ghc-6.10.2: The GHC API Contents Index

UniqSupply

Contents Main data type Operations on supplies Unique supply monad and its abstraction Operations on the monad Deprecated operations on UniqSM

Synopsis

data UniqSupply uniqFromSupply :: UniqSupply -> Unique uniqsFromSupply :: UniqSupply -> [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 lazyThenUs :: UniqSM a -> (a -> UniqSM b) -> UniqSM b lazyMapUs :: (a -> UniqSM b) -> [a] -> UniqSM [b] getUniqueUs :: UniqSM Unique getUs :: UniqSM UniqSupply returnUs :: a -> UniqSM a thenUs :: UniqSM a -> (a -> UniqSM b) -> UniqSM b mapUs :: (a -> UniqSM b) -> [a] -> UniqSM [b]

Main data type

data UniqSupply

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

Obtain the Unique from this particular UniqSupply

uniqsFromSupply :: UniqSupply -> [Unique]

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

mkSplitUniqSupply :: Char -> IO UniqSupply

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)

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

listSplitUniqSupply :: UniqSupply -> [UniqSupply]

Create an infinite list of UniqSupply from a single one

Unique supply monad and its abstraction

data UniqSM result

A monad which just gives the ability to obtain Uniques Instances Monad UniqSM Functor UniqSM MonadFix UniqSM Applicative UniqSM MonadUnique UniqSM

class Monad m => MonadUnique m where

A monad for generating unique identifiers Methods getUniqueSupplyM :: m UniqSupply Get a new UniqueSupply getUniqueM :: m Unique Get a new unique identifier getUniquesM :: m [Unique] Get an infinite list of new unique identifiers Instances MonadUnique UniqSM MonadUnique FuelMonad MonadUnique SimplM MonadUnique (IOEnv (Env gbl lcl)) MonadUnique (DFM' FuelMonad f)

Operations on the monad

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

Run the UniqSM action, returning the final UniqSupply

initUs_ :: UniqSupply -> UniqSM a -> a

Run the UniqSM action, discarding the final UniqSupply

lazyThenUs :: UniqSM a -> (a -> UniqSM b) -> UniqSM b

lazyMapUs :: (a -> UniqSM b) -> [a] -> UniqSM [b]

Deprecated operations on UniqSM

getUniqueUs :: UniqSM Unique

getUs :: UniqSM UniqSupply

returnUs :: a -> UniqSM a

thenUs :: UniqSM a -> (a -> UniqSM b) -> UniqSM b

mapUs :: (a -> UniqSM b) -> [a] -> UniqSM [b]

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