On 21 March 2010 20:40, Mark Engelberg <mark.engelb...@gmail.com> wrote:
> Speaking of overriding methods, what am I doing wrong here:
> (deftype Piece [#^int number #^char letter]
> Comparable
> (compareTo [x y]
> (let [c1 (compare (:number x) (:number y))]
> (if (zero? c1) (compare (:letter x) (:letter y)) c1))))
deftype expects method definitions *not* to accept an explicit "self"
argument. You need to do something like this instead:
(deftype Piece [#^int number #^char letter]
Comparable
(compareTo
[x]
(let [c1 (compare number (:number x))]
(if (zero? c1) (compare letter (:letter x)) c1))))
Note that own fields can be accessed by name. If you do need a "self"
argument, you can create an implicit self available to all method
bodies by passing
:as some-symbol
to the deftype right after the fields vector.
Sincerely,
Michał
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