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try to improve docs for `make-keyword-procedure'

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This commit is contained in:
Matthew Flatt 2012-03-31 07:45:53 -06:00
parent cb438298cd
commit c83df32440
1 changed files with 22 additions and 6 deletions
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28
collects/scribblings/reference/procedures.scrbl
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@ -235,18 +235,26 @@ list is also in the second list.
procedure?]{ procedure?]{
Returns a procedure that accepts all keyword arguments (without Returns a procedure that accepts all keyword arguments (without
requiring any keyword arguments). See also requiring any keyword arguments).
@racket[procedure-reduce-keyword-arity].
When the result is called with keyword arguments, then @racket[proc] When the procedure returned by @racket[make-keyword-procedure]
is called with keyword arguments, then @racket[proc]
is called; the first argument is a list of distinct keywords sorted by is called; the first argument is a list of distinct keywords sorted by
@racket[keyword<?], the second argument is a parallel list containing a @racket[keyword<?], the second argument is a parallel list containing a
value for each keyword, and the remaining arguments are the value for each keyword, and the remaining arguments are the
by-position arguments. by-position arguments.
When the result is called without keyword arguments, then When the procedure returned by @racket[make-keyword-procedure]
@racket[plain-proc] is called. Furthermore, @racket[procedure-arity] is called without keyword arguments, then
obtains its result from @racket[plain-proc]. @racket[plain-proc] is called---possibly more efficiently than
dispatching through @racket[proc]. Normally, @racket[plain-proc]
should have the same behavior as calling @racket[proc] with empty lists as
the first two arguments, but that correspondence is in no way
enforced.
The result of @racket[procedure-arity] and @racket[object-name] on the
new procedure is the same as for @racket[plain-proc]. See also
@racket[procedure-reduce-keyword-arity] and @racket[procedure-rename].
@defexamples[ @defexamples[
(define show (define show
@ -255,6 +263,14 @@ obtains its result from @racket[plain-proc].
(show 1) (show 1)
(show #:init 0 1 2 3 #:extra 4) (show #:init 0 1 2 3 #:extra 4)
(define show2
(make-keyword-procedure (lambda (kws kw-args . rest)
(list kws kw-args rest))
(lambda args
(list->vector args))))
(show2 1)
(show2 #:init 0 1 2 3 #:extra 4)
]} ]}
@defproc[(procedure-reduce-keyword-arity [proc procedure?] @defproc[(procedure-reduce-keyword-arity [proc procedure?]