I think you'll want an answer from Stefan, Jeff, Keno, Jameson or Viral to get a better review, but my sense is that multiple dispatch is primarily costly at compile time and pays close to zero cost at run-time. Within a function body, if the types of variables don't change, then the choice of which methods for "+" to call are already perfectly determined by the time the function body is being exeuted.
-- John On Dec 5, 2014, at 8:41 AM, Ronald L. Rivest <rivest....@gmail.com> wrote: > Multiple dispatch is a unique and interesting feature of Julia... > > How is it implemented? > > What is the overhead incurred by multiple dispatch? (Esp. if there are a > large > number of methods, as for "+" ?). > > Cheers, > Ron
