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Diffstat (limited to 'algebraic-structures.private.stream.applicative.scm')
-rw-r--r-- | algebraic-structures.private.stream.applicative.scm | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/algebraic-structures.private.stream.applicative.scm b/algebraic-structures.private.stream.applicative.scm new file mode 100644 index 0000000..0389ad9 --- /dev/null +++ b/algebraic-structures.private.stream.applicative.scm @@ -0,0 +1,17 @@ +(module (algebraic-structures private stream applicative) () + (import scheme + (srfi 41) + (only (chicken base) cute) + (chicken module)) + (export pure map2) + (reexport (algebraic-structures stream functor)) + + (define (pure x) (stream x)) + + (define-stream (product op s1 s2) + (if (stream-null? s1) + stream-null + (stream-append (stream-map (cute op (stream-car s1) <>) s2) + (product op (stream-cdr s1) s2)))) + + (define map2 product)) |