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| author |  Adam Chlipala <adam@chlipala.net> | 2011-08-15 10:22:09 -0400 |
|---|---|---|
| committer | Adam Chlipala <adam@chlipala.net> | 2011-08-15 10:22:09 -0400 |
| commit | 25058933836f66d25176cef718d59f96102b8a3e (patch) | |
| tree | d53efdcd64e016a6688ce67cb5b5b37c0758e9f6 /lib/ur/list.ur | |
| parent | 6116a76264c90c2d70daf616253d56ddfd8086b0 (diff) | |
List.mapXi
Diffstat (limited to 'lib/ur/list.ur')
| -rw-r--r-- | lib/ur/list.ur | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/ur/list.ur b/lib/ur/list.ur index 2679d877..35440de2 100644 --- a/lib/ur/list.ur +++ b/lib/ur/list.ur @@ -133,6 +133,16 @@ fun mapX [a] [ctx ::: {Unit}] f = mapX' end +fun mapXi [a] [ctx ::: {Unit}] f = + let + fun mapX' i ls = + case ls of + [] => <xml/> + | x :: ls => <xml>{f i x}{mapX' (i + 1) ls}</xml> + in + mapX' 0 + end + fun mapM [m ::: (Type -> Type)] (_ : monad m) [a] [b] f = let fun mapM' acc ls = |