Copyright	(C) 2011-2015 Edward Kmett
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	provisional
Portability	portable
Safe Haskell	Trustworthy
Language	Haskell2010

Data.Stream.Future

Description

Synopsis

data Future a
- = Last a
- | a :< (Future a)
tail :: Future a -> Maybe (Future a)
length :: Foldable t => t a -> Int
index :: Int -> Future a -> a

Documentation

data Future a Source #

Constructors

Last a
a :< (Future a) infixr 5

Instances

Instances details

Foldable Future Source #
Instance details Defined in Data.Stream.Future Methods fold :: Monoid m => Future m -> m # foldMap :: Monoid m => (a -> m) -> Future a -> m # foldMap' :: Monoid m => (a -> m) -> Future a -> m # foldr :: (a -> b -> b) -> b -> Future a -> b # foldr' :: (a -> b -> b) -> b -> Future a -> b # foldl :: (b -> a -> b) -> b -> Future a -> b # foldl' :: (b -> a -> b) -> b -> Future a -> b # foldr1 :: (a -> a -> a) -> Future a -> a # foldl1 :: (a -> a -> a) -> Future a -> a # toList :: Future a -> [a] # null :: Future a -> Bool # length :: Future a -> Int # elem :: Eq a => a -> Future a -> Bool # maximum :: Ord a => Future a -> a # minimum :: Ord a => Future a -> a # sum :: Num a => Future a -> a # product :: Num a => Future a -> a #
Traversable Future Source #
Instance details Defined in Data.Stream.Future Methods traverse :: Applicative f => (a -> f b) -> Future a -> f (Future b) # sequenceA :: Applicative f => Future (f a) -> f (Future a) # mapM :: Monad m => (a -> m b) -> Future a -> m (Future b) # sequence :: Monad m => Future (m a) -> m (Future a) #
Applicative Future Source #
Instance details Defined in Data.Stream.Future Methods pure :: a -> Future a # (<>) :: Future (a -> b) -> Future a -> Future b # liftA2 :: (a -> b -> c) -> Future a -> Future b -> Future c # (>) :: Future a -> Future b -> Future b # (<*) :: Future a -> Future b -> Future a #
Functor Future Source #
Instance details Defined in Data.Stream.Future Methods fmap :: (a -> b) -> Future a -> Future b # (<$) :: a -> Future b -> Future a #
Comonad Future Source #
Instance details Defined in Data.Stream.Future Methods extract :: Future a -> a # duplicate :: Future a -> Future (Future a) # extend :: (Future a -> b) -> Future a -> Future b #
ComonadApply Future Source #
Instance details Defined in Data.Stream.Future Methods (<@>) :: Future (a -> b) -> Future a -> Future b # (@>) :: Future a -> Future b -> Future b # (<@) :: Future a -> Future b -> Future a #
Foldable1 Future Source #
Instance details Defined in Data.Stream.Future Methods fold1 :: Semigroup m => Future m -> m # foldMap1 :: Semigroup m => (a -> m) -> Future a -> m # foldMap1' :: Semigroup m => (a -> m) -> Future a -> m # toNonEmpty :: Future a -> NonEmpty a # maximum :: Ord a => Future a -> a # minimum :: Ord a => Future a -> a # head :: Future a -> a # last :: Future a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Future a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Future a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Future a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Future a -> b #
Alt Future Source #
Instance details Defined in Data.Stream.Future Methods (<!>) :: Future a -> Future a -> Future a # some :: Applicative Future => Future a -> Future [a] # many :: Applicative Future => Future a -> Future [a] #
Apply Future Source #
Instance details Defined in Data.Stream.Future Methods (<.>) :: Future (a -> b) -> Future a -> Future b # (.>) :: Future a -> Future b -> Future b # (<.) :: Future a -> Future b -> Future a # liftF2 :: (a -> b -> c) -> Future a -> Future b -> Future c #
Extend Future Source #
Instance details Defined in Data.Stream.Future Methods duplicated :: Future a -> Future (Future a) # extended :: (Future a -> b) -> Future a -> Future b #
Traversable1 Future Source #
Instance details Defined in Data.Stream.Future Methods traverse1 :: Apply f => (a -> f b) -> Future a -> f (Future b) # sequence1 :: Apply f => Future (f b) -> f (Future b) #
Data a => Data (Future a) Source #
Instance details Defined in Data.Stream.Future Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Future a -> c (Future a) # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Future a) # toConstr :: Future a -> Constr # dataTypeOf :: Future a -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Future a)) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Future a)) # gmapT :: (forall b. Data b => b -> b) -> Future a -> Future a # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Future a -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Future a -> r # gmapQ :: (forall d. Data d => d -> u) -> Future a -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> Future a -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Future a -> m (Future a) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Future a -> m (Future a) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Future a -> m (Future a) #
Semigroup (Future a) Source #
Instance details Defined in Data.Stream.Future Methods (<>) :: Future a -> Future a -> Future a # sconcat :: NonEmpty (Future a) -> Future a # stimes :: Integral b => b -> Future a -> Future a #
IsList (Future a) Source #
Instance details Defined in Data.Stream.Future Associated Types type Item (Future a) # Methods fromList :: [Item (Future a)] -> Future a # fromListN :: Int -> [Item (Future a)] -> Future a # toList :: Future a -> [Item (Future a)] #
Read a => Read (Future a) Source #
Instance details Defined in Data.Stream.Future Methods readsPrec :: Int -> ReadS (Future a) # readList :: ReadS [Future a] # readPrec :: ReadPrec (Future a) # readListPrec :: ReadPrec [Future a] #
Show a => Show (Future a) Source #
Instance details Defined in Data.Stream.Future Methods showsPrec :: Int -> Future a -> ShowS # show :: Future a -> String # showList :: [Future a] -> ShowS #
Eq a => Eq (Future a) Source #
Instance details Defined in Data.Stream.Future Methods (==) :: Future a -> Future a -> Bool # (/=) :: Future a -> Future a -> Bool #
Ord a => Ord (Future a) Source #
Instance details Defined in Data.Stream.Future Methods compare :: Future a -> Future a -> Ordering # (<) :: Future a -> Future a -> Bool # (<=) :: Future a -> Future a -> Bool # (>) :: Future a -> Future a -> Bool # (>=) :: Future a -> Future a -> Bool # max :: Future a -> Future a -> Future a # min :: Future a -> Future a -> Future a #
type Item (Future a) Source #
Instance details Defined in Data.Stream.Future type Item (Future a) = a

tail :: Future a -> Maybe (Future a) Source #

length :: Foldable t => t a -> Int #

Returns the size/length of a finite structure as an Int. The default implementation just counts elements starting with the leftmost. Instances for structures that can compute the element count faster than via element-by-element counting, should provide a specialised implementation.

Examples

Expand

Basic usage:

>>> length []
0

>>> length ['a', 'b', 'c']
3
>>> length [1..]
* Hangs forever *

Since: base-4.8.0.0

index :: Int -> Future a -> a Source #