smimou changed the topic of #ocaml to: OCaml 3.08.3 available! | Archive of Caml Weekly News: http://sardes.inrialpes.fr/~aschmitt/cwn/ | A free book: http://cristal.inria.fr/~remy/cours/appsem/ | Mailing List: http://caml.inria.fr/bin/wilma/caml-list/ | Cookbook: http://pleac.sourceforge.net/
<Enveigler_> Is someting like let g = (Gdk.Rectangle) in let ( x, y, width, height ) = map g, [x,y,width, height] in ...
<Enveigler_> possible?
<TeXitoi> I don't think, but I don't know the object model, so I can be wrong
<Enveigler_> Hmm. I /thought/ that this was a general syntax question rather than a matter applicable to a specific class or data structure. It just seems tehre ought to be a more general way of accessing a bunch of members that binding each one in a separate let statement. or even using the full name explicitly for each member in let ( v1,v2,v3) = ( e1, e2, e3 ) in ...
<Demitar> Define a function?
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<Enveigler> Is #ocaml archived anywhere?
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<Demitar> I seem to recall that but I don't know where.
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<mflux_> enveigler_, I think you could write let module R = Gdk.Rectangle in let x = R.x area in ..
<mflux_> hm
<mflux_> or is Gdk.Rectangle a module? it would look like it is, with a function x with one argument?
<mflux_> if it was just a struct wouldn't you rather write let x = area.Gdk.Rectangle.x
<mflux_> well, if it were a struct would could write match area with {Gdk.Rectangle.x = x; y = y} -> ..
<mflux_> enveigler_, also, you could write your own language extension for that ;)
<Enveigler_> Thanks mflux_.
<Enveigler_> I tried
<Enveigler_> let R = Gdk.Rectangle in
<Enveigler_> let ( x, y, width, height ) = (
<Enveigler_> R.x area,
<Enveigler_> R.y area,
<Enveigler_> R.width area,
<Enveigler_> R.height area
<Enveigler_> ) in
<Enveigler_> but got "Unbound constructor R"
<Enveigler_> I'm still trying to get a feel for Ocaml syntax, so writing a langauge extension is probably beyind me (for a day oor two :) )
<mflux_> let _module_ R = ..
<Enveigler_> AH..
<Enveigler_> Perfect. Works a treat. Thankyou muchly.
<mflux_> there is also the openin-extension in caml humps
<Enveigler_> More reading :)
<mflux_> which allows you to write like open Gdk.Rectangle in let x = x area
<Enveigler_> I've used open (with Graphics) which definitly cuts down on the syntax involved. I'll look into that. Thanks again.
<mflux_> happy to help a fellow ocamler ;)
<Enveigler_> I'm not sure I qualify as one yet--but I'm trying ;)
<Enveigler_> Instinct make me want to do just 'let x = area.x' or even 'let ( x, y, width, height ) = map area, [ x, y, width, height ] in ', but I guess that's just silly.
<mflux_> hmh, infact you could write let [x, y, h, w] = List.map (fun f -> f area) [R.x, R.y, R.width, R.height] in .. but that would cause compile time warning
<mflux_> make that R.x; R.y; etc instead
<mflux_> (and [x; y..] too)
<mflux_> or you could reverse that with match and handle the case that never happens
<Enveigler_> That's nice, but gives the warning. Now to try and understand the " reverse that with match and handle the case that never happens" bit.
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<mflux_> you could just define a function let tuple4_of_list l = match l with [a, b, c, d] -> a, b, c, d | _ -> failwith ":-("
<mflux_> and then write let x, y, h, w = tuple4_of_list (List.map ..)
<mflux_> again, [a; b; c; d] :-)
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