From cba2fcb9b118cedb603b171ac7d7581c5adb844c Mon Sep 17 00:00:00 2001 From: bringert Date: Wed, 30 Nov 2005 16:00:06 +0000 Subject: Moved transfer libraries to transfer/lib --- transfer/lib/maybe.tr | 11 +++++++++++ 1 file changed, 11 insertions(+) create mode 100644 transfer/lib/maybe.tr (limited to 'transfer/lib/maybe.tr') diff --git a/transfer/lib/maybe.tr b/transfer/lib/maybe.tr new file mode 100644 index 000000000..02d7fe56d --- /dev/null +++ b/transfer/lib/maybe.tr @@ -0,0 +1,11 @@ +data Maybe : Type -> Type where + Nothing : (A : Type) -> Maybe A + Just : (A : Type) -> A -> Maybe A + +fromMaybe : (A : Type) -> A -> Maybe A -> A +fromMaybe _ x Nothing = x +fromMaybe _ _ (Just x) = x + +maybe : (A : Type) -> (B : Type) -> B -> (A -> B) -> Maybe A -> A +maybe _ _ x _ Nothing = x +maybe _ _ _ f (Just x) = f x \ No newline at end of file -- cgit v1.2.3