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Type boolean-power/stream.

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This commit is contained in:
Sergiu Ivanov 2022-03-05 00:20:51 +01:00
parent 347e17158d
commit 83b293e3e4
2 changed files with 20 additions and 13 deletions
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11
scribblings/utils.scrbl
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@ -477,4 +477,13 @@ Returns the @racket[n]-th Cartesian power of the Boolean domain.
@examples[#:eval utils-evaluator
(boolean-power 2)
]}
]}
@defproc[(boolean-power/stream [n Integer])
(Sequenceof (Listof Boolean))]{
Like @racket[boolean-power], but returns a stream.
@examples[#:eval utils-evaluator
(stream->list (boolean-power/stream 2))
]}

22
utils.rkt
View file

@ -25,7 +25,7 @@
update-vertices/unweighted update-graph dotit collect-by-key
collect-by-key/sets ht-values/list->set hash->list/ordered
multi-split-at lists-transpose in-random cartesian-product-2/stream
cartesian-product/stream boolean-power)
cartesian-product/stream boolean-power boolean-power/stream)
(define-type Variable Symbol)
(define-type (VariableMapping A) (Immutable-HashTable Variable A))
@ -534,6 +534,13 @@
(module+ test
(test-case "boolean-power"
(check-equal? (boolean-power 2) '((#f #f) (#f #t) (#t #f) (#t #t)))))
(: boolean-power/stream (-> Integer (Sequenceof (Listof Boolean))))
(define (boolean-power/stream n) (cartesian-product/stream (make-list n '(#f #t))))
(module+ test
(test-case "boolean-power/stream"
(check-equal? (stream->list (boolean-power/stream 2)) '((#f #f) (#f #t) (#t #f) (#t #t)))))
)
(require 'typed)
@ -545,14 +552,13 @@
update-vertices/unweighted update-graph dotit collect-by-key
collect-by-key/sets ht-values/list->set hash->list/ordered
multi-split-at lists-transpose in-random cartesian-product-2/stream
cartesian-product/stream boolean-power)
cartesian-product/stream boolean-power boolean-power/stream)
;;; Untyped section.
(provide
;; Functions
(contract-out [boolean-power/stream (-> number? (stream/c (listof boolean?)))]
[any->01 (-> any/c (or/c 0 1))]
(contract-out [any->01 (-> any/c (or/c 0 1))]
[01->boolean (-> (or/c 0 1) boolean?)])
;; Contracts
(contract-out [variable-mapping? contract?]
@ -578,14 +584,6 @@
;;; Boolean operations
;;; ==================
;;; Like boolean-power, but returns a stream whose elements the
;;; elements of the Cartesian power.
(define (boolean-power/stream n) (cartesian-product/stream (make-list n '(#f #t))))
(module+ test
(test-case "boolean-power/stream"
(check-equal? (stream->list (boolean-power/stream 2)) '((#f #f) (#f #t) (#t #f) (#t #t)))))
;;; Converts any non-#f value to 1 and #f to 0.
(define (any->01 x) (if x 1 0))