Requirements for a Distance Class

A distance class is a class designed to store three points p0, p1 and p2 and to decide which of p1 and p2 is closer to p0. The class is templated by a geometric traits class Gt which is required to provide the Point type and provide a compare() member function defining what closer means.

Types

Creation

The following constructor creates a distance object. Missing points are not initialized.

Distance<Gt> dt ( Point p0=Point(), Point p1=Point(), Point p2=Point(), Gt* gt = NULL);

Operations

void	dt.set_point ( int i, Point pi)
		Replaces point $$i. Precondition: $$0 i 2.
Point	dt.get_point ( int i)
		Returns point $$i. Precondition: $$0 i 2.
Comparison_result	dt.compare ()	Compares the distance between p0 and p1 with the distance between p0 and and p2. Precondition: p1 and p2 are initialized.