Forgive me if I'm misunderstanding, but you don't need to import a
protocol to use it. If you need to actually get ahold of the protocol
(say, to implement another deftype/defrecord), you can just use
`require` or `use` to get ahold of it:
(ns stuff
(:use [com.example-ns :only [IFoo])
(:import [com.example-ns Foo]))
Then inside that ns, you can just refer to IFoo and Foo. I'm
surprised that the underscored version of the import works for a
protocol - I've never seen anyone use that before. I wonder if it's
just an oversight on my part or if that's a non-recommended use of
import...
Micah Martin just showed me a behavior very similar to this recently,
and since then I'd been thinking of protocols more like normal Clojure
data structures, and deftypes/defrecords more like Java classes.
Confirming that, if I look at the type of IFoo, it is a
clojure.lang.PersistentArrayMap, and Foo is a java.lang.class.
Colin
On Feb 5, 1:20 pm, Shantanu Kumar <[email protected]> wrote:
> When I declare using defprotocol:
>
> (defprotocol IFoo
> (bar [this] "some doc"))
>
> and then using deftype:
>
> (deftype Foo
> IFoo
> (bar [this] "from Foo::bar"))
>
> I noticed there is an interesting difference in the way I need to
> import them in another namespace:
>
> (:import
> (com.example_ns IFoo) ; importing Foo here gives error (notice
> underscore)
> (com.example-ns Foo)) ; importing IFoo here gives error (notice
> dash)
>
> Can somebody explain the rationale behind this? The dash character is
> not valid inside a Java package names so a protocol not supporting it
> is understandable. But when I deftype something, is it not supposed to
> be consumed from within Java-the-language?
>
> Shantanu
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