<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!--Rendered using the Haskell Html Library v0.2--> <HTML ><HEAD ><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8" ><TITLE >Control.Monad.Trans</TITLE ><LINK HREF="haddock.css" REL="stylesheet" TYPE="text/css" ><SCRIPT SRC="haddock-util.js" TYPE="text/javascript" ></SCRIPT ><SCRIPT TYPE="text/javascript" >window.onload = function () {setSynopsis("mini_Control-Monad-Trans.html")};</SCRIPT ></HEAD ><BODY ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="topbar" ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD ><IMG SRC="haskell_icon.gif" WIDTH="16" HEIGHT="16" ALT=" " ></TD ><TD CLASS="title" >mtl-1.1.0.2: Monad transformer library</TD ><TD CLASS="topbut" ><A HREF="index.html" >Contents</A ></TD ><TD CLASS="topbut" ><A HREF="doc-index.html" >Index</A ></TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="modulebar" ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD ><FONT SIZE="6" >Control.Monad.Trans</FONT ></TD ><TD ALIGN="right" ><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="infohead" >Portability</TD ><TD CLASS="infoval" >portable</TD ></TR ><TR ><TD CLASS="infohead" >Stability</TD ><TD CLASS="infoval" >experimental</TD ></TR ><TR ><TD CLASS="infohead" >Maintainer</TD ><TD CLASS="infoval" >libraries@haskell.org</TD ></TR ></TABLE ></TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="section1" >Description</TD ></TR ><TR ><TD CLASS="doc" ><P >The MonadTrans class. </P ><P >Inspired by the paper /Functional Programming with Overloading and Higher-Order Polymorphism/, Mark P Jones (<A HREF="http://web.cecs.pdx.edu/~mpj/" >http://web.cecs.pdx.edu/~mpj/</A >) Advanced School of Functional Programming, 1995. </P ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="section1" >Documentation</TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="decl" ><SPAN CLASS="keyword" >class</SPAN > <A NAME="t:MonadTrans" ><A NAME="t%3AMonadTrans" ></A ></A ><B >MonadTrans</B > t <SPAN CLASS="keyword" >where</SPAN ></TD ></TR ><TR ><TD CLASS="body" ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="s8" ></TD ></TR ><TR ><TD CLASS="section4" >Methods</TD ></TR ><TR ><TD CLASS="body" ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="decl" ><A NAME="v:lift" ><A NAME="v%3Alift" ></A ></A ><B >lift</B > :: <A HREF="../base/Control-Monad.html#t%3AMonad" >Monad</A > m => m a -> t m a</TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="s8" ></TD ></TR ><TR ><TD CLASS="section4" ><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:MonadTrans')" ALT="show/hide" > Instances</TD ></TR ><TR ><TD CLASS="body" ><DIV ID="i:MonadTrans" STYLE="display:block;" ><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0" ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadTrans" >MonadTrans</A > <A HREF="Control-Monad-List.html#t%3AListT" >ListT</A ></TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Error-Class.html#t%3AError" >Error</A > e => <A HREF="Control-Monad-Trans.html#t%3AMonadTrans" >MonadTrans</A > (<A HREF="Control-Monad-Error.html#t%3AErrorT" >ErrorT</A > e)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadTrans" >MonadTrans</A > (<A HREF="Control-Monad-Reader.html#t%3AReaderT" >ReaderT</A > r)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadTrans" >MonadTrans</A > (<A HREF="Control-Monad-State-Lazy.html#t%3AStateT" >StateT</A > s)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadTrans" >MonadTrans</A > (<A HREF="Control-Monad-State-Strict.html#t%3AStateT" >StateT</A > s)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="../base/Data-Monoid.html#t%3AMonoid" >Monoid</A > w => <A HREF="Control-Monad-Trans.html#t%3AMonadTrans" >MonadTrans</A > (<A HREF="Control-Monad-Writer-Lazy.html#t%3AWriterT" >WriterT</A > w)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="../base/Data-Monoid.html#t%3AMonoid" >Monoid</A > w => <A HREF="Control-Monad-Trans.html#t%3AMonadTrans" >MonadTrans</A > (<A HREF="Control-Monad-Writer-Strict.html#t%3AWriterT" >WriterT</A > w)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadTrans" >MonadTrans</A > (<A HREF="Control-Monad-Cont.html#t%3AContT" >ContT</A > r)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="../base/Data-Monoid.html#t%3AMonoid" >Monoid</A > w => <A HREF="Control-Monad-Trans.html#t%3AMonadTrans" >MonadTrans</A > (<A HREF="Control-Monad-RWS-Lazy.html#t%3ARWST" >RWST</A > r w s)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="../base/Data-Monoid.html#t%3AMonoid" >Monoid</A > w => <A HREF="Control-Monad-Trans.html#t%3AMonadTrans" >MonadTrans</A > (<A HREF="Control-Monad-RWS-Strict.html#t%3ARWST" >RWST</A > r w s)</TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="decl" ><SPAN CLASS="keyword" >class</SPAN > <A HREF="../base/Control-Monad.html#t%3AMonad" >Monad</A > m => <A NAME="t:MonadIO" ><A NAME="t%3AMonadIO" ></A ></A ><B >MonadIO</B > m <SPAN CLASS="keyword" >where</SPAN ></TD ></TR ><TR ><TD CLASS="body" ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="s8" ></TD ></TR ><TR ><TD CLASS="section4" >Methods</TD ></TR ><TR ><TD CLASS="body" ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="decl" ><A NAME="v:liftIO" ><A NAME="v%3AliftIO" ></A ></A ><B >liftIO</B > :: <A HREF="../base/System-IO.html#t%3AIO" >IO</A > a -> m a</TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="s8" ></TD ></TR ><TR ><TD CLASS="section4" ><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:MonadIO')" ALT="show/hide" > Instances</TD ></TR ><TR ><TD CLASS="body" ><DIV ID="i:MonadIO" STYLE="display:block;" ><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0" ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > <A HREF="../base/System-IO.html#t%3AIO" >IO</A ></TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > m => <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > (<A HREF="Control-Monad-List.html#t%3AListT" >ListT</A > m)</TD ></TR ><TR ><TD CLASS="decl" >(<A HREF="Control-Monad-Error-Class.html#t%3AError" >Error</A > e, <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > m) => <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > (<A HREF="Control-Monad-Error.html#t%3AErrorT" >ErrorT</A > e m)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > m => <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > (<A HREF="Control-Monad-Reader.html#t%3AReaderT" >ReaderT</A > r m)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > m => <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > (<A HREF="Control-Monad-State-Lazy.html#t%3AStateT" >StateT</A > s m)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > m => <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > (<A HREF="Control-Monad-State-Strict.html#t%3AStateT" >StateT</A > s m)</TD ></TR ><TR ><TD CLASS="decl" >(<A HREF="../base/Data-Monoid.html#t%3AMonoid" >Monoid</A > w, <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > m) => <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > (<A HREF="Control-Monad-Writer-Lazy.html#t%3AWriterT" >WriterT</A > w m)</TD ></TR ><TR ><TD CLASS="decl" >(<A HREF="../base/Data-Monoid.html#t%3AMonoid" >Monoid</A > w, <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > m) => <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > (<A HREF="Control-Monad-Writer-Strict.html#t%3AWriterT" >WriterT</A > w m)</TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > m => <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > (<A HREF="Control-Monad-Cont.html#t%3AContT" >ContT</A > r m)</TD ></TR ><TR ><TD CLASS="decl" >(<A HREF="../base/Data-Monoid.html#t%3AMonoid" >Monoid</A > w, <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > m) => <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > (<A HREF="Control-Monad-RWS-Lazy.html#t%3ARWST" >RWST</A > r w s m)</TD ></TR ><TR ><TD CLASS="decl" >(<A HREF="../base/Data-Monoid.html#t%3AMonoid" >Monoid</A > w, <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > m) => <A HREF="Control-Monad-Trans.html#t%3AMonadIO" >MonadIO</A > (<A HREF="Control-Monad-RWS-Strict.html#t%3ARWST" >RWST</A > r w s m)</TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="botbar" 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