Single Dispatch is an actively used design pattern. When the type of a single object is enough to determine what method to call.
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Example from common-lisp:
; https://eli.thegreenplace.net/2016/a-polyglots-guide-to-multiple-dispatch-part-3/ (defclass Person () ()) (defmethod frobnicate ((p Person) record spreadsheet) (format t "~a ~a ~a~&" (type-of p) (type-of record) (type-of spreadsheet))) (defclass Asteroid () ()) (defmethod frobnicate ((a Asteroid) velocity size) ; do stuff ) ; At runtime these 2 would be routed to respective methods: (frobnicate a-person his-record big-spreadsheet) (frobnicate an-asteroid very-fast pretty-small)
Last updated January 18th, 2020