CGAL 5.1.3 - dD Spatial Searching
#include <CGAL/Simple_cartesian.h>
#include <CGAL/point_generators_2.h>
#include <CGAL/Orthogonal_k_neighbor_search.h>
#include <CGAL/Search_traits_2.h>
#include <list>
#include <cmath>
typedef K::Point_2 Point_d;
typedef CGAL::Search_traits_2<K> TreeTraits;
typedef Neighbor_search::Tree Tree;
int main() {
const unsigned int N = 1;
std::list<Point_d> points;
Tree tree(points.begin(), points.end());
Point_d query(0,0);
// Initialize the search structure, and search all N points
Neighbor_search search(tree, query, N);
// report the N nearest neighbors and their distance
// This should sort all N points by increasing distance from origin
for(Neighbor_search::iterator it = search.begin(); it != search.end(); ++it){
std::cout << it->first << " "<< std::sqrt(it->second) << std::endl;
return 0;