Module Sig.G.E

module E: Sig.EDGE  with type vertex = vertex
Edges have type E.t and are labeled with type E.label. src (resp. dst) returns the origin (resp. the destination) of a given edge.

Edges are Sig.ORDERED_TYPE.
type t 
val compare : t -> t -> int

Edges are directed.
type vertex 
val src : t -> vertex
Edge origin.
val dst : t -> vertex
Edge destination.

Edges are labeled.
type label 
val create : vertex -> label -> vertex -> t
create v1 l v2 creates an edge from v1 to v2 with label l
val label : t -> label
Get the label of an edge.