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Teemu Antti-Poika  
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 More options Jun 22 2008, 4:19 pm
From: Teemu Antti-Poika <antti...@gmail.com>
Date: Sun, 22 Jun 2008 13:19:07 -0700 (PDT)
Local: Sun, Jun 22 2008 4:19 pm
Subject: Problem with Comparator
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Hi folks,

I've just discovered Clojure (interesting stuff! Congrats!) and run
into something I could not figure out on my own. Here's a minimal
version of the problem:

(defn my-comparator [r1 r2]
  (if (< r1 r2)
    -1
    (if (= r1 r2)
      0
      1)))

(sort '(1 6 5 4) my-comparator)

In REPL this results in:
user=> java.lang.IncompatibleClassChangeError
java.lang.IncompatibleClassChangeError
        at clojure.fns.clojure.sort__669.invoke(boot.clj:1266)
        at clojure.lang.AFn.applyToHelper(AFn.java:186)
        at clojure.lang.AFn.applyTo(AFn.java:175)
        at clojure.lang.Compiler$InvokeExpr.eval(Compiler.java:2569)
        at clojure.lang.Compiler.eval(Compiler.java:3780)
        at clojure.lang.Repl.main(Repl.java:75)

What's this about? Any ideas?

My version of clojure jar is the latest on sourceforge (at the time of
writing).


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Rich Hickey  
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 More options Jun 22 2008, 4:25 pm
From: Rich Hickey <richhic...@gmail.com>
Date: Sun, 22 Jun 2008 13:25:12 -0700 (PDT)
Local: Sun, Jun 22 2008 4:25 pm
Subject: Re: Problem with Comparator
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On Jun 22, 4:19 pm, Teemu Antti-Poika <antti...@gmail.com> wrote:

The comparator goes first:

(sort my-comparator '(1 6 5 4))
-> (1 4 5 6)

Rich


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Teemu Antti-Poika  
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 More options Jun 23 2008, 12:58 am
From: Teemu Antti-Poika <antti...@gmail.com>
Date: Sun, 22 Jun 2008 21:58:09 -0700 (PDT)
Local: Mon, Jun 23 2008 12:58 am
Subject: Re: Problem with Comparator
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On Jun 22, 11:25 pm, Rich Hickey <richhic...@gmail.com> wrote:

> On Jun 22, 4:19 pm, Teemu Antti-Poika <antti...@gmail.com> wrote:

> > (sort '(1 6 5 4) my-comparator)

> > In REPL this results in:
> > user=> java.lang.IncompatibleClassChangeError
> > java.lang.IncompatibleClassChangeError

> The comparator goes first:

> (sort my-comparator '(1 6 5 4))
> -> (1 4 5 6)

> Rich

And so it seems to go - my bad!

Sorry to waste your time with that one, but thanks! :)

Teemu


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