\begin{ccRefFunction}{x_equal} \ccInclude{CGAL/predicates_on_points_2.h} \ccFunction{bool x_equal(const Point_2 &p, const Point_2 &q);} {returns \ccStyle{true}, iff \ccStyle{p} and \ccStyle{q} have the same \ccStyle{x}-coordinate.} \ccInclude{CGAL/predicates_on_points_3.h} \ccFunction{bool x_equal(const Point_3 &p, const Point_3 &q);} {returns \ccStyle{true}, iff \ccStyle{p} and \ccStyle{q} have the same \ccStyle{x}-coordinate.} \end{ccRefFunction}