Cost function Doesn't Have Access To Edge Label

[maxhawkins]

The edge label given to the cost function of an algorithm like dijkstras_algorithm is always nil.

For example
cost_function = lambda{|e| e.label || 0 }
Will always return a cost of zero because the label will always be nil.

It would be nice if the cost function was passed the actual edge instead of a copy with the same start and end point so that the edge label is accessible from inside the cost function.