Safe Haskell | Safe |
---|---|

Language | Haskell98 |

## Synopsis

- data T f a = Cons {}
- (!:) :: a -> f a -> T f a
- force :: T f a -> T f a
- apply :: (Applicative f, Cons f, Append f) => T f (a -> b) -> T f a -> T f b
- bind :: (Monad f, Cons f, Append f) => T f a -> (a -> T f b) -> T f b
- toList :: Foldable f => T f a -> [a]
- flatten :: Cons f => T f a -> f a
- fetch :: ViewL f => f a -> Maybe (T f a)
- cons :: a -> f a -> T f a
- snoc :: Traversable f => f a -> a -> T f a
- singleton :: Empty f => a -> T f a
- reverse :: (Traversable f, Reverse f) => T f a -> T f a
- mapHead :: (a -> a) -> T f a -> T f a
- mapTail :: (f a -> g a) -> T f a -> T g a
- viewL :: T f a -> (a, f a)
- viewR :: Traversable f => T f a -> (f a, a)
- init :: Traversable f => T f a -> f a
- last :: Foldable f => T f a -> a
- foldl1 :: Foldable f => (a -> a -> a) -> T f a -> a
- foldl1Map :: Foldable f => (b -> b -> b) -> (a -> b) -> T f a -> b
- foldBalanced :: (a -> a -> a) -> T [] a -> a
- foldBalancedStrict :: (a -> a -> a) -> T [] a -> a
- maximum :: (Ord a, Foldable f) => T f a -> a
- maximumBy :: Foldable f => (a -> a -> Ordering) -> T f a -> a
- maximumKey :: (Ord b, Foldable f) => (a -> b) -> T f a -> a
- minimum :: (Ord a, Foldable f) => T f a -> a
- minimumBy :: Foldable f => (a -> a -> Ordering) -> T f a -> a
- minimumKey :: (Ord b, Foldable f) => (a -> b) -> T f a -> a
- sum :: (Num a, Foldable f) => T f a -> a
- product :: (Num a, Foldable f) => T f a -> a
- append :: (Append f, Traversable f) => T f a -> T f a -> T (T f) a
- appendLeft :: (Append f, Traversable f) => f a -> T f a -> T f a
- appendRight :: Append f => T f a -> f a -> T f a
- cycle :: (Cons f, Append f) => T f a -> T f a
- zipWith :: Zip f => (a -> b -> c) -> T f a -> T f b -> T f c
- mapAdjacent :: Traversable f => (a -> a -> b) -> T f a -> f b
- class Insert f where
- insertDefault :: (Ord a, InsertBy f, SortBy f) => a -> f a -> T f a
- class Insert f => InsertBy f where
- scanl :: Traversable f => (b -> a -> b) -> b -> f a -> T f b
- scanr :: Traversable f => (a -> b -> b) -> b -> f a -> T f b
- tails :: (Traversable f, Cons g, Empty g) => f a -> T f (g a)
- inits :: (Traversable f, Snoc g, Empty g) => f a -> T f (g a)
- initsRev :: (Traversable f, Cons g, Empty g, Reverse g) => f a -> T f (g a)
- removeEach :: Traversable f => T f a -> T f (a, f a)

# Documentation

The type `T`

can be used for many kinds of list-like structures
with restrictions on the size.

`T [] a`

is a lazy list containing at least one element.`T (T []) a`

is a lazy list containing at least two elements.`T Vector a`

is a vector with at least one element. You may also use unboxed vectors but the first element will be stored in a box and you will not be able to use many functions from this module.`T Maybe a`

is a list that contains one or two elements.`Maybe`

is isomorphic to`Optional Empty`

.`T Empty a`

is a list that contains exactly one element.`T (T Empty) a`

is a list that contains exactly two elements.`Optional (T Empty) a`

is a list that contains zero or two elements.- You can create a list type for every finite set of allowed list length
by nesting Optional and NonEmpty constructors.
If list length
`n`

is allowed, then place`Optional`

at depth`n`

, if it is disallowed then place`NonEmpty`

. The maximum length is marked by`Empty`

.

## Instances

(Monad f, Empty f, Cons f, Append f) => Monad (T f) Source # | |

Functor f => Functor (T f) Source # | |

(Applicative f, Empty f, Cons f, Append f) => Applicative (T f) Source # | |

Foldable f => Foldable (T f) Source # | |

Defined in Data.NonEmptyPrivate fold :: Monoid m => T f m -> m # foldMap :: Monoid m => (a -> m) -> T f a -> m # foldr :: (a -> b -> b) -> b -> T f a -> b # foldr' :: (a -> b -> b) -> b -> T f a -> b # foldl :: (b -> a -> b) -> b -> T f a -> b # foldl' :: (b -> a -> b) -> b -> T f a -> b # foldr1 :: (a -> a -> a) -> T f a -> a # foldl1 :: (a -> a -> a) -> T f a -> a # elem :: Eq a => a -> T f a -> Bool # maximum :: Ord a => T f a -> a # | |

Traversable f => Traversable (T f) Source # | |

NFData f => NFData (T f) Source # | |

Arbitrary f => Arbitrary (T f) Source # | |

Show f => Show (T f) Source # | |

(Traversable f, Reverse f) => Reverse (T f) Source # | |

(SortBy f, InsertBy f) => SortBy (T f) Source # | |

(Sort f, InsertBy f) => Sort (T f) Source # | If you nest too many non-empty lists then the efficient merge-sort (linear-logarithmic runtime) will degenerate to an inefficient insert-sort (quadratic runtime). |

Iterate f => Iterate (T f) Source # | |

Defined in Data.NonEmptyPrivate | |

Repeat f => Repeat (T f) Source # | |

Defined in Data.NonEmptyPrivate | |

Zip f => Zip (T f) Source # | |

(Cons f, Append f) => Append (T f) Source # | |

Empty f => Singleton (T f) Source # | |

Defined in Data.NonEmptyPrivate | |

ViewL f => ViewL (T f) Source # | Caution:
This instance mainly exist to allow cascaded applications of |

Snoc f => Snoc (T f) Source # | |

Cons f => Cons (T f) Source # | |

InsertBy f => InsertBy (T f) Source # | |

Insert f => Insert (T f) Source # | |

Choose f => Choose (T f) Source # | |

Defined in Data.NonEmpty.Mixed | |

(Eq a, Eq (f a)) => Eq (T f a) Source # | |

(Ord a, Ord (f a)) => Ord (T f a) Source # | |

(Show f, Show a) => Show (T f a) Source # | |

(Arbitrary a, Arbitrary f) => Arbitrary (T f a) Source # | |

(NFData f, NFData a) => NFData (T f a) Source # | |

Defined in Data.NonEmptyPrivate |

snoc :: Traversable f => f a -> a -> T f a Source #

viewR :: Traversable f => T f a -> (f a, a) Source #

init :: Traversable f => T f a -> f a Source #

foldBalanced :: (a -> a -> a) -> T [] a -> a Source #

Fold a non-empty list in a balanced way.
*Balanced* means that each element
has approximately the same depth in the operator tree.
*Approximately the same depth* means
that the difference between maximum and minimum depth is at most 1.
The accumulation operation must be associative and commutative
in order to get the same result as `foldl1`

or `foldr1`

.

foldBalancedStrict :: (a -> a -> a) -> T [] a -> a Source #

appendLeft :: (Append f, Traversable f) => f a -> T f a -> T f a infixr 5 Source #

cycle :: (Cons f, Append f) => T f a -> T f a Source #

generic variants:
`cycle`

or better `Semigroup.cycle`

mapAdjacent :: Traversable f => (a -> a -> b) -> T f a -> f b Source #

insert :: Ord a => a -> f a -> T f a Source #

Insert an element into an ordered list while preserving the order.

scanl :: Traversable f => (b -> a -> b) -> b -> f a -> T f b Source #

scanr :: Traversable f => (a -> b -> b) -> b -> f a -> T f b Source #

inits :: (Traversable f, Snoc g, Empty g) => f a -> T f (g a) Source #

Only advised for structures with efficient appending of single elements
like `Sequence`

.
Alternatively you may consider `initsRev`

.

removeEach :: Traversable f => T f a -> T f (a, f a) Source #