It looks that it is more complicated than that:
user=> (sorted-set () ())
#{()}
user=> (sorted-set {} {})
#{{}}
user=> (sorted-set #{} #{})
#{#{}}
Frantisek
On 20 Ún, 20:33, Vincent Foley <vfo...@gmail.com> wrote:
> I'm pretty sure that sorted-set works only with values that are
> instances of a class that implements Comparable.
>
> user=> (instance? Comparable [])
> true
> user=> (instance? Comparable {})
> false
> user=> (instance? Comparable ())
> false
> user=>
>
> On Feb 20, 2:21 pm, Frantisek Sodomka <fsodo...@gmail.com> wrote:
>
> > sorted-set works for vectors, but doesn't work for lists, maps and
> > sets:
> > user=> (sorted-set [1 4])
> > #{[1 4]}
> > user=> (sorted-set [1 4] [1 4])
> > #{[1 4]}
> > user=> (sorted-set [4 1] [1 4])
> > #{[1 4] [4 1]}
>
> > user=> (sorted-set '(1 4))
> > #{(1 4)}
> > user=> (sorted-set '(1 4) '(1 4))
> > java.lang.ClassCastException: clojure.lang.PersistentList cannot be
> > cast to java.lang.Comparable (NO_SOURCE_FILE:0)
>
> > user=> (sorted-set {:a 1 :b 2})
> > #{{:a 1, :b 2}}
> > user=> (sorted-set {:a 1 :b 2} {:a 1 :b 2})
> > java.lang.ClassCastException: clojure.lang.PersistentArrayMap cannot
> > be cast to java.lang.Comparable (NO_SOURCE_FILE:0)
>
> > user=> (sorted-set #{1 2})
> > #{#{1 2}}
> > user=> (sorted-set #{1 2} #{1 2})
> > java.lang.ClassCastException: clojure.lang.PersistentHashSet cannot be
> > cast to java.lang.Comparable
> > (NO_SOURCE_FILE:0)
>
> > ---
> > How does sorted-set know which value is bigger or smaller? Could this
> > functionality be exported?
> > user=> (sorted-set [4 3] [2 1])
> > #{[2 1] [4 3]}
> > user=> (> [4 3] [2 1])
> > java.lang.ClassCastException: clojure.lang.LazilyPersistentVector
> > cannot be cast to java.lang.Number (NO_SOURCE_FILE:0)
> > user=> (= [4 3] [2 1])
> > false
>
> > user=> (> "xyz" "abc")
> > java.lang.ClassCastException: java.lang.String cannot be cast to
> > java.lang.Number (NO_SOURCE_FILE:0)
>
> > Thank you, Frantisek
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