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| author | Hugo Hörnquist <hugo@lysator.liu.se> | 2019-04-03 22:52:09 +0200 |
|---|---|---|
| committer | Hugo Hörnquist <hugo@lysator.liu.se> | 2019-04-03 22:52:09 +0200 |
| commit | 780aa6593685a9b17dd64dfbdc179f1e2b048ec8 (patch) | |
| tree | 2fbdee521e0f6f63227f4f68a4363f6862da9f06 | |
| parent | Move examples from recurrence internal to tests. (diff) | |
| download | calp-780aa6593685a9b17dd64dfbdc179f1e2b048ec8.tar.gz calp-780aa6593685a9b17dd64dfbdc179f1e2b048ec8.tar.xz | |
Add stream-find.
| -rw-r--r-- | module/srfi/srfi-41/util.scm | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/module/srfi/srfi-41/util.scm b/module/srfi/srfi-41/util.scm index 5bef95cb..2492d088 100644 --- a/module/srfi/srfi-41/util.scm +++ b/module/srfi/srfi-41/util.scm @@ -21,9 +21,12 @@ (m ms (stream-car+cdr min))) (stream-cons m (interleave-streams < (cons ms other))))))) -;;; Varför är allting så långsamt‽‽‽‽‽‽‽‽ - (define-public (filter-sorted-stream proc stream) (stream-take-while proc (stream-drop-while (negate proc) stream))) + +(define-public (stream-find pred stream) + (cond ((stream-null? stream) #f) + ((pred (stream-car stream)) (stream-car stream)) + (else (stream-find pred (stream-cdr stream))))) |