Safe Haskell	None
Language	Haskell2010

UniqSupply

Contents

Main data type
- Operations on supplies
Unique supply monad and its abstraction
- Operations on the monad
Set supply strategy

Synopsis

data UniqSupply
uniqFromSupply :: UniqSupply -> Unique
uniqsFromSupply :: UniqSupply -> [Unique]
takeUniqFromSupply :: UniqSupply -> (Unique, UniqSupply)
uniqFromMask :: Char -> IO Unique
mkSplitUniqSupply :: Char -> IO UniqSupply
splitUniqSupply :: UniqSupply -> (UniqSupply, UniqSupply)
listSplitUniqSupply :: UniqSupply -> [UniqSupply]
data UniqSM result
class Monad m => MonadUnique m where
- getUniqueSupplyM :: m UniqSupply
- getUniqueM :: m Unique
- getUniquesM :: m [Unique]
initUs :: UniqSupply -> UniqSM a -> (a, UniqSupply)
initUs_ :: UniqSupply -> UniqSM a -> a
initUniqSupply :: Int -> Int -> IO ()

Main data type

data UniqSupply Source #

Unique Supply

A value of type UniqSupply is unique, and it can supply one distinct Unique. Also, from the supply, one can also manufacture an arbitrary number of further UniqueSupply values, which will be distinct from the first and from all others.

Operations on supplies

uniqFromSupply :: UniqSupply -> Unique Source #

Obtain the Unique from this particular UniqSupply

uniqsFromSupply :: UniqSupply -> [Unique] Source #

Obtain an infinite list of Unique that can be generated by constant splitting of the supply

takeUniqFromSupply :: UniqSupply -> (Unique, UniqSupply) Source #

Obtain the Unique from this particular UniqSupply, and a new supply

uniqFromMask :: Char -> IO Unique Source #

mkSplitUniqSupply :: Char -> IO UniqSupply Source #

Create a unique supply out of thin air. The character given must be distinct from those of all calls to this function in the compiler for the values generated to be truly unique.

splitUniqSupply :: UniqSupply -> (UniqSupply, UniqSupply) Source #

Build two UniqSupply from a single one, each of which can supply its own Unique.

listSplitUniqSupply :: UniqSupply -> [UniqSupply] Source #

Create an infinite list of UniqSupply from a single one

Unique supply monad and its abstraction

data UniqSM result Source #

A monad which just gives the ability to obtain Uniques

Instances

Monad UniqSM Source #
Instance details Defined in UniqSupply Methods (>>=) :: UniqSM a -> (a -> UniqSM b) -> UniqSM b # (>>) :: UniqSM a -> UniqSM b -> UniqSM b # return :: a -> UniqSM a # fail :: String -> UniqSM a #
Functor UniqSM Source #
Instance details Defined in UniqSupply Methods fmap :: (a -> b) -> UniqSM a -> UniqSM b # (<$) :: a -> UniqSM b -> UniqSM a #
MonadFix UniqSM Source #
Instance details Defined in UniqSupply Methods mfix :: (a -> UniqSM a) -> UniqSM a #
MonadFail UniqSM Source #
Instance details Defined in UniqSupply Methods fail :: String -> UniqSM a #
Applicative UniqSM Source #
Instance details Defined in UniqSupply Methods pure :: a -> UniqSM a # (<>) :: UniqSM (a -> b) -> UniqSM a -> UniqSM b # liftA2 :: (a -> b -> c) -> UniqSM a -> UniqSM b -> UniqSM c # (>) :: UniqSM a -> UniqSM b -> UniqSM b # (<*) :: UniqSM a -> UniqSM b -> UniqSM a #
MonadUnique UniqSM Source #
Instance details Defined in UniqSupply Methods getUniqueSupplyM :: UniqSM UniqSupply Source # getUniqueM :: UniqSM Unique Source # getUniquesM :: UniqSM [Unique] Source #

class Monad m => MonadUnique m where Source #

A monad for generating unique identifiers

Minimal complete definition

getUniqueSupplyM

Methods

getUniqueSupplyM :: m UniqSupply Source #

Get a new UniqueSupply

getUniqueM :: m Unique Source #

Get a new unique identifier

getUniquesM :: m [Unique] Source #

Get an infinite list of new unique identifiers

Instances

MonadUnique UniqSM Source #
Instance details Defined in UniqSupply Methods getUniqueSupplyM :: UniqSM UniqSupply Source # getUniqueM :: UniqSM Unique Source # getUniquesM :: UniqSM [Unique] Source #
MonadUnique CoreM Source #
Instance details Defined in CoreMonad Methods getUniqueSupplyM :: CoreM UniqSupply Source # getUniqueM :: CoreM Unique Source # getUniquesM :: CoreM [Unique] Source #

Operations on the monad

initUs :: UniqSupply -> UniqSM a -> (a, UniqSupply) Source #

Run the UniqSM action, returning the final UniqSupply

initUs_ :: UniqSupply -> UniqSM a -> a Source #

Run the UniqSM action, discarding the final UniqSupply

Set supply strategy

initUniqSupply :: Int -> Int -> IO () Source #