diff options
Diffstat (limited to 'lib/util.mli')
| -rw-r--r-- | lib/util.mli | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/lib/util.mli b/lib/util.mli index 6bed7e355..cf8041a0d 100644 --- a/lib/util.mli +++ b/lib/util.mli @@ -84,13 +84,17 @@ val matrix_transpose : 'a list list -> 'a list list val identity : 'a -> 'a -(** Function composition: the mathematical [∘] operator. +(** Left-to-right function composition: + + [f1 %> f2] is [fun x -> f2 (f1 x)]. - So [g % f] is a synonym for [fun x -> g (f x)]. + [f1 %> f2 %> f3] is [fun x -> f3 (f2 (f1 x))]. - Also because [%] is right-associative, [h % g % f] means [fun x -> h (g (f x))]. + [f1 %> f2 %> f3 %> f4] is [fun x -> f4 (f3 (f2 (f1 x)))] + + etc. *) -val (%) : ('a -> 'b) -> ('c -> 'a) -> 'c -> 'b +val ( %> ) : ('a -> 'b) -> ('b -> 'c) -> 'a -> 'c val const : 'a -> 'b -> 'a val iterate : ('a -> 'a) -> int -> 'a -> 'a |