Hi Paul, I have implemented at least the doseq equivalent in a library of my own called state-node: https://github.com/lgrapenthin/state-node. It implements gochan and gochan-and. gochan lets you bind a binding-form to a channel but also lets you recur (if you bind things aside from the channel). It terminates the loop when the channel is closed. With gochan-and you can specify one form that will be evaluated after the channel is closed (e. g. close a target channel).
E. g.: (gochan-and (close! out-chan) [taken-val in-chan] (println "Value read from in-chan:" taken-val) (>! out-chan taken-val)) Please feel free to copy the macro directly from the library if you have any use for it :) Maybe also have a look at reducep-hidden (adapted from hidden automatons from ELM) which kinda lets you do the same if you aren't going for side-effects or custom looping conditions. One problem with the lazy-sequence thing would be that such sequences would only work in go-blocks if I my thinking is right this morning. Best regards, Leon. On Tuesday, November 12, 2013 11:48:09 AM UTC+1, Paul Butcher wrote: > > I've been playing with core.async, and have come across a couple of things > that it seemed would probably be common use cases, but can't find anything > in the library that addresses them. > > I'd be grateful for pointers if any of these do exist and I'm just missing > them, or suggestions for reasons why I don't really want them and should be > tackling the problem in a different way: > > > - A way to convert a channel to a lazy sequence (i.e. build the > sequence by repeatedly reading from a channel until it's closed). It seems > odd that core.async provides a means to turn a lazy sequence into a > channel > (to-chan) but not the inverse? > - An equivalent of doseq for a channel, which repeatedly reads from > the channel and calls its body with the result of doing so, terminating > when the channel is closed. > > > Of course, both of these are easy enough to write, but I'm wondering > whether the fact that they aren't provided as standard is telling me > something? > > -- > paul.butcher->msgCount++ > > Silverstone, Brands Hatch, Donington Park... > Who says I have a one track mind? > > http://www.paulbutcher.com/ > LinkedIn: http://www.linkedin.com/in/paulbutcher > Skype: paulrabutcher > > > > > -- -- 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 Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
