On Friday, March 2, 2012 7:03:10 AM UTC-6, tim.visher wrote:
>
> I will not in any way claim to know how or why this works. I'm just
> starting to use multimethods myself, but I'll give you my set up that
> appears to be working at the moment.
>
> I have a namespace:
>
> (ns store.store)
>
> (defmulti serialize method)
>
> (defmulti slurp method)
>
> in store.clj
>
> I have 1 implementation:
>
> (ns store.file-system
> [:use [store.store]]
> …)
>
> (def base "")
>
> (defmethod serialize :file-system [_ file-name contents]
> (fs-utils/write-to contents (str base "/" file-name)))
>
> (defmethod slurp :file-system [_ file-name]
> (clojure.core/slurp (str base "/" file-name)))
>
> I then use this from another namespace, requiring store.store and
> store.store.file-system:
>
> (ns library
> [:require [wallpaper-manager-core.store.file-system :as
> store-file-system]]
> [:require [wallpaper-manager-core.store.store :as store]])
>
> (binding [store-file-system/base (fs/home)]
> (def library (ref (read-library) :validator library-validator)))
>
> (defn serialize-library [library]
> (store/serialize :file-system "library.clj" library))
>
> And this all seems to work fine for me. Maybe someone else can explain
> why it does for me and doesn't for you. Maybe it has something to do
> with `use` vs. `require`?
>
This does indeed work for me. What I was trying to do was avoid was having
to do this part:
...
[:require [wallpaper-manager-core.store.store :as store]])
As each time I add a defmethod implementation of my defmulti I'd have to
add another require. But maybe that isn't such a bad thing so I'll go with
this approach. I prefer it over having a "super parent (*)" namespace
unless i needed that "super parent" in multiple places.
* by "super parent" I mean a namespace that is only used to include the
namespaces that contain the defmulti and defmethods
Thanks,
Cymen
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
