Clojure

• Type: Defect
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: Release 1.3
• Fix Version/s: None
• Component/s: None
• Labels:

  None

I'm trying to write a macro which generate reify forms using some reflection.

clojure.reflect produces type symbols similar to 'java.util.Iterator<>

Unfortunately, the compiler doesn't accept the <> syntax in type hints:

(reify Iterable (^{:tag java.util.Iterator} iterator [this] nil)) ; works

(reify Iterable (^{:tag java.util.Iterator<>} iterator [this] nil)) ;; fails
CompilerException java.lang.RuntimeException: java.lang.ClassNotFoundException: java.util.Iterator<>, compiling:(NO_SOURCE_PATH:1325)

It seems like the compiler should understand the <> just enough to strip it, rather than reject it. This would make it much easier to write correct macros involving type hinting and reflection.

The workaround I have been using is:

(defn hint
"clojure.reflect demarks generics with angle brackets, but
the compiler does not support generics in type hints"
[obj tag]
(let [tag (-> tag .toString (.replace "<>" "") symbol)]
(with-meta obj {:tag tag}))

• Assignee:

  Unassigned

  Reporter:

  Brandon Bloom

• Created:

  23/Feb/12 11:31 PM

  Updated:

  24/Feb/12 1:37 AM