Copyright	(C) 2012-2015 Edward Kmett
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	provisional
Portability	non-portable
Safe Haskell	Safe-Inferred
Language	Haskell98

Control.Lens.Internal.Getter

Description

Synopsis

Documentation

A Functor you can coerce ignores its argument, which it carries solely as a phantom type parameter.

By the Functor and Contravariant laws, an instance of both will necessarily satisfy:

id = fmap f = coerce = contramap g

The mempty equivalent for a Contravariant Applicative Functor.

Constructors

AlongsideLeft
Fields getAlongsideLeft :: f (a, b)

Instances

Traversable f => Bitraversable (AlongsideLeft f)
Functor f => Bifunctor (AlongsideLeft f)
Foldable f => Bifoldable (AlongsideLeft f)
Functor f => Functor (AlongsideLeft f b)
Foldable f => Foldable (AlongsideLeft f b)
Traversable f => Traversable (AlongsideLeft f b)
Contravariant f => Contravariant (AlongsideLeft f b)
Foldable1 f => Foldable1 (AlongsideLeft f b)
Traversable1 f => Traversable1 (AlongsideLeft f b)
Read (f (a, b)) => Read (AlongsideLeft f b a)
Show (f (a, b)) => Show (AlongsideLeft f b a)

Constructors

AlongsideRight
Fields getAlongsideRight :: f (a, b)

Instances

Traversable f => Bitraversable (AlongsideRight f)
Functor f => Bifunctor (AlongsideRight f)
Foldable f => Bifoldable (AlongsideRight f)
Functor f => Functor (AlongsideRight f a)
Foldable f => Foldable (AlongsideRight f a)
Traversable f => Traversable (AlongsideRight f a)
Contravariant f => Contravariant (AlongsideRight f a)
Foldable1 f => Foldable1 (AlongsideRight f a)
Traversable1 f => Traversable1 (AlongsideRight f a)
Read (f (a, b)) => Read (AlongsideRight f a b)
Show (f (a, b)) => Show (AlongsideRight f a b)