You could also use reify:
(defn make-foo [s]
(reify clojure.lang.IFn
(invoke [this] (str "Hello, " s))))
((make-foo "RJ"))
"Hello, RJ"
I have to admit, though, that I'm unclear on the relative merits of defrecord
vs. reify. Anyone want to comment?
Cheers,
-Michael Nygard
On Jun 15, 2011, at 12:57 PM, Ken Wesson wrote:
> On Wed, Jun 15, 2011 at 3:53 PM, RJ Nowling <rnowl...@gmail.com> wrote:
>> Hi,
>>
>> I'm sorry if this has been asked before, but I would like to know how
>> to create data structures in Clojure that can be used in the same way
>> as the built-in data structures. For example, I can access the
>> elements of a vector by (my-vec 1). How can I implement this
>> interface when creating a data structure in Clojure?
>
> (defrecord Foo [...]
> ...
> IFn
> (invoke [this] (do-this-on-zero-argument-call))
> (invoke [this x] (do-when-called-with-x))
> (invoke [this x y] (+ x y)))
>
> => ((Foo.) 33 9)
> 42
> =>
>
> --
> Protege: What is this seething mass of parentheses?!
> Master: Your father's Lisp REPL. This is the language of a true
> hacker. Not as clumsy or random as C++; a language for a more
> civilized age.
>
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Michael T. Nygard
mtnyg...@gmail.com
http://www.michaelnygard.com/
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