+require 'ostruct'
+
+module Graph
+ class Graph < OpenStruct
+ def initialize
+ super
+ self.edges = Array.new
+ self.vertices = Array.new
+ self
+ end
+
+ def <<(other)
+ if other.class == Vertex
+ self.vertices << other
+ elsif
+ self.edges << other
+ end
+ self
+ end
+ end
+end