2010/1/10 Nicolas Buduroi <nbudu...@gmail.com>:
> That was it, thanks a lot.
Ah great. My understanding is that type meta data should go on the
object not the var, but that integers for example do not support meta
data as they are java objects. Only things like vectors and hash maps
do. So you can not set an integer 'type' unless you put it in a IObj
container.
It is possible to make the :default print-method only attempt to
vary-meta if o is indeed an IObj:
(defmethod print-method :default [o, #^java.io.Writer w]
(if (instance? clojure.lang.IObj o)
(print-method (vary-meta o #(dissoc % :type)) w)
(.write w (str o))))
user=> (defbar fuz 1)
#'user/fuz
But I doubt this is really what you are aiming for
user=> (type fuz)
java.lang.Integer
user=> (type (var fuz))
:user/MyType
I think you would want (type fuz) to be :user/MyType, which I do not
think is possible with integers
user=> (type (vary-meta [1 2 3] assoc :type :user/MyType))
:user/MyType
user=> (type (vary-meta 1 assoc :type :user/MyType))
java.lang.ClassCastException: java.lang.Integer cannot be cast to
clojure.lang.IObj (NO_SOURCE_FILE:0)
So I think the source of the exception is clear, but have you found a
solution to your original problem? Maybe if you expand on that someone
can describe a good technique.
Regards,
Tim.
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