Is there any reason to use Racket’s string-append-immutable though? It might be simpler to just:
(define string-append-immutable (compose string->immutable-string string-append)) (provide string-append-immutable) since you need to define it anyway for the versions prior 7.5.0.14. On Mon, Mar 30, 2020 at 12:00 PM Sorawee Porncharoenwase < sorawee.pw...@gmail.com> wrote: > Your code would not work because prior 7.5.0.14, there’s no > string-append-immutable, so the use of string-append-immutable in the > else branch will result in an unbound id error. > > Instead, use https://docs.racket-lang.org/version-case/index.html which > will run the “if” at compile-time, making the "unbound id" go away at > compile-time. > > Another problem is that when you define string-append (or even > string-append-immutable), it will shadow Racket’s string-append (or > string-append-immutable). You might want to do something like this > instead: > > (define @string-append-immutable ... now you can use string-append-immutable > here ...) > (provide (rename-out [@string-append-immutable string-append-immutable])) > > > > On Mon, Mar 30, 2020 at 11:49 AM Siddhartha Kasivajhula < > skasi...@gmail.com> wrote: > >> Hi there, >> Is there a standard/recommended way to handle multiple versions of Racket >> in library code? >> >> For instance, this handy utility was added in a recent version of Racket: >> >> >> https://docs.racket-lang.org/reference/strings.html?q=strings#%28def._%28%28quote._~23~25kernel%29._string-append-immutable%29%29 >> >> I'd like to use it in my library code but that would probably mean that >> users with an older version of Racket wouldn't be able to use the library, >> is that right? I'm tempted to add something like: >> >> (require version/utils) >> (define string-append >> (if (version<? (version) "7.5.0.14") >> (compose string->immutable-string string-append) >> string-append-immutable)) >> >> ... at the top of the module. Is this advisable? Or is there a better, >> maybe more raco-friendly way? >> >> Thanks, >> -Sid >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Racket Users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to racket-users+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/racket-users/CACQBWFkRahhtoXKUbpcJ%2BHpYwq5FBU85Ze_NGkEntXX3kTD01g%40mail.gmail.com >> <https://groups.google.com/d/msgid/racket-users/CACQBWFkRahhtoXKUbpcJ%2BHpYwq5FBU85Ze_NGkEntXX3kTD01g%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CADcuegsPsYRE7JZa6vrAoV2fHKPLM9O9-8ghhTiR5TexyHeRSA%40mail.gmail.com.
