## CGAL::ch_ns_point

### Definition

The function ch_ns_point finds the points of a given set of input points with minimal and maximal x coordinates.

#include <CGAL/ch_selected_extreme_points_2.h>

template <class ForwardIterator>

void

ch_ns_point ( | ForwardIterator first, ForwardIterator beyond, ForwardIterator& n, ForwardIterator& s, Traits ch_traits = Default_traits)

|  | traverses the range [first,beyond). After execution, the value of n is an iterator in the range such that *n yx *it for all iterators it in the range. Similarly, for s the inequality *s yx *it holds for all iterators in the range.

The default traits class Default_traits is the kernel in which the type ForwardIterator::value_type is defined.

### Requirements

Traits defines the type Traits::Less_yx_2 as specified in the concept ConvexHullTraits_2 and the corresponding member function that returns an instance of this type.

### See Also

CGAL::ch_e_point
CGAL::ch_nswe_point
CGAL::ch_n_point
CGAL::ch_s_point
CGAL::ch_w_point
CGAL::ch_we_point