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| author |  Adam Chlipala <adam@chlipala.net> | 2017-02-01 09:24:17 -0500 |
|---|---|---|
| committer | Adam Chlipala <adam@chlipala.net> | 2017-02-01 09:24:17 -0500 |
| commit | 59454c9766685b381603aaf116bb43a9515dbdba (patch) | |
| tree | 47b836f3e04babac7337e53c80ec972a3f0ea5c0 | |
| parent | 41cd154483d45c5d2fb0abf392b9bdc63d42b94e (diff) | |
Option.app
| -rw-r--r-- | lib/ur/option.ur | 5 | ||||
| -rw-r--r-- | lib/ur/option.urs | 1 |
2 files changed, 6 insertions, 0 deletions
diff --git a/lib/ur/option.ur b/lib/ur/option.ur index 05c50d1f..baa08466 100644 --- a/lib/ur/option.ur +++ b/lib/ur/option.ur @@ -40,6 +40,11 @@ fun mp [a] [b] f x = None => None | Some y => Some (f y) +fun app [m] [a] (_ : monad m) (f : a -> m {}) x = + case x of + None => return () + | Some y => f y + fun bind [a] [b] f x = case x of None => None diff --git a/lib/ur/option.urs b/lib/ur/option.urs index 126999a3..c30c40e7 100644 --- a/lib/ur/option.urs +++ b/lib/ur/option.urs @@ -9,6 +9,7 @@ val isNone : a ::: Type -> t a -> bool val isSome : a ::: Type -> t a -> bool val mp : a ::: Type -> b ::: Type -> (a -> b) -> t a -> t b +val app : m ::: (Type -> Type) -> a ::: Type -> monad m -> (a -> m {}) -> t a -> m {} val bind : a ::: Type -> b ::: Type -> (a -> option b) -> t a -> t b val get : a ::: Type -> a -> option a -> a |