;;;  -*- Hen -*-
;;;; levenshtein-cost-interface.scm
;;;; Kon Lovett, Apr 2012

(define-interface COST-OPER (
  cost-multiply                 ;cost cost -> cost
  cost-add                      ;cost cost -> cost
  cost-minimum                  ;cost cost -> cost
  cost-less-than                ;cost cost -> cost
  cost-positive-infinity))      ;cost

(: cost number)