Adding to that... have a look at the implemented methods in core_print.clj.
The print-method will get called on print and println with your instance as
the first argument. In this example prints a pair type; since elements can
be anything it just calls print on each.
(deftype Pair [fst snd])
(defmethod print-method Pair [r, ^java.io.Writer w]
(.write w "Pair(")
(print (.fst r))
(.write w ",")
(print (.snd r))
(.write w ")"))
On Thursday, August 1, 2013 3:04:47 PM UTC-7, Laurent PETIT wrote:
>
> I think you have to provide methods for multimethods print-dup and
> print-method:
>
>
> https://github.com/clojure/clojure/blob/c6756a8bab137128c8119add29a25b0a88509900/src/clj/clojure/core.clj#L3311
>
>
> 2013/8/1 Dragan Djuric <[email protected] <javascript:>>:
> > I have some custom types defined using deftype and I am trying to enable
> a
> > human-friendly string representation of these types in repl. Something
> > similar to #<Atom@123 "value">. How to do that in Clojure without
> redefining
> > toString? It seems that Clojure use a different way to achieve this for
> > atoms and refs, I just can't find what.
> >
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