OwningOrAliasingPtr.ih

#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;
}

//                                                                           //