Moreover, if you're going to extend a particular protocol to many types,
it's better to use 'extend-protocol' which expands to a bunch of
'extend-type' forms...if you need a point of reference I recently
finished extending a 'DataSet' protocol to all clojure/java
data-structures. YOu can find it here :
https://github.com/jimpil/hotel-nlp/blob/master/src/hotel_nlp/tools/normalito/core.clj
500 lines of pure protocol extension points! It is that long because a
requirement of mine was not to output the same type as the input.
Jim
On 02/08/13 11:55, Jim - FooBar(); wrote:
your extension point on Number is never fired because 10 is a Long.
Generally speaking extending protocols to interfaces is not
suggested...I've been bitten a couple of times in particular whenever
I'm extending to 2 different interfaces that *are* related...You can
certainly do it but you have to have sure that your top interface
comes first than the others.
Your example is actually fine...try "(hello (int 10))" - you should
see "hello"
Jim
On 02/08/13 11:44, Phillip Lord wrote:
I want to use extend-type to support a protocol both on a class and it's
subclasses. But I don't know how to do a superclass call. So for
instance, with this code....
(defprotocol PThree
(hello [this]))
(extend-type
Number PThree
(hello [this]
(if (= 10 this)
"hello")))
(extend-type
Long PThree
(hello [this]
(if (= 5 this)
"goodbye")))
;; this return "goodbye"
(hello 5)
;; this returns nil
(hello 10)
I really want (hello 10) to return "hello". But the extend-type of Long
takes precedence. How can I call the implementation on the superclass
instead?
Phil
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