From 4f67fe6cd314ad3ca1286766f1f9f3d8c5084d48 Mon Sep 17 00:00:00 2001 From: Adam Chlipala Date: Sun, 11 Dec 2011 15:02:55 -0500 Subject: Some new List functions, based on code by Ron de Bruijn --- lib/ur/list.urs | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'lib/ur/list.urs') diff --git a/lib/ur/list.urs b/lib/ur/list.urs index 2a28d148..15204590 100644 --- a/lib/ur/list.urs +++ b/lib/ur/list.urs @@ -46,6 +46,9 @@ val foldlM : m ::: (Type -> Type) -> monad m -> a ::: Type -> b ::: Type val foldlMi : m ::: (Type -> Type) -> monad m -> a ::: Type -> b ::: Type -> (int -> a -> b -> m b) -> b -> t a -> m b +val filterM : m ::: (Type -> Type) -> monad m -> a ::: Type + -> (a -> m bool) -> t a -> m (t a) + val foldlMap : a ::: Type -> b ::: Type -> c ::: Type -> (a -> b -> c * b) -> b -> t a -> t c * b @@ -90,3 +93,8 @@ val assocAdd : a ::: Type -> b ::: Type -> eq a -> a -> b -> t (a * b) -> t (a * (** Converting records to lists *) val recToList : a ::: Type -> r ::: {Unit} -> folder r -> $(mapU a r) -> t a + +(* Divide a list into two sections at a particular 0-based position, returning the second, first, or both parts, respectively. *) +val drop : t ::: Type -> int -> list t -> list t +val take : t ::: Type -> int -> list t -> list t +val splitAt : t ::: Type -> int -> list t -> list t * list t -- cgit v1.2.3