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The latest version of lazyio is 0.1.0.4-1.

lazyio

Version 0.1.0.4 revision 0 uploaded by HenningThielemann.

Package meta

Synopsis
Run IO actions lazily while respecting their order
Description

Run IO actions lazily while respecting their order. Running a value of the LazyIO monad in the IO monad is like starting a thread which is however driven by its output. That is, the LazyIO action is only executed as far as necessary in order to provide the required data.

The package may help you to avoid stack overflows in mapM. Say you have

mapM f xs

where xs is a long list. When run, you may encounter a stack overflow. To prevent it, write instead:

import qualified System.IO.Lazy as LazyIO

LazyIO.run $ mapM (LazyIO.interleave . f) xs

The stack overflow is gone.

Author
Henning Thielemann <haskell@henning-thielemann.de>
Bug reports
n/a
Category
Monads, Control
Copyright
n/a
Homepage
http://www.haskell.org/haskellwiki/Lazy_IO
Maintainer
Henning Thielemann <haskell@henning-thielemann.de>
Package URL
n/a
Stability
n/a

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