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The point type on which the convex hull functions operate.
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Binary predicate object type comparing Point_2s
lexicographically. Must provide
bool operator()(Point_2 p, Point_2 q) where true
is returned iff .
We have , iff or and ,
where and denote and coordinate of point ,
respectively.
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Predicate object type that must provide
bool operator()(Point_2 p,Point_2 q,Point_2 r), which
returns true iff r lies to the left of the
oriented line through p and q.
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Only a copy constructor is required.
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