On Nov 24, 4:55 am, Allen Rohner <aroh...@gmail.com> wrote:
> The first stumbling point I reached is that deftypes provide an
> automatic implementation for IPersistentMap, but not IFn. I attempted
> to write (instance key), which exploded, but (key instance) works just
> fine. My existing code uses (instance key) almost universally. Should
> I get used to this, or are there plans to provide a default IFn
> implementation?
I agree that it would be nice with an automatic IFn implementation if
you specify the interface. As an alternative, you could use
user> (deftype F[x] [clojure.lang.IPersistentMap clojure.lang.IFn]
(.invoke [k] (k this)))
#'user/F
user> ((F 42) :x)
42
user>
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