DistanceFunc Delegate

public delegate double DistanceFunc(
	double x1,
	double y1,
	double x2,
	double y2
)

Public Delegate Function DistanceFunc ( 
	x1 As Double,
	y1 As Double,
	x2 As Double,
	y2 As Double
) As Double

public delegate double DistanceFunc(
	double x1, 
	double y1, 
	double x2, 
	double y2
)

type DistanceFunc = 
    delegate of 
        x1 : float * 
        y1 : float * 
        x2 : float * 
        y2 : float -> float

function(x1, y1, x2, y2);