Re: Records implementing IFn
Thank you. That seems to do the trick.
-Mark
On Feb 7, 11:55 pm, Alex Osborne wrote:
> Mark Fredrickson writes:
> > Is the following behavior correct or a bug:
>
> > user> (defrecord Example [data] clojure.lang.IFn (invoke [this] this)
> > (invoke [this n] (repeat n this)))
> > user.Example
> > user> (def e (Example. "I am e"))
> > #'user/e
> > user> (e 2)
> > (#:user.Example{:data "I am e"} #:user.Example{:data "I am e"})
> > user> (def some-es (e 5))
> > ; Throws java.lang.AbstractMethodError
>
> > I can't tell if I am doing something wrong with respect to the IFn
> > definition, or if I am encountering a bug.
>
> I think you need to implement applyTo for a properly working IFn
> implementation:
>
> (defrecord Example [data] clojure.lang.IFn
> (invoke [this] this)
> (invoke [this n] (repeat n this))
> (applyTo [this args] (clojure.lang.AFn/applyToHelper this args)))
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Re: Records implementing IFn
Mark Fredrickson writes:
> Is the following behavior correct or a bug:
>
> user> (defrecord Example [data] clojure.lang.IFn (invoke [this] this)
> (invoke [this n] (repeat n this)))
> user.Example
> user> (def e (Example. "I am e"))
> #'user/e
> user> (e 2)
> (#:user.Example{:data "I am e"} #:user.Example{:data "I am e"})
> user> (def some-es (e 5))
> ; Throws java.lang.AbstractMethodError
>
> I can't tell if I am doing something wrong with respect to the IFn
> definition, or if I am encountering a bug.
I think you need to implement applyTo for a properly working IFn
implementation:
(defrecord Example [data] clojure.lang.IFn
(invoke [this] this)
(invoke [this n] (repeat n this))
(applyTo [this args] (clojure.lang.AFn/applyToHelper this args)))
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Records implementing IFn
Is the following behavior correct or a bug:
user> (defrecord Example [data] clojure.lang.IFn (invoke [this] this)
(invoke [this n] (repeat n this)))
user.Example
user> (def e (Example. "I am e"))
#'user/e
user> e
#:user.Example{:data "I am e"}
user> (e 2)
(#:user.Example{:data "I am e"} #:user.Example{:data "I am e"})
user> (e)
#:user.Example{:data "I am e"}
user> (def some-es (e 5))
; Throws java.lang.AbstractMethodError
I can't tell if I am doing something wrong with respect to the IFn
definition, or if I am encountering a bug.
I have not tried building up a deftype by hand. That may well solve my
problem and would be a perfectly acceptable solution. I started with a
record to hold immutable data and implement the meta-data protocol,
but I could implement these on a type (perhaps dropping another
protocol/interface if it is causing the problem above).
Thanks in advance,
-Mark
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