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Add examples of function types with keyword arguments.

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This commit is contained in:
Vincent St-Amour 2013-02-21 10:49:17 -05:00
parent 034d7245a4
commit e69f66fd00
1 changed files with 9 additions and 2 deletions
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11
collects/typed-racket/scribblings/reference/types.scrbl
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@ -426,12 +426,19 @@ functions and continuation mark functions.
second occurrence of @racket[...] is literal, and @racket[bound] second occurrence of @racket[...] is literal, and @racket[bound]
must be an identifier denoting a type variable. In the fourth form, must be an identifier denoting a type variable. In the fourth form,
there must be only one @racket[dom] and @racket[pred] is the type there must be only one @racket[dom] and @racket[pred] is the type
checked by the predicate. checked by the predicate. @racket[dom] can include both mandatory and
optional keyword arguments.
@ex[(λ: ([x : Number]) x) @ex[(λ: ([x : Number]) x)
(λ: ([x : Number] . [y : String *]) (length y)) (λ: ([x : Number] . [y : String *]) (length y))
ormap ormap
string?]} string?
(:print-type file->string)
(: is-zero? : Number #:equality (Number Number -> Any) [#:zero Number] -> Any)
(define (is-zero? n #:equality equality #:zero [zero 0])
(equality n zero))
(is-zero? 2 #:equality =)
(is-zero? 2 #:equality eq? #:zero 2.0)]}
@defidform[Procedure]{is the supertype of all function types.} @defidform[Procedure]{is the supertype of all function types.}