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doc clarification on continuation-mark-set-first performance

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This commit is contained in:
Matthew Flatt 2020-05-24 07:13:14 -06:00
parent 0473bd52f8
commit b297271a5c
1 changed files with 8 additions and 2 deletions
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10
pkgs/racket-doc/scribblings/reference/cont-marks.scrbl
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@ -150,12 +150,18 @@ reflected by @racket[mark-set] between frames that have keys in
Returns the first element of the list that would be returned by
@racket[(continuation-mark-set->list (or mark-set
(current-continuation-marks prompt-tag)) key-v prompt-tag)], or
@racket[none-v] if the result would be the empty list. The result
@racket[none-v] if the result would be the empty list.
The result
is produced in (amortized) constant time. Typically, this
result can be computed more quickly using
@racket[continuation-mark-set-first] than using
@racket[continuation-mark-set->list] or by using
@racket[continuation-mark-set->iterator] and iterating just once.}
@racket[continuation-mark-set->iterator] and iterating just once.
Although @racket[#f] and @racket[(current-continuation-marks
prompt-tag)] are equivalent for @racket[mark-set], providing @racket[#f]
as @racket[mark-set] can enable shortcuts that make it even faster.}
@defproc[(call-with-immediate-continuation-mark
[key-v any/c]