I am parsing a file and to compare the current line
with the previous line of the file. I am using line-seq
to go thru the file and I thought I would create a
ref to store the previous line. When I want to update
the previous line value I can't seem to do it. I've
never used refs before so I'm sure I'm doing something
very stupid.
(defstruct line :lat :lon :name)
(defn convert [file]
(let [prev-line (ref (struct line))]
(with-open [r (reader file)]
(doseq [l (line-seq r)]
(let [ps (split #"," l)
c-line (struct line (ps 0) (ps 1) (ps 2))]
(if (not= c-line @pre-line)
(do ; do stuff here then update pre-line
(dosync ref-set pre-line (apply struct line (vals c-line)))
(println @pre-line)))))))) ; this prints out all nils
doesn't seem to work
Sorry if this email is not formatted correctly. Something is wrong with my
browser
currently typing in a textarea. Thanks.
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