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documented contract-stronger?

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Robby Findler 2010-06-06 14:56:49 -05:00
parent 054ce9d21c
commit 0126324f41
1 changed files with 19 additions and 0 deletions
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19
collects/scribblings/reference/contracts.scrbl
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@ -1361,6 +1361,25 @@ Extracts the predicate from a flat contract.}
has a recorded contract attached to it.
}
@defproc[(contract-stronger? [x contract?] [y contract?]) boolean?]{
Returns @racket[#t] if the contract @racket[x] accepts either fewer
or the same number of values as @racket[y] does.
This function is conservative, so it may return @racket[#f] when
@racket[x] does, in fact, accept fewer values.
@examples[#:eval (contract-eval)
(contract-stronger? integer? integer?)
(contract-stronger? (between/c 25 75) (between/c 0 100))
(contract-stronger? (between/c 0 100) (between/c 25 75))
(contract-stronger? (between/c -10 0) (between/c 0 10))
(contract-stronger? (λ (x) (and (real? x) (<= x (random 10))))
(λ (x) (and (real? x) (<= x (+ 100 (random 10))))))]
}
@defproc[(contract-first-order-passes? [contract contract?]
[v any/c])
boolean?]{