| hxt-filter-8.0.0: A collection of tools for processing XML with Haskell (Filter variant). | Contents | Index |
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Control.Monad.MonadStateIO |
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Description |
general usefull state monad for a local state and IO
This module is used for threading a state and io actions
through a computation.
Here the monad is constructed by hand.
It could easily be refactored with the use of the monad transformer library.
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Synopsis |
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Documentation |
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newtype StateIO state res |
Constructors | STIO | | trans :: state -> IO (res, state) | |
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| Instances | |
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io :: IO a -> StateIO state a |
lift IO command to StateIO
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trcState :: (state -> String) -> StateIO state () |
state inspection command: a "show"-like function is applied to the state
and the result is written to stderr.
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changeState :: (state -> state) -> StateIO state state |
change the state with a given function and return the new state
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setState :: state -> StateIO state state |
set the state
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getState :: StateIO state state |
read the state
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run :: state -> StateIO state res -> IO res |
run a StateIO command with an initial state
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Produced by Haddock version 2.1.0 |