| Portability | GHC only |
|---|---|
| Maintainer | Simon Meier <iridcode@gmail.com> |
| Safe Haskell | None |
Control.Monad.Fresh
Description
Computations that need a fresh name supply.
- class (Applicative m, Monad m) => MonadFresh m where
- freshIdent :: String -> m Integer
- freshIdents :: Integer -> m Integer
- scopeFreshness :: m a -> m a
- type Fresh = FreshT Identity
- runFresh :: Fresh a -> FreshState -> (a, FreshState)
- evalFresh :: Fresh a -> FreshState -> a
- execFresh :: Fresh a -> FreshState -> FreshState
- newtype FreshT m a = FreshT {
- unFreshT :: StateT FreshState m a
- freshT :: (FreshState -> m (a, FreshState)) -> FreshT m a
- runFreshT :: FreshT m a -> FreshState -> m (a, FreshState)
- evalFreshT :: Monad m => FreshT m a -> FreshState -> m a
- execFreshT :: Monad m => FreshT m a -> FreshState -> m FreshState
- type FreshState = Integer
- nothingUsed :: FreshState
- module Control.Monad
- module Control.Monad.Fix
- module Control.Monad.Trans
MonadFresh class
class (Applicative m, Monad m) => MonadFresh m whereSource
Methods
Get the integer of the next fresh identifier of this name.
Get a number of fresh identifiers. This reserves the required number of identifiers on all names.
scopeFreshness :: m a -> m aSource
Scope the freshIdent and freshIdents requests such that these
variables are not marked as used once the scope is left.
Instances
| MonadFresh m => MonadFresh (MaybeT m) | |
| (Functor m, Monad m) => MonadFresh (FreshT m) | |
| (Functor m, Monad m) => MonadFresh (FreshT m) | |
| MonadFresh m => MonadFresh (ReaderT r m) | |
| MonadFresh m => MonadFresh (StateT s m) | |
| (Monoid w, MonadFresh m) => MonadFresh (WriterT w m) |
The Fresh monad
runFresh :: Fresh a -> FreshState -> (a, FreshState)Source
Run a computation with a fresh name supply.
evalFresh :: Fresh a -> FreshState -> aSource
Evaluate a computation with a fresh name supply.
execFresh :: Fresh a -> FreshState -> FreshStateSource
Execute a computation with a fresh name supply.
The fast FreshT monad transformer
A computation that can generate fresh variables from name hints.
Constructors
| FreshT | |
Fields
| |
Instances
| MonadTrans FreshT | |
| MonadBind k v m => MonadBind k v (FreshT m) | |
| MonadError e m => MonadError e (FreshT m) | |
| MonadReader r m => MonadReader r (FreshT m) | |
| MonadState s m => MonadState s (FreshT m) | |
| Monad m => Monad (FreshT m) | |
| Functor m => Functor (FreshT m) | |
| MonadPlus m => MonadPlus (FreshT m) | |
| (Monad m, Functor m) => Applicative (FreshT m) | |
| (Functor m, MonadPlus m) => Alternative (FreshT m) | |
| (Functor m, Monad m) => MonadFresh (FreshT m) | |
| MonadDisj m => MonadDisj (FreshT m) |
freshT :: (FreshState -> m (a, FreshState)) -> FreshT m aSource
Construct a FreshT action from a FreshState modification.
runFreshT :: FreshT m a -> FreshState -> m (a, FreshState)Source
Run a computation with a fresh name supply.
evalFreshT :: Monad m => FreshT m a -> FreshState -> m aSource
Evaluate a computation with a fresh name supply.
execFreshT :: Monad m => FreshT m a -> FreshState -> m FreshStateSource
Execute a computation with a fresh name supply.
Fresh name generation
type FreshState = IntegerSource
The state of the name supply: the first unused sequence number of every name.
nothingUsed :: FreshStateSource
The empty fresh state.
module Control.Monad
module Control.Monad.Fix
module Control.Monad.Trans