Data.Extensible.Match

Pattern matching

Documentation

newtype Match h a x

Turn a wrapper type into one clause that returns a.

Constructors

Match

Fields

runMatch :: h x -> a

Instances

Typeable ((k -> *) -> * -> k -> *) (Match k)

clause :: x ∈ xs => Lens' (Match h a :* xs) (h x -> a)

A lens for a specific clause.

match :: (Match h a :* xs) -> (h :| xs) -> a

O(log n) Perform pattern matching.

mapMatch :: (a -> b) -> Match h a x -> Match h b x

Applies a function to the result of Match.

caseOf :: (h :| xs) -> (Match h a :* xs) -> a infix 0

Flipped match