Am Dienstag, 10. Januar 2017 01:19:16 UTC+1 schrieb Didier:
>
> How would you declare a namespace within a namespace? Or two namespaces in
> the same file?
>
>
You can do so quite easily.
(ns foo.bar)
(defmulti a :dispatch)
(defn b
[x]
(str "Called a. This was the result: " (a x)))
(ns foo.bar.hidden)
(alias 'parent 'foo.bar)
(defmethod parent/a :yoyo
[x]
(str "yoyo: " (:value x)))
(defmethod parent/a :dyne
[x]
(str "dyne: " (:value x)))
; Go back to original namespace.
(in-ns 'foo.bar)
As you can try in the repl, this works.
user=> (require 'foo.bar)
nil
user=> (foo.bar/b {:dispatch :yoyo :value 5})
"Called a. This was the result: yoyo: 5"
user=> (foo.bar/b {:dispatch :dyne :value 5})
"Called a. This was the result: dyne: 5"
That said: I wouldn't recommend this. I'm not sure, I see a situation that
would justify the weirdness and hidden complexities of this approach. Too
much rope... If you really need this style of thing, put the hidden
namespace in its own file and use load.
Kind regards
Meikel
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