How about creating your own print-method multimethod in a lib of your
own, and in your libs, excluding clojure.core/print-method and
importing your-lib/print-method instead.

Then, in your-lib, make the default print-method invocation just call
clojure.core/print-method, create your own private hierarchy, and
provide defmethods for those types you want to provide with your own
implementation of defmethod ...

Cant' think of something better, for now ...

HTH,

-- 
Laurent

2010/1/5 Gabi <bugspy...@gmail.com>:
> Hi
> I am trying to extend Clojures' print-method using defmethod for a
> library I develop.:
> How can I do this without affecting users of my lib (i want only my
> lib to be affected )?
>
> (derive clojure.lang.Fn ::fn)
> (prefer-method print-method ::fn  java.lang.Object)
>
> (defmethod print-method ::fn
>    [o w]
>   (.write w "Some Fn")
>
> This is quite nice, but I would like to use a private hierarchy for
> the above, but cant. (print-method is defined on global hierarchy)
> What should I do ?
>
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