-require 'ostruct'
-
-module Graph
- class Edge < OpenStruct
- def initialize
- super
- self.connections = []
- self
- end
-
- def <<(other)
- c = Connection.new
- c.end = other
- self.connections << c
- self
- end
-
- def vertices
- self.connections.map {|c| c.end}
- end
-
- def connection_at(vertex)
- self.connections.select {|c| c.end.equal? vertex}.first
- end
- end
-
- class Connection < OpenStruct
- def initialize
- super
- self
- end
- end
-end