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Type 01->boolean.

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This commit is contained in:
Sergiu Ivanov 2022-03-05 13:07:44 +01:00
parent 687aea5337
commit b026f74f39
2 changed files with 22 additions and 19 deletions
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9
scribblings/utils.scrbl
View file

@ -498,3 +498,12 @@ Converts any non-@racket[#f] value to 1 and @racket[#f] to 0.
(any->01 #f)
(any->01 'hello)
]}
@defproc[(01->boolean [x (U Zero One)]) Boolean]{
Converts 0 to @racket[#f] and 1 to @racket[#t].
@examples[#:eval utils-evaluator
(01->boolean 0)
(01->boolean 1)
]}

32
utils.rkt
View file

@ -25,7 +25,8 @@
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 boolean-power/stream any->01)
cartesian-product/stream boolean-power boolean-power/stream any->01
01->boolean)
(define-type Variable Symbol)
(define-type (VariableMapping A) (Immutable-HashTable Variable A))
@ -550,6 +551,15 @@
(test-case "any->01"
(check-equal? (any->01 #t) 1)
(check-equal? (any->01 #f) 0)))
(: 01->boolean (-> (U Zero One) Boolean))
(define (01->boolean x)
(case x [(0) #f] [else #t]))
(module+ test
(test-case "01->boolean"
(check-equal? (01->boolean 0) #f)
(check-equal? (01->boolean 1) #t)))
)
(require 'typed)
@ -561,13 +571,12 @@
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 boolean-power/stream any->01)
cartesian-product/stream boolean-power boolean-power/stream any->01
01->boolean)
;;; Untyped section.
(provide
;; Functions
(contract-out [01->boolean (-> (or/c 0 1) boolean?)])
;; Contracts
(contract-out [variable-mapping? contract?]
[string-variable-mapping? contract?]
@ -586,18 +595,3 @@
(define (general-pair/c key-contract val-contract)
(or/c (list/c key-contract val-contract)
(cons/c key-contract val-contract)))
;;; ==================
;;; Boolean operations
;;; ==================
;;; Converts 0 to #f and 1 to #t
(define (01->boolean x)
(case x [(0) #f] [else #t]))
(module+ test
(test-case "01->boolean"
(check-equal? (01->boolean 0) #f)
(check-equal? (01->boolean 1) #t)))