Thanks for the advice :)
Best,
Alfredo
On Apr 8, 5:54 pm, Laurent PETIT <laurent.pe...@gmail.com> wrote:
> 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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