I presume that your tests are done in the same namespace as where the
protocol is defined.
For real user code, where the "using" namespace will not be equal to the "+
protocol defining" namespace, your users will have to somehow import the +
into their namespace.
As long as you don't "magically" redefine clojure.core/+ 's symbol, things
should be ok for your potential users, I guess.
Cheers,
--
Laurent
2011/4/8 Alfredo <alfredo.dinap...@gmail.com>
> Thanks for your help :)
> Bye
> Alfredo
>
> On Apr 8, 3:10 pm, Meikel Brandmeyer <m...@kotka.de> wrote:
> > Hi,
> >
> > On 8 Apr., 15:02, Alfredo <alfredo.dinap...@gmail.com> wrote:
> >
> > > I know that it's a user's choice, but I'm wondering if it's possibile
> > > to offer a "+" function that it's extended to other datatypes -with or
> > > without protocols - and still able to be applied to Numbers :)
> >
> > Yes. It is. Just provide it in your namespace. You showed already how.
> >
> > (ns your.library
> > (:refer-clojure :rename {+ core-+})
> > (:import
> > clojure.lang.IPersistentVector
> > clojure.lang.ISeq))
> >
> > (defprotocol Addable
> > (+ [t1 t2]))
> >
> > (extend-protocol Addable
> > String
> > (+ [s1 s2] (str s1 s2))
> > IPersistentVector
> > (+ [v1 v2] (into v1 v2))
> > ISeq
> > (+ [s1 s2] (concat s1 s2))
> > Number
> > (+ [n1 n2] (core-+ n1 n2)))
> >
> > This gives:
> > your.library=> (+ 1 2)
> > 3
> > your.library=> (+ "a" "b")
> > "ab"
> > your.library=> (+ [1 2] [3 4])
> > [1 2 3 4]
> > your.library=> (+ (list 1 2) (list 3 4))
> > (1 2 3 4)
> >
> > I'm not sure it's advisable, though. I think adding numbers has
> > nothing to with catenating strings. You should probably choose a name
> > like append, concat or into.
> >
> > Sincerely
> > Meikel
>
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