diff options
| author | bringert <bringert@cs.chalmers.se> | 2005-11-30 16:00:06 +0000 |
|---|---|---|
| committer | bringert <bringert@cs.chalmers.se> | 2005-11-30 16:00:06 +0000 |
| commit | cba2fcb9b118cedb603b171ac7d7581c5adb844c (patch) | |
| tree | 5f777207338134402d07486d334dcc764d933027 /transfer/lib/maybe.tr | |
| parent | 86df2a69b149c1f4ff2cb9139447f5a6faccd483 (diff) | |
Moved transfer libraries to transfer/lib
Diffstat (limited to 'transfer/lib/maybe.tr')
| -rw-r--r-- | transfer/lib/maybe.tr | 11 |
1 files changed, 11 insertions, 0 deletions
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
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