In addition to the requirements described in the concept DelaunayTriangulationTraits_3, the geometric traits class of a Delaunay triangulation plugged in a basic alpha shapes provides the following.
 
A number type compatible with the type used for
the points coordinate.
 
 
An object constructor able to compute the squared radius of the
smallest circumsphere of 4 points p0, p1, p2, p3,
the squared radius of the
smallest circumsphere of 3 points p0, p1, p2,
and the squared radius of smallest circumsphere
of the points p0, p1.

 
Default constructor.

 
