optics-core-0.4.1.1: Optics as an abstract interface: core definitions
Safe HaskellSafe-Inferred
LanguageHaskell2010

Optics.IxAffineFold

Description

An IxAffineFold is an indexed version of an AffineFold. See the "Indexed optics" section of the overview documentation in the Optics module of the main optics package for more details on indexed optics.

Synopsis

Formation

type IxAffineFold i s a = Optic' An_AffineFold (WithIx i) s a Source #

Type synonym for an indexed affine fold.

Introduction

iafolding :: (s -> Maybe (i, a)) -> IxAffineFold i s a Source #

Create an IxAffineFold from a partial function.

Elimination

ipreview :: (Is k An_AffineFold, is `HasSingleIndex` i) => Optic' k is s a -> s -> Maybe (i, a) Source #

Retrieve the value along with its index targeted by an IxAffineFold.

ipreviews :: (Is k An_AffineFold, is `HasSingleIndex` i) => Optic' k is s a -> (i -> a -> r) -> s -> Maybe r Source #

Retrieve a function of the value and its index targeted by an IxAffineFold.

Computation

ipreview (iafolding f) ≡ f

Additional introduction forms

iafoldVL :: (forall f. Functor f => (forall r. r -> f r) -> (i -> a -> f u) -> s -> f v) -> IxAffineFold i s a Source #

Obtain an IxAffineFold by lifting itraverse_ like function.

aifoldVL . iatraverseOf_id
aitraverseOf_ . iafoldVLid

Since: 0.3

Additional elimination forms

iatraverseOf_ :: (Is k An_AffineFold, Functor f, is `HasSingleIndex` i) => Optic' k is s a -> (forall r. r -> f r) -> (i -> a -> f u) -> s -> f () Source #

Traverse over the target of an IxAffineFold, computing a Functor-based answer, but unlike iatraverseOf do not construct a new structure.

Since: 0.3

Combinators

filteredBy :: Is k An_AffineFold => Optic' k is a i -> IxAffineFold i a a Source #

Obtain a potentially empty IxAffineFold by taking the element from another AffineFold and using it as an index.

Since: 0.3

Monoid structure

IxAffineFold admits a monoid structure where iafailing combines folds (returning a result from the second fold only if the first returns none) and the identity element is ignored (which returns no results).

Note: There is no isumming equivalent that returns an IxAffineFold, because it would not need to return more than one result.

There is no Semigroup or Monoid instance for IxAffineFold, because there is not a unique choice of monoid to use that works for all optics, and the (<>) operator could not be used to combine optics of different kinds.

iafailing :: (Is k An_AffineFold, Is l An_AffineFold, is1 `HasSingleIndex` i, is2 `HasSingleIndex` i) => Optic' k is1 s a -> Optic' l is2 s a -> IxAffineFold i s a infixl 3 Source #

Try the first IxAffineFold. If it returns no entry, try the second one.

Subtyping

data An_AffineFold :: OpticKind Source #

Tag for an affine fold.

Instances

Instances details
Is A_Getter An_AffineFold Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

implies :: forall (p :: Type -> Type -> Type -> Type) r. (Constraints A_Getter p => r) -> Constraints An_AffineFold p => r Source #

Is A_Lens An_AffineFold Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

implies :: forall (p :: Type -> Type -> Type -> Type) r. (Constraints A_Lens p => r) -> Constraints An_AffineFold p => r Source #

Is A_Prism An_AffineFold Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

implies :: forall (p :: Type -> Type -> Type -> Type) r. (Constraints A_Prism p => r) -> Constraints An_AffineFold p => r Source #

Is A_ReversedPrism An_AffineFold Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

implies :: forall (p :: Type -> Type -> Type -> Type) r. (Constraints A_ReversedPrism p => r) -> Constraints An_AffineFold p => r Source #

Is An_AffineFold A_Fold Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

implies :: forall (p :: Type -> Type -> Type -> Type) r. (Constraints An_AffineFold p => r) -> Constraints A_Fold p => r Source #

Is An_AffineTraversal An_AffineFold Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

implies :: forall (p :: Type -> Type -> Type -> Type) r. (Constraints An_AffineTraversal p => r) -> Constraints An_AffineFold p => r Source #

Is An_Iso An_AffineFold Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

implies :: forall (p :: Type -> Type -> Type -> Type) r. (Constraints An_Iso p => r) -> Constraints An_AffineFold p => r Source #

k ~ A_Fold => JoinKinds A_Fold An_AffineFold k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints A_Fold p, Constraints An_AffineFold p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds A_Getter An_AffineFold k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints A_Getter p, Constraints An_AffineFold p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds A_Lens An_AffineFold k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints A_Lens p, Constraints An_AffineFold p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds A_Prism An_AffineFold k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints A_Prism p, Constraints An_AffineFold p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds A_ReversedPrism An_AffineFold k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints A_ReversedPrism p, Constraints An_AffineFold p) => r) -> Constraints k p => r Source #

k ~ A_Fold => JoinKinds A_Traversal An_AffineFold k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints A_Traversal p, Constraints An_AffineFold p) => r) -> Constraints k p => r Source #

k ~ A_Fold => JoinKinds An_AffineFold A_Fold k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_AffineFold p, Constraints A_Fold p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds An_AffineFold A_Getter k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_AffineFold p, Constraints A_Getter p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds An_AffineFold A_Lens k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_AffineFold p, Constraints A_Lens p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds An_AffineFold A_Prism k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_AffineFold p, Constraints A_Prism p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds An_AffineFold A_ReversedPrism k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_AffineFold p, Constraints A_ReversedPrism p) => r) -> Constraints k p => r Source #

k ~ A_Fold => JoinKinds An_AffineFold A_Traversal k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_AffineFold p, Constraints A_Traversal p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds An_AffineFold An_AffineFold k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_AffineFold p, Constraints An_AffineFold p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds An_AffineFold An_AffineTraversal k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_AffineFold p, Constraints An_AffineTraversal p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds An_AffineFold An_Iso k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_AffineFold p, Constraints An_Iso p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds An_AffineTraversal An_AffineFold k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_AffineTraversal p, Constraints An_AffineFold p) => r) -> Constraints k p => r Source #

k ~ An_AffineFold => JoinKinds An_Iso An_AffineFold k Source # 
Instance details

Defined in Optics.Internal.Optic.Subtyping

Methods

joinKinds :: forall (p :: Type -> Type -> Type -> Type) r. ((Constraints An_Iso p, Constraints An_AffineFold p) => r) -> Constraints k p => r Source #

(s ~ t, a ~ b) => IxOptic An_AffineFold s t a b Source # 
Instance details

Defined in Optics.Indexed.Core

Methods

noIx :: forall (is :: IxList). NonEmptyIndices is => Optic An_AffineFold is s t a b -> Optic An_AffineFold NoIx s t a b Source #

(s ~ t, a ~ b) => ToReadOnly An_AffineFold s t a b Source # 
Instance details

Defined in Optics.ReadOnly

Associated Types

type ReadOnlyOptic An_AffineFold Source #

Methods

getting :: forall (is :: IxList). Optic An_AffineFold is s t a b -> Optic' (ReadOnlyOptic An_AffineFold) is s a Source #

type ReadOnlyOptic An_AffineFold Source # 
Instance details

Defined in Optics.ReadOnly