\begin{ccRefConstant}{ORIGIN}

\ccGlobalVariable{const Origin ORIGIN;}

\ccDefinition
A symbolic constant which denotes the point at the origin.
This constant is used in the conversion between points and vectors.

\ccExample

\begin{cprog}
  Point_2< Cartesian<Filtered_exact<leda_real,leda_real> > >  p(1.0, 1.0), q;
  Vector2< Cartesian<Filtered_exact<leda_real,leda_real> > >  v;
  v = p - ORIGIN;
  q = ORIGIN + v;  
  assert( p == q );
\end{cprog} 

\end{ccRefConstant}