Re: Surprising behaviour related to records, protocols and AOT
I guess extend-type does changes only to generated java class and the var
defrecordissue.arecord-ARecord
contains the 'old' version of ARecord constructor. Obviously it would be
weird for defprotocol to change the variable in another namespace.
Especially when you can extend a record from anywhere.
So If you want to create a record that implements your protocol via var
from record namespace, you should do some hackery to update that variable.
I've done a pull-request for you, but using direct constructor will be more
idiomatic
;
; this won't work unless you update manualy a variable -ARecord in the
namespace
;
;(defrecordissue.aprotocol/afn (defrecordissue.arecord/-ARecord))
;
; like
(defmacro from-ns[nmsps body]
launches body from namespace
`(binding
[*ns* (find-ns ~nmsps)]
(eval
(quote (do ~@body)
(from-ns 'defrecordissue.arecord
(import '(defrecordissue.arecord.ARecord))
(alter-var-root
('-ARecord (ns-publics 'defrecordissue.arecord))
(fn[x] (fn[] (new ARecord)
(println (defrecordissue.aprotocol/afn
(defrecordissue.arecord/-ARecord)))
; 42
ndrw
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Re: Surprising behaviour related to records, protocols and AOT
I guess you have to import defrecord generated class before you want to use it, check the sample from clojuredocs about defrecord ; If you define a defrecord in one namespace and want to use it ; from another, first require the namespace and then import ; the record as a regular class. ; The require+import order makes sense if you consider that first ; the namespace has to be compiled--which generates a class for ; the record--and then the generated class must be imported. ; (Thanks to raek in #clojure for the explanations!) ; Namespace 1 in my/data.clj, where a defrecord is declared (ns my.data) (defrecord Employee [name surname]) ; Namescape 2 in my/queries.clj, where a defrecord is used (ns my.queries (:require my.data) (:import [my.data Employee])) (println Employees named Albert: (filter #(= Albert (.name %)) [(Employee. Albert Smith) (Employee. John Maynard) (Employee. Albert Cheng)])) -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: documentation for clojure core extension points - multimethods and protocols?
I guess you should just grep clojure core source for defprotocol, defmulti and so on. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
