Hi,
Because clojure set, vector and map all implements
java.util.Comparator (indirectly via AFn), they interact with
java.util.TreeSet/TreeMap in surprising way due to overloaded ctor
(java.util.Comparator).
user=> (def s (java.util.TreeSet. [1 2 3 3]))
#'user/s
user=> s
#=(java.util.TreeSet. #{})
user=> (.add s 3)
true
user=> s
#=(java.util.TreeSet. #{3})
user=> (.add s 3)
java.lang.RuntimeException: java.lang.IllegalArgumentException: Wrong
number of args passed to: PersistentVector (NO_SOURCE_FILE:0)
user=> (def m (java.util.TreeMap. {:a 1 :b 2 }))
#'user/m
user=> m
#=(java.util.TreeMap. {})
user=> (.put m :a 2)
nil
user=> m
#=(java.util.TreeMap. {:a 2})
user=> (.put m :c 3)
java.lang.RuntimeException: java.lang.ClassCastException:
clojure.lang.Keyword (NO_SOURCE_FILE:0)
Is this an oversight or a compromise by design?
regards,
- Feng
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