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Add contracts to core

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This commit is contained in:
Jack Firth 2015-07-08 01:25:32 -07:00
parent c345505da6
commit 7d76d71dc2
1 changed files with 8 additions and 4 deletions
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12
lens/base/base.rkt
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@ -6,10 +6,13 @@
(require rackunit))
(provide let-lens
make-lens
focus-lens
use-applicable-lenses!
(rename-out [lens-struct? lens?]))
(contract-out [make-lens (-> (-> any/c any/c)
(-> any/c any/c any/c)
lens?)]
[focus-lens (-> lens? any/c
(values any/c (-> any/c any/c)))]
[use-applicable-lenses! (-> void?)]
[lens? predicate/c]))
(define lenses-applicable? (make-parameter #f))
@ -28,6 +31,7 @@
(require rackunit)
(check-exn exn:fail? (thunk (first-lens '(a b c)))))
(define lens? lens-struct?)
(define (make-lens getter setter)
(lens-struct getter setter))