transformers-0.4.1.0: Concrete functor and monad transformers

Portabilityportable
Stabilityexperimental
Maintainerross@soi.city.ac.uk
Safe HaskellSafe-Inferred

Data.Functor.Constant

Description

The constant functor.

Synopsis

Documentation

newtype Constant a b Source

Constant functor.

Constructors

Constant 

Fields

getConstant :: a
 

Instances

Functor (Constant a) 
Monoid a => Applicative (Constant a) 
Foldable (Constant a) 
Traversable (Constant a) 
Show a => Show1 (Constant a) 
Read a => Read1 (Constant a) 
Ord a => Ord1 (Constant a) 
Eq a => Eq1 (Constant a) 
Eq a => Eq (Constant a b) 
Ord a => Ord (Constant a b) 
Read a => Read (Constant a b) 
Show a => Show (Constant a b)