\begin{ccRefFunction}{left_turn}

\ccFunction{bool left_turn(const Point_2<Kernel> &p,
                           const Point_2<Kernel> &q,
                           const Point_2<Kernel> &r);}
{returns \ccc{true} iff \ccc{p}, \ccc{q}, and \ccc{r} form a left turn.}

\ccSeeAlso
\ccRefIdfierPage{CGAL::collinear} \\
\ccRefIdfierPage{CGAL::orientation} \\
\ccRefIdfierPage{CGAL::right_turn} \\

\end{ccRefFunction}