Data.Vector.HFixed

Heterogeneous vectors.

HVector type classes

class Arity (Len xs) => Arity xs

Type class for dealing with N-ary function in generic way. Both accum and apply work with accumulator data types which are polymorphic. So it's only possible to write functions which rearrange elements in vector using plain ADT. It's possible to get around it by using GADT as accumulator (See ArityC and function which use it)

This is also somewhat a kitchen sink module. It contains witnesses which could be used to prove type equalities or to bring instance in scope.

Instances

Arity ([] *)

Arity xs => Arity (: * x xs)

class Arity xs => ArityC c xs

Declares that every type in list satisfy constraint c

Instances

ArityC c ([] *)

(c x, ArityC c xs) => ArityC c (: * x xs)

class Arity (Elems v) => HVector v where

Type class for heterogeneous vectors. Instance should specify way to construct and deconstruct itself

Note that this type class is extremely generic. Almost any single constructor data type could be made instance. It could be monomorphic, it could be polymorphic in some or all fields it doesn't matter. Only law instance should obey is:

 inspect v construct = v

Default implementation which uses Generic is provided.

Associated Types

type Elems v :: [*]

Methods

construct :: Fun (Elems v) v

Function for constructing vector

inspect :: v -> Fun (Elems v) a -> a

Function for deconstruction of vector. It applies vector's elements to N-ary function.

Instances

HVector ()

Unit is empty heterogeneous vector

HVector (Complex a)

Arity xs => HVector (ContVec xs)

Arity xs => HVector (VecList xs)

Arity xs => HVector (HVec xs)

HVector (a, b)

(Storable a, HomArity n a) => HVector (Vec n a)

(Unbox n a, HomArity n a) => HVector (Vec n a)

(Prim a, HomArity n a) => HVector (Vec n a)

HomArity n a => HVector (Vec n a)

(Arity (Wrap * * f xs), Arity xs) => HVector (HVecF xs f)

It's not possible to remove constrain Arity (Wrap f xs) because it's required by superclass and we cannot prove it for all f. witWrapped allow to generate proofs for terms

HVector (a, b, c)

HVector (a, b, c, d)

HVector (a, b, c, d, e)

HVector (a, b, c, d, e, f)

HVector (a, b, c, d, e, f, g)

class Arity (ElemsF v) => HVectorF v where

Type class for partially homogeneous vector where every element in the vector have same type constructor. Vector itself is parametrized by that constructor

Associated Types

type ElemsF v :: [*]

Elements of the vector without type constructors

Methods

inspectF :: v f -> TFun f (ElemsF v) a -> a

constructF :: TFun f (ElemsF v) (v f)

Instances

Arity xs => HVectorF (VecListF xs)

Arity xs => HVectorF (HVecF xs)

Arity xs => HVectorF (ContVecF * xs)

type family Wrap f a :: [β]

Wrap every element of list into type constructor

data Proxy a

Constructors

Proxy

Position based functions

convert :: (HVector v, HVector w, Elems v ~ Elems w) => v -> w

We can convert between any two vector which have same structure but different representations.

head :: (HVector v, Elems v ~ (a : as), Arity as) => v -> a

Head of the vector

tail :: (HVector v, HVector w, (a : Elems w) ~ Elems v) => v -> w

Tail of the vector

>>> case tail ('a',"aa",()) of x@(_,_) -> x
("aa",())

cons :: (HVector v, HVector w, Elems w ~ (a : Elems v)) => a -> v -> w

Prepend element to the list. Note that it changes type of vector so it either must be known from context of specified explicitly

concat :: (HVector v, HVector u, HVector w, Elems w ~ (Elems v ++ Elems u)) => v -> u -> w

Concatenate two vectors

Indexing

class Arity n => Index n xs

Indexing of vectors

Associated Types

type ValueAt n xs :: *

Type at position n

Instances

Arity xs => Index Z (: * x xs)

Index n xs => Index (S n) (: * x xs)

index :: (Index n (Elems v), HVector v) => v -> n -> ValueAt n (Elems v)

Index heterogeneous vector

set :: (Index n (Elems v), HVector v) => n -> ValueAt n (Elems v) -> v -> v

Set element in the vector

element :: (Index n (Elems v), ValueAt n (Elems v) ~ a, HVector v, Functor f) => n -> (a -> f a) -> v -> f v

Twan van Laarhoven's lens for i'th element.

elementCh :: (Index n (Elems v), a ~ ValueAt n (Elems v), HVector v, HVector w, Elems w ~ NewElems n (Elems v) b, Functor f) => n -> (a -> f b) -> v -> f w

Type changing Twan van Laarhoven's lens for i'th element.

Generic constructors

mk0 :: (HVector v, Elems v ~ `[]`) => v

mk1 :: (HVector v, Elems v ~ `[a]`) => a -> v

mk2 :: (HVector v, Elems v ~ `[a, b]`) => a -> b -> v

mk3 :: (HVector v, Elems v ~ `[a, b, c]`) => a -> b -> c -> v

mk4 :: (HVector v, Elems v ~ `[a, b, c, d]`) => a -> b -> c -> d -> v

mk5 :: (HVector v, Elems v ~ `[a, b, c, d, e]`) => a -> b -> c -> d -> e -> v

Folds and unfolds

fold :: HVector v => v -> Fn (Elems v) r -> r

Most generic form of fold which doesn't constrain elements id use of inspect. Or in more convenient form below:

>>> fold (12::Int,"Str") (\a s -> show a ++ s)
"12Str"

foldr :: (HVector v, ArityC c (Elems v)) => Proxy c -> (forall a. c a => a -> b -> b) -> b -> v -> b

Right fold over heterogeneous vector

foldl :: (HVector v, ArityC c (Elems v)) => Proxy c -> (forall a. c a => b -> a -> b) -> b -> v -> b

Left fold over heterogeneous vector

mapM_ :: (HVector v, ArityC c (Elems v), Monad m) => Proxy c -> (forall a. c a => a -> m ()) -> v -> m ()

Apply monadic action to every element in the vector

unfoldr :: (HVector v, ArityC c (Elems v)) => Proxy c -> (forall a. c a => b -> (a, b)) -> b -> v

Unfold vector.

Polymorphic values

replicate :: (HVector v, ArityC c (Elems v)) => Proxy c -> (forall x. c x => x) -> v

Replicate polymorphic value n times. Concrete instance for every element is determined by their respective types.

>>> import Data.Vector.HFixed as H
>>> H.replicate (Proxy :: Proxy Monoid) mempty :: ((),String)
((),"")

replicateM :: (HVector v, Monad m, ArityC c (Elems v)) => Proxy c -> (forall x. c x => m x) -> m v

Replicate monadic action n times.

>>> import Data.Vector.HFixed as H
>>> H.replicateM (Proxy :: Proxy Read) (fmap read getLine) :: IO (Int,Char)
> 12
> 'a'
(12,'a')

zipMono :: (HVector v, ArityC c (Elems v)) => Proxy c -> (forall a. c a => a -> a -> a) -> v -> v -> v

Zip two heterogeneous vectors

zipMonoF :: (HVectorF v, ArityC c (ElemsF v)) => Proxy c -> (forall a. c a => f a -> f a -> f a) -> v f -> v f -> v f

Zip two heterogeneous vectors

zipFold :: (HVector v, ArityC c (Elems v), Monoid m) => Proxy c -> (forall a. c a => a -> a -> m) -> v -> v -> m

monomorphize :: (HVector v, ArityC c (Elems v)) => Proxy c -> (forall a. c a => a -> x) -> v -> ContVec (Len (Elems v)) x

Convert heterogeneous vector to homogeneous

monomorphizeF :: (HVectorF v, ArityC c (ElemsF v)) => Proxy c -> (forall a. c a => f a -> x) -> v f -> ContVec (Len (ElemsF v)) x

Convert heterogeneous vector to homogeneous

Vector parametrized with type constructor

mapFunctor :: HVectorF v => (forall a. f a -> g a) -> v f -> v g

sequence :: (Monad m, HVectorF v, HVector w, ElemsF v ~ Elems w) => v m -> m w

Sequence effects for every element in the vector

sequenceA :: (Applicative f, HVectorF v, HVector w, ElemsF v ~ Elems w) => v f -> f w

Sequence effects for every element in the vector

sequenceF :: (Monad m, HVectorF v) => v (m `Compose` f) -> m (v f)

Sequence effects for every element in the vector

sequenceAF :: (Applicative f, HVectorF v) => v (f `Compose` g) -> f (v g)

Sequence effects for every element in the vector

wrap :: (HVector v, HVectorF w, Elems v ~ ElemsF w) => (forall a. a -> f a) -> v -> w f

Wrap every value in the vector into type constructor.

unwrap :: (HVectorF v, HVector w, ElemsF v ~ Elems w) => (forall a. f a -> a) -> v f -> w

Unwrap every value in the vector from the type constructor.

distribute :: (Functor f, HVector v, HVectorF w, Elems v ~ ElemsF w) => f v -> w f

Analog of distribute from Distributive type class.

distributeF :: (Functor f, HVectorF v) => f (v g) -> v (f `Compose` g)

Analog of distribute from Distributive type class.

Specialized operations

eq :: (HVector v, ArityC Eq (Elems v)) => v -> v -> Bool

Generic equality for heterogeneous vectors

compare :: (HVector v, ArityC Ord (Elems v)) => v -> v -> Ordering

Generic comparison for heterogeneous vectors

rnf :: (HVector v, ArityC NFData (Elems v)) => v -> ()

Reduce vector to normal form