CGAL 6.1 - dD Spatial Searching

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Spatial_searching/Point.h
struct Point {
double vec[3];
Point() { vec[0]= vec[1] = vec[2] = 0; }
Point (double x, double y, double z) { vec[0]=x; vec[1]=y; vec[2]=z; }
double x() const { return vec[ 0 ]; }
double y() const { return vec[ 1 ]; }
double z() const { return vec[ 2 ]; }
double& x() { return vec[ 0 ]; }
double& y() { return vec[ 1 ]; }
double& z() { return vec[ 2 ]; }
bool operator==(const Point& p) const
{
return (x() == p.x()) && (y() == p.y()) && (z() == p.z()) ;
}
bool operator!=(const Point& p) const { return ! (*this == p); }
}; //end of class
struct Construct_coord_iterator {
typedef const double* result_type;
const double* operator()(const Point& p) const
{ return static_cast<const double*>(p.vec); }
const double* operator()(const Point& p, int) const
{ return static_cast<const double*>(p.vec+3); }
};