Re: [racket-users] Struct initialization?

You can also set! the extra constructor #lang racket (struct foo [a b c] #:extra-constructor-name -foo #:transparent) (define ((foo* make-foo) a b) (make-foo a b (+ a b))) (set! -foo (foo* -foo)) (foo 1 2) ; -> (foo 1 2 3) (match (foo 1 2) [(foo _ _ c) c]) ; -> 3 However I usually

Re: [racket-users] Struct initialization?

On Fri, Mar 9, 2018 at 9:35 PM, Kevin Forchione wrote: > Is it possible to initialize a struct field based on values from > previously defined fields? Something equivalent to let* where > > >(struct foo (A B C)) > >(foo 1 2) would produce (foo 1 2 3) for

[racket-users] Struct initialization?

Is it possible to initialize a struct field based on values from previously defined fields? Something equivalent to let* where >(struct foo (A B C)) >(foo 1 2) would produce (foo 1 2 3) for example? Thanks! Kevin -- You received this message because you are subscribed to the

Re: [racket-users] "Site not secure"

It's fixed now. Cron job didn't run for some reason. Thanks for the heads up! On Fri, Mar 9, 2018 at 12:42 PM, 'John Clements' via Racket Users wrote: > > >> On Mar 9, 2018, at 8:25 AM, Tim Hanson wrote: >> >> Hi, I tried to grab the latest

Re: [racket-users] "Site not secure"

> On Mar 9, 2018, at 8:25 AM, Tim Hanson wrote: > > Hi, I tried to grab the latest racket version from download.racket-lang.org > and chrome and edge tell me the certificate of the site at > mirror.racket-lang.org is not yet valid or expired. It's no problem as I > found a

Re: [racket-users] Accessing Hardware with Racket

It depends on the hardware, and what you want to do with it.  For a lot of hardware on GNU/Linux and other Unix-ish systems, you can do some things just by doing normal Racket I/O to a device file under the directory "/dev/".  On Linux, there are also some useful device-related interface files

[racket-users] "Site not secure"

Hi, I tried to grab the latest racket version from download.racket-lang.org and chrome and edge tell me the certificate of the site at mirror.racket-lang.org is not yet valid or expired. It's no problem as I found a mirror with a valid certificate, but I guess you'll want to renew the

[racket-users] Accessing Hardware with Racket

Can anyone point me to documentation / library functions to access hardware through Racket? For instance, I would like to access the CD-ROM drive to be able to calculate a SHA-256 of the entire contents of the disc in a CD drive. Has anyone considered writing a tutorial on hardware I/O with