One other suggestion: you can use `define-predicate` in a Typed Racket
module to create a predicate for any type that can be checked
(define-predicate dist? (Discrete-Dist Your-Type-Here))
should define the predicate you want.
On Fri, Jul 28, 2017 at 10:23 AM, James Geddes <jged...@turing.ac.uk> wrote:
> This is likely a typed-untyped interface newbie question.
> Briefly, how can I write a contract that asserts that some value has a type
> that is defined in an imported typed/racket library?
> In more detail, I am using the math/distributions library, which is written
> in typed/racket. My module is written in untyped Racket, and I'm figuring out
> how to use contacts:
> #lang racket
> (require math/distributions) ;; this is a typed/racket library
> (define my-dist (discrete-dist '(thing-one thing-two)))
> (provide (contract-out [my-dist ???]))
> The question is: what should ??? be?. There is a distribution? predicate but
> I'd quite like to be more specific: namely, that my-dist is a discrete
> distribution. In the source of math/distributions, the following type is
> (define-type (Discrete-Dist A) (discrete-dist-struct A A))
> but I don't know how this might translate into my untyped module.
> Any help much appreciated!
> James Geddes
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