Re: (.containsKey {:one 1} :one) throws Exception
Thanks for the feedback guys. I have submitted a jira issue for the bug: http://dev.clojure.org/jira/browse/CLJ-944 By the way, tried this with Clojure 1.2.1, and there it works fine. Cheers, Alf On Sat, Mar 3, 2012 at 16:11, Herwig Hochleitner hhochleit...@gmail.comwrote: Looks like the type inferencer inserts a cast to PersistentHashMap, where it should only cast to clojure.lang.Associative (the interface on which .containsKey is defined). Also, the type inferencer picks up the wrong type from the literal, but that wouldn't matter, if it would always cast to the most general class on which a method call can be resolved. Can someone verify that explaination? kind regards -- 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 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
(.containsKey {:one 1} :one) throws Exception
Hi guys, I am wondering why this does not work:
(.containsKey {:one 1} :one)
;= ClassCastException clojure.lang.PersistentArrayMap cannot be cast to
clojure.lang.PersistentHashMap
The map is a:
(class {:one 1})
;= clojure.lang.PersistentArrayMap
And a PersistentArrayMap does have a containsKey method (
https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/PersistentArrayMap.java#L95
).
I can even find the method:
(filter #(= containsKey (.getName %)) (.getMethods (class {:one 1})))
;= (#Method public boolean
clojure.lang.PersistentArrayMap.containsKey(java.lang.Object))
Should this not be a normal reflective method lookup, why do I get a
ClassCastException?
It does work if the map gets big enough:
(.containsKey {1 1, 2 2, 3 3, 4 4, 5 5, 6 6, 7 7, 8 8, 9 9} 1)
;= true
But at this point its a different collection:
(class {1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9})
;= clojure.lang.PersistentHashMap
Cheers,
Alf
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Re: (.containsKey {:one 1} :one) throws Exception
not sure why, but this works:
user= (.containsKey ^clojure.lang.Associative {:one 1} :one)
true
2012/3/3 Alf Kristian Støyle alf.krist...@gmail.com
Hi guys, I am wondering why this does not work:
(.containsKey {:one 1} :one)
;= ClassCastException clojure.lang.PersistentArrayMap cannot be cast to
clojure.lang.PersistentHashMap
The map is a:
(class {:one 1})
;= clojure.lang.PersistentArrayMap
And a PersistentArrayMap does have a containsKey method (
https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/PersistentArrayMap.java#L95
).
I can even find the method:
(filter #(= containsKey (.getName %)) (.getMethods (class {:one 1})))
;= (#Method public boolean
clojure.lang.PersistentArrayMap.containsKey(java.lang.Object))
Should this not be a normal reflective method lookup, why do I get a
ClassCastException?
It does work if the map gets big enough:
(.containsKey {1 1, 2 2, 3 3, 4 4, 5 5, 6 6, 7 7, 8 8, 9 9} 1)
;= true
But at this point its a different collection:
(class {1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9})
;= clojure.lang.PersistentHashMap
Cheers,
Alf
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Re: (.containsKey {:one 1} :one) throws Exception
Looks like the type inferencer inserts a cast to PersistentHashMap, where it should only cast to clojure.lang.Associative (the interface on which .containsKey is defined). Also, the type inferencer picks up the wrong type from the literal, but that wouldn't matter, if it would always cast to the most general class on which a method call can be resolved. Can someone verify that explaination? kind regards -- 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
