Middle Ground has always been mine. "Radical" is the middle name -)
On Aug 9, 2012, at 5:28 PM, Ray Racine wrote: > Little Any is my new best friend. > > On Thu, Aug 9, 2012 at 4:50 PM, Matthias Felleisen <[email protected]> > wrote: > > You can use wider types. It is one thing to be able to formulate types at all > and another to formulate the most descriptive ones, right? > > > On Aug 9, 2012, at 3:27 PM, Neil Toronto wrote: > > > On 08/09/2012 12:52 PM, Ray Racine wrote: > >> Noticed here http://www.ccs.neu.edu/home/samth/adapt/Current_Status.html > > > > I had no idea someone had been assigned. Cool! > > > >> That the Plot collection still awaits porting to TR. Has any partial > >> work been done, maybe languishing in a github repo somewhere, that can > >> be leveraged? > > > > Are you volunteering? :) > > > > It's only possible now that TR has support for keyword arguments. > > > > There's one issue that could cause problems: some renderer-producing > > functions, like `points', accept lists of vectors as arguments. If the data > > argument to `points' had a nice, general type like > > > > (Listof (Vectorof Real Real)) > > > > then applying `points' to > > > > '(#(0.0 1.0) #(1.0 2.2)) > > > > wouldn't typecheck. The problem is that TR thinks `points' might change > > that 0.0 to 0, which would make the original argument type (Listof (Vector > > Float Float)) incorrect. It thinks Bad Things could happen. (Technically, a > > vector is "invariant".) > > > > I can think of two solutions right now: > > > > 1. Wait for a Const type constructor or similar. > > > > 2. Change the contract of `points' to accept lists of pairs, sequences or a > > specialized data type. > > > > I think the contract of `points' should be changed anyway, so users can > > send it any kind of sequence. Might as well make it current-TR-friendly at > > the same time. > > > > Neil ⊥ > > > > ____________________ > > Racket Users list: > > http://lists.racket-lang.org/users > > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users > >
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