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authorGravatar Adam Chlipala <adam@chlipala.net>2011-08-21 13:41:57 -0400
committerGravatar Adam Chlipala <adam@chlipala.net>2011-08-21 13:41:57 -0400
commitc0bc51a495cc806fe18b7cd3bee63be6c0f7cf3e (patch)
tree048f39efd512e604237cc836a8b2ee536ac75c57 /lib/ur
parent73ec19ef86ac9aca7f2b710cd29c9107ff7d5914 (diff)
Fix another list unurlification segfault bug; List.foldlMi
Diffstat (limited to 'lib/ur')
-rw-r--r--lib/ur/list.ur12
-rw-r--r--lib/ur/list.urs3
2 files changed, 15 insertions, 0 deletions
diff --git a/lib/ur/list.ur b/lib/ur/list.ur
index 35440de2..6a754287 100644
--- a/lib/ur/list.ur
+++ b/lib/ur/list.ur
@@ -255,6 +255,18 @@ fun foldlM [m] (_ : monad m) [a] [b] f =
foldlM'
end
+fun foldlMi [m] (_ : monad m) [a] [b] f =
+ let
+ fun foldlMi' i acc ls =
+ case ls of
+ [] => return acc
+ | x :: ls =>
+ acc <- f i x acc;
+ foldlMi' (i + 1) acc ls
+ in
+ foldlMi' 0
+ end
+
fun all [m] f =
let
fun all' ls =
diff --git a/lib/ur/list.urs b/lib/ur/list.urs
index 851d74bc..2a28d148 100644
--- a/lib/ur/list.urs
+++ b/lib/ur/list.urs
@@ -43,6 +43,9 @@ val exists : a ::: Type -> (a -> bool) -> t a -> bool
val foldlM : m ::: (Type -> Type) -> monad m -> a ::: Type -> b ::: Type
-> (a -> b -> m b) -> b -> t a -> m b
+val foldlMi : m ::: (Type -> Type) -> monad m -> a ::: Type -> b ::: Type
+ -> (int -> a -> b -> m b) -> b -> t a -> m b
+
val foldlMap : a ::: Type -> b ::: Type -> c ::: Type
-> (a -> b -> c * b) -> b -> t a -> t c * b