Data.Vec.DataFamily.SpineStrict.Optics

Indexing

ix :: forall n a. SNatI n => Fin n -> Lens' (Vec n a) a

Index lens.

>>> view (ix (FS FZ)) ('a' ::: 'b' ::: 'c' ::: VNil)
'b'

>>> set (ix (FS FZ)) 'x' ('a' ::: 'b' ::: 'c' ::: VNil)
'a' ::: 'x' ::: 'c' ::: VNil

_Cons :: Iso (Vec ('S n) a) (Vec ('S n) b) (a, Vec n a) (b, Vec n b)

Match on non-empty Vec.

Note: lens _Cons is a Prism. In fact, Vec n a cannot have an instance of Cons as types don't match.

_head :: Lens' (Vec ('S n) a) a

Head lens. Note: lens _head is a Traversal'.

>>> view _head ('a' ::: 'b' ::: 'c' ::: VNil)
'a'

>>> set _head 'x' ('a' ::: 'b' ::: 'c' ::: VNil)
'x' ::: 'b' ::: 'c' ::: VNil

_tail :: Lens' (Vec ('S n) a) (Vec n a)

Tail lens.

Conversions

_Pull :: SNatI n => Iso (Vec n a) (Vec n b) (Vec n a) (Vec n b)

An Iso from toPull and fromPull.

_Vec :: SNatI n => Prism' [a] (Vec n a)

Prism from list.

>>> preview _Vec "foo" :: Maybe (Vec N.Nat3 Char)
Just ('f' ::: 'o' ::: 'o' ::: VNil)

>>> preview _Vec "foo" :: Maybe (Vec N.Nat2 Char)
Nothing

>>> review _Vec (True ::: False ::: VNil)
[True,False]

Orphan instances

SNatI n => Each (Fin n) (Vec n a) (Vec n b) a b

Methods

each :: IxTraversal (Fin n) (Vec n a) (Vec n b) a b

SNatI n => Ixed (Vec n a)

Vec doesn't have At instance, as we cannot remove value from Vec. See ix in Data.Vec.DataFamily.SpineStrict module for an Lens (not Traversal).

Associated Types

type IxKind (Vec n a)

Methods

ix :: Index (Vec n a) -> Optic' (IxKind (Vec n a)) NoIx (Vec n a) (IxValue (Vec n a))

Field1 (Vec ('S n) a) (Vec ('S n) a) a a

Methods

_1 :: Lens (Vec ('S n) a) (Vec ('S n) a) a a

Field2 (Vec ('S ('S n)) a) (Vec ('S ('S n)) a) a a

Methods

_2 :: Lens (Vec ('S ('S n)) a) (Vec ('S ('S n)) a) a a

Field3 (Vec ('S ('S ('S n))) a) (Vec ('S ('S ('S n))) a) a a

Methods

_3 :: Lens (Vec ('S ('S ('S n))) a) (Vec ('S ('S ('S n))) a) a a

Field4 (Vec ('S ('S ('S ('S n)))) a) (Vec ('S ('S ('S ('S n)))) a) a a

Methods

_4 :: Lens (Vec ('S ('S ('S ('S n)))) a) (Vec ('S ('S ('S ('S n)))) a) a a

Field5 (Vec ('S ('S ('S ('S ('S n))))) a) (Vec ('S ('S ('S ('S ('S n))))) a) a a

Methods

_5 :: Lens (Vec ('S ('S ('S ('S ('S n))))) a) (Vec ('S ('S ('S ('S ('S n))))) a) a a

Field6 (Vec ('S ('S ('S ('S ('S ('S n)))))) a) (Vec ('S ('S ('S ('S ('S ('S n)))))) a) a a

Methods

_6 :: Lens (Vec ('S ('S ('S ('S ('S ('S n)))))) a) (Vec ('S ('S ('S ('S ('S ('S n)))))) a) a a

Field7 (Vec ('S ('S ('S ('S ('S ('S ('S n))))))) a) (Vec ('S ('S ('S ('S ('S ('S ('S n))))))) a) a a

Methods

_7 :: Lens (Vec ('S ('S ('S ('S ('S ('S ('S n))))))) a) (Vec ('S ('S ('S ('S ('S ('S ('S n))))))) a) a a

Field8 (Vec ('S ('S ('S ('S ('S ('S ('S ('S n)))))))) a) (Vec ('S ('S ('S ('S ('S ('S ('S ('S n)))))))) a) a a

Methods

_8 :: Lens (Vec ('S ('S ('S ('S ('S ('S ('S ('S n)))))))) a) (Vec ('S ('S ('S ('S ('S ('S ('S ('S n)))))))) a) a a

Field9 (Vec ('S ('S ('S ('S ('S ('S ('S ('S ('S n))))))))) a) (Vec ('S ('S ('S ('S ('S ('S ('S ('S ('S n))))))))) a) a a

Methods

_9 :: Lens (Vec ('S ('S ('S ('S ('S ('S ('S ('S ('S n))))))))) a) (Vec ('S ('S ('S ('S ('S ('S ('S ('S ('S n))))))))) a) a a