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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 | Source |
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Constructors | STIO | | trans :: state -> IO (res, state) | |
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| Instances | |
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lift IO command to StateIO
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state inspection command: a "show"-like function is applied to the state
and the result is written to stderr.
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change the state with a given function and return the new state
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set the state
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read the state
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run a StateIO command with an initial state
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Produced by Haddock version 2.4.2 |