const
{
  ASSERT( myPtr != NULL ); 
  return *myPtr;
}
 
template <typename T>
inline
bool
DGtal::OwningOrAliasingPtr<T>::isOwning() const
{
  return myFlagIsOwning;
}
 
template <typename T>
inline
bool
DGtal::OwningOrAliasingPtr<T>::isValid() const
{
  return true;
}
 
template <typename T>
inline
void
DGtal::OwningOrAliasingPtr<T>::selfDisplay ( std::ostream & out ) const
{
  out << "[OwningOrAliasingPtr]";
  if (myPtr != NULL)
    out << "  " << myPtr << " " << (*myPtr);
  else 
    out << "  " << myPtr << " " << "NULL";
}
 
 
///////////////////////////////////////////////////////////////////////////////
// Implementation of inline functions                                        //
 
template <typename T>
inline
std::ostream&
DGtal::operator<< ( std::ostream & out, 
                  const OwningOrAliasingPtr<T> & object )
{
  object.selfDisplay( out );
  return out;
}
 
//                                                                           //
///////////////////////////////////////////////////////////////////////////////