<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Control.Monad.Trans.List</title><link href="ocean.css" rel="stylesheet" type="text/css" title="Ocean" /><script src="haddock-util.js" type="text/javascript"></script><script type="text/javascript">//<![CDATA[
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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="src/Control-Monad-Trans-List.html">Source</a></li><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">transformers-0.2.2.0: Concrete functor and monad transformers</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Portability</th><td>portable</td></tr><tr><th>Stability</th><td>experimental</td></tr><tr><th>Maintainer</th><td>ross@soi.city.ac.uk</td></tr></table><p class="caption">Control.Monad.Trans.List</p></div><div id="table-of-contents"><p class="caption">Contents</p><ul><li><a href="#g:1">The ListT monad transformer
</a></li><li><a href="#g:2">Lifting other operations
</a></li></ul></div><div id="description"><p class="caption">Description</p><div class="doc"><p>The ListT monad transformer, adding backtracking to a given monad,
which must be commutative.
</p></div></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><span class="keyword">newtype</span> <a href="#t:ListT">ListT</a> m a = <a href="#v:ListT">ListT</a> {<ul class="subs"><li><a href="#v:runListT">runListT</a> :: m [a]</li></ul>}</li><li class="src short"><a href="#v:mapListT">mapListT</a> :: (m [a] -> n [b]) -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> n b</li><li class="src short"><a href="#v:liftCallCC">liftCallCC</a> :: ((([a] -> m [b]) -> m [a]) -> m [a]) -> ((a -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m b) -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a) -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a</li><li class="src short"><a href="#v:liftCatch">liftCatch</a> :: (m [a] -> (e -> m [a]) -> m [a]) -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a -> (e -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a) -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a</li></ul></div><div id="interface"><h1 id="g:1">The ListT monad transformer
</h1><div class="top"><p class="src"><span class="keyword">newtype</span> <a name="t:ListT" class="def">ListT</a> m a <a href="src/Control-Monad-Trans-List.html#ListT" class="link">Source</a></p><div class="doc"><p>Parameterizable list monad, with an inner monad.
</p><p><em>Note:</em> this does not yield a monad unless the argument monad is commutative.
</p></div><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:ListT" class="def">ListT</a></td><td class="doc empty"> </td></tr><tr><td colspan="2"><div class="subs fields"><p class="caption">Fields</p><dl><dt class="src"><a name="v:runListT" class="def">runListT</a> :: m [a]</dt><dd class="doc empty"> </dd></dl><div class="clear"></div></div></td></tr></table></div><div class="subs instances"><p id="control.i:ListT" class="caption collapser" onclick="toggleSection('i:ListT')">Instances</p><div id="section.i:ListT" class="show"><table><tr><td class="src"><a href="Control-Monad-Trans-Class.html#t:MonadTrans">MonadTrans</a> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Control-Monad.html#t:Monad">Monad</a> m => <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Control-Monad.html#t:Monad">Monad</a> (<a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m)</td><td class="doc empty"> </td></tr><tr><td class="src"><a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Control-Monad.html#t:Functor">Functor</a> m => <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Control-Monad.html#t:Functor">Functor</a> (<a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m)</td><td class="doc empty"> </td></tr><tr><td class="src"><a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Control-Monad.html#t:Monad">Monad</a> m => <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Control-Monad.html#t:MonadPlus">MonadPlus</a> (<a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m)</td><td class="doc empty"> </td></tr><tr><td class="src"><a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Control-Applicative.html#t:Applicative">Applicative</a> m => <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Control-Applicative.html#t:Applicative">Applicative</a> (<a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m)</td><td class="doc empty"> </td></tr><tr><td class="src"><a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Control-Applicative.html#t:Applicative">Applicative</a> m => <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Control-Applicative.html#t:Alternative">Alternative</a> (<a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m)</td><td class="doc empty"> </td></tr><tr><td class="src"><a href="Control-Monad-IO-Class.html#t:MonadIO">MonadIO</a> m => <a href="Control-Monad-IO-Class.html#t:MonadIO">MonadIO</a> (<a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m)</td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><a name="v:mapListT" class="def">mapListT</a> :: (m [a] -> n [b]) -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> n b<a href="src/Control-Monad-Trans-List.html#mapListT" class="link">Source</a></p><div class="doc"><p>Map between <code><a href="Control-Monad-Trans-List.html#t:ListT">ListT</a></code> computations.
</p><ul><li> <code><code><a href="Control-Monad-Trans-List.html#v:runListT">runListT</a></code> (<code><a href="Control-Monad-Trans-List.html#v:mapListT">mapListT</a></code> f m) = f (<code><a href="Control-Monad-Trans-List.html#v:runListT">runListT</a></code> m</code>)
</li></ul></div></div><h1 id="g:2">Lifting other operations
</h1><div class="top"><p class="src"><a name="v:liftCallCC" class="def">liftCallCC</a> :: ((([a] -> m [b]) -> m [a]) -> m [a]) -> ((a -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m b) -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a) -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a<a href="src/Control-Monad-Trans-List.html#liftCallCC" class="link">Source</a></p><div class="doc"><p>Lift a <code>callCC</code> operation to the new monad.
</p></div></div><div class="top"><p class="src"><a name="v:liftCatch" class="def">liftCatch</a> :: (m [a] -> (e -> m [a]) -> m [a]) -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a -> (e -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a) -> <a href="Control-Monad-Trans-List.html#t:ListT">ListT</a> m a<a href="src/Control-Monad-Trans-List.html#liftCatch" class="link">Source</a></p><div class="doc"><p>Lift a <code>catchError</code> operation to the new monad.
</p></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.9.2</p></div></body></html>
