CGAL 5.4 - 2D and 3D Linear Geometry Kernel
Kernel::NonZeroCoordinateIndex_3 Concept Reference

## Definition

Refines:
AdaptableFunctor (with one arguments)

## Operations

A model of this concept must provide:

int operator() (const Kernel::Vector_3 &v)
returns any of 0, 1, or 2 if the corresponding coordinate of the vector v is not equal to zero, and -1 if v is the null vector.