Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly
Appearance settings

add Applicative and Monad instances for Label #164

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
subttle wants to merge 1 commit into
base: main
Choose a base branch
Loading
from
Open

add Applicative and Monad instances for Label #164

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
17 changes: 17 additions & 0 deletions 17 src/Algebra/Graph/Label.hs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -408,6 +408,23 @@ instance StarSemiring (Label a) where
star (Star x) = star x
star x = Star x

instance Applicative Label where
pure = Symbol
Zero <*> _ = Zero
One <*> _ = One
(Symbol x) <*> z = fmap x z
(x :+: y) <*> z = (x <*> z) :+: (y <*> z)
(x :*: y) <*> z = (x <*> z) :*: (y <*> z)
(Star x) <*> z = Star (x <*> z)

instance Monad Label where
Zero >>= _ = Zero
One >>= _ = One
(Symbol x) >>= f = f x
(x :+: y) >>= f = (x >>= f) :+: (y >>= f)
(x :*: y) >>= f = (x >>= f) :*: (y >>= f)
(Star x) >>= f = Star (x >>= f)

-- | Check if a 'Label' is 'zero'.
isZero :: Label a -> Bool
isZero Zero = True
Expand Down
Morty Proxy This is a proxified and sanitized view of the page, visit original site.