# File lib/rgl/adjacency.rb, line 41
41:     def initialize (edgelist_class = Set, *other_graphs)
42:       @edgelist_class = edgelist_class
43:       @vertice_dict   = Hash.new
44:       other_graphs.each do |g|
45:         g.each_vertex {|v| add_vertex v}
46:         g.each_edge {|v,w| add_edge v,w}
47:       end
48:     end