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\begin{ccRefFunction}{leftturn}
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\ccInclude{CGAL/predicates_on_points_2.h}
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\ccFunction{bool leftturn(const Point_2<R> &p,
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const Point_2<R> &q,
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const Point_2<R> &r);}
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{returns \ccc{true} iff \ccc{p}, \ccc{q}, and \ccc{r} form a left turn.}
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\end{ccRefFunction}
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