Yep, that's just a typo in the email. Something was wrong with my browser and I couldn't just paste the code in :(
On Mon, Nov 24, 2008 at 3:33 PM, Shawn Hoover <[EMAIL PROTECTED]>wrote: > On Mon, Nov 24, 2008 at 5:17 PM, Brian Doyle <[EMAIL PROTECTED]>wrote: > >> 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 >> >> > Your let binds prev-line, while the code inside uses pre-line. Is that just > a typo in your email, or is that the code you're running, too? > > Shawn > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
