On Wednesday, April 26, 2017 at 9:48:56 AM UTC-7, David K. Storrs wrote: > On Wed, Apr 26, 2017 at 12:21 AM, Jon Zeppieri <zepp...@gmail.com> wrote: > I don't know that there's a right way, but if your functions are > > nullary, then promises are a decent fit: > > > > (define conf > > (delay > > (with-input-from-file ...))) > > > > Then just (force conf) whenever you want the value. > > > > Yeah, that works well. Thanks! > > > Any thoughts on how to do it for non-nullary functions?
For non-nullary functions, you're looking for memoization / caching. There's a couple packages that do this, along with relate - In the `sugar` package, the `sugar/cache` module gives you exactly this, in the form of a `define/caching` macro. - The `tmemoize` package provides similar functionality for Typed Racket functions. - The `with-cache` package gives you promise-like behavior for thunks that use an external storage system. - The `remember` package gives you caching behavior for compile-time expressions that can be remembered across compilation runs. -- 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. For more options, visit https://groups.google.com/d/optout.
