Mercurial > urweb
changeset 1279:4c367c8f5b2d
List.mapi
author | Adam Chlipala <adamc@hcoop.net> |
---|---|
date | Sun, 13 Jun 2010 14:13:47 -0400 (2010-06-13) |
parents | cd8d2c73ccf4 |
children | 3d06e0f7a6f3 |
files | lib/ur/list.ur lib/ur/list.urs |
diffstat | 2 files changed, 12 insertions(+), 0 deletions(-) [+] |
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--- a/lib/ur/list.ur Sun Jun 13 14:13:06 2010 -0400 +++ b/lib/ur/list.ur Sun Jun 13 14:13:47 2010 -0400 @@ -101,6 +101,16 @@ mp' [] end +fun mapi [a] [b] f = + let + fun mp' n acc ls = + case ls of + [] => rev acc + | x :: ls => mp' (n + 1) (f n x :: acc) ls + in + mp' 0 [] + end + fun mapPartial [a] [b] f = let fun mp' acc ls =
--- a/lib/ur/list.urs Sun Jun 13 14:13:06 2010 -0400 +++ b/lib/ur/list.urs Sun Jun 13 14:13:47 2010 -0400 @@ -22,6 +22,8 @@ val mapPartial : a ::: Type -> b ::: Type -> (a -> option b) -> t a -> t b +val mapi : a ::: Type -> b ::: Type -> (int -> a -> b) -> t a -> t b + val mapX : a ::: Type -> ctx ::: {Unit} -> (a -> xml ctx [] []) -> t a -> xml ctx [] [] val mapM : m ::: (Type -> Type) -> monad m -> a ::: Type -> b ::: Type