Safe Haskell	Safe
Language	Haskell2010

Data.IndexedListLiterals

Synopsis

class IndexedListLiterals (input :: Type) (length :: Nat) (output :: Type) | output length -> input, input -> output length where
type ILL = IndexedListLiterals
module Data.Tuple.Only
data ZeroTuple a = ZeroTuple
len :: Proxy a
fromList :: forall input (length :: Nat) output. (KnownNat length, ILL input length output) => [output] -> Maybe input
fromListP :: forall input (length :: Nat) output len. (KnownNat length, ILL input length output) => len length -> [output] -> Maybe input

Documentation

class IndexedListLiterals (input :: Type) (length :: Nat) (output :: Type) | output length -> input, input -> output length where Source #

A type class which allows you to write tuples which can be transformed to and from a list the length of the list is also provided as a Nat

Minimal complete definition

toList, fromList'

Methods

toList :: input -> [output] Source #

> toList (Only 1)
  [1]

> toList (1,2,3)
  [1,2,3]

> toList ZeroTuple
  []

fromList' :: [output] -> input Source #

a partial fromList with bad error messages

Instances

IndexedListLiterals (Only a) 1 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: Only a -> [a] Source # fromList' :: [a] -> Only a Source #
IndexedListLiterals (a, a) 2 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a) -> [a] Source # fromList' :: [a] -> (a, a) Source #
IndexedListLiterals (ZeroTuple a) 0 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: ZeroTuple a -> [a] Source # fromList' :: [a] -> ZeroTuple a Source #
IndexedListLiterals (a, a, a) 3 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a) Source #
IndexedListLiterals (a, a, a, a) 4 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a) 5 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a) 6 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a) 7 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a) 8 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a) 9 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a) 10 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a, a) 11 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a, a, a) 12 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a, a, a, a) 13 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a, a, a, a, a) 14 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) 15 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) 16 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) 17 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) 18 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) 19 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) Source #
IndexedListLiterals (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) 20 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) -> [a] Source # fromList' :: [a] -> (a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a) Source #

type ILL = IndexedListLiterals Source #

An alias for IndexedListLiterals

module Data.Tuple.Only

data ZeroTuple a Source #

Intuitively the zero tuple is () or Void but this breaks the Functional Dependency "input -> output length" stopping reliable inference, so this constructor is used to preserve type information

Constructors

ZeroTuple

Instances

IndexedListLiterals (ZeroTuple a) 0 a Source #
Instance details Defined in Data.IndexedListLiterals Methods toList :: ZeroTuple a -> [a] Source # fromList' :: [a] -> ZeroTuple a Source #

len :: Proxy a Source #

fromList :: forall input (length :: Nat) output. (KnownNat length, ILL input length output) => [output] -> Maybe input Source #

> fromList [1,2,3] :: Maybe (Int, Int, Int)
  Just (1,2,3)

> fromList ["word","up"] :: Maybe (String, String, String)
  Nothing

> fromList ['z'] :: Maybe (Only Char)
  Just (Only 'z')

fromListP :: forall input (length :: Nat) output len. (KnownNat length, ILL input length output) => len length -> [output] -> Maybe input Source #

the fromList variants take a list and convert it into a tuple it's sort of the inverse of toList

> fromListP (len @3) [1,2,3]
  Just (1,2,3)

> fromListP (len @3) ["word","up"]
  Nothing

> fromListP (len @1) ['z']
  Just (Only 'z') @