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>Control.Monad.Writer.Lazy</TITLE
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>mtl-1.1.0.2: Monad transformer library</TD
><TD CLASS="topbut"
><A HREF="index.html"
>Contents</A
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><A HREF="doc-index.html"
>Index</A
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><FONT SIZE="6"
>Control.Monad.Writer.Lazy</FONT
></TD
><TD ALIGN="right"
><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>non-portable (multi-param classes, functional dependencies)</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
>Lazy writer monads.
</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/pubs/springschool.html"
>http://web.cecs.pdx.edu/~mpj/pubs/springschool.html</A
>)
          Advanced School of Functional Programming, 1995.
</P
></TD
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><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"
>module <A HREF="Control-Monad-Writer-Class.html"
>Control.Monad.Writer.Class</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>newtype</SPAN
>  <A NAME="t:Writer"
><A NAME="t%3AWriter"
></A
></A
><B
>Writer</B
> w a </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="5" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:Writer"
><A NAME="v%3AWriter"
></A
></A
><B
>Writer</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="body" COLSPAN="2"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:runWriter"
><A NAME="v%3ArunWriter"
></A
></A
><B
>runWriter</B
> :: (a, w)</TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:Writer')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:Writer" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="../base/Data-Monoid.html#t%3AMonoid"
>Monoid</A
> w =&gt; <A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w (<A HREF="Control-Monad-Writer-Lazy.html#t%3AWriter"
>Writer</A
> w)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="../base/Data-Monoid.html#t%3AMonoid"
>Monoid</A
> w =&gt; <A HREF="../base/Control-Monad.html#t%3AMonad"
>Monad</A
> (<A HREF="Control-Monad-Writer-Lazy.html#t%3AWriter"
>Writer</A
> w)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="../base/Control-Monad.html#t%3AFunctor"
>Functor</A
> (<A HREF="Control-Monad-Writer-Lazy.html#t%3AWriter"
>Writer</A
> w)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="../base/Data-Monoid.html#t%3AMonoid"
>Monoid</A
> w =&gt; <A HREF="../base/Control-Monad-Fix.html#t%3AMonadFix"
>MonadFix</A
> (<A HREF="Control-Monad-Writer-Lazy.html#t%3AWriter"
>Writer</A
> w)</TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:execWriter"
><A NAME="v%3AexecWriter"
></A
></A
><B
>execWriter</B
> ::  <A HREF="Control-Monad-Writer-Lazy.html#t%3AWriter"
>Writer</A
> w a -&gt; w</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mapWriter"
><A NAME="v%3AmapWriter"
></A
></A
><B
>mapWriter</B
> ::  ((a, w) -&gt; (b, w')) -&gt; <A HREF="Control-Monad-Writer-Lazy.html#t%3AWriter"
>Writer</A
> w a -&gt; <A HREF="Control-Monad-Writer-Lazy.html#t%3AWriter"
>Writer</A
> w' b</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>newtype</SPAN
>  <A NAME="t:WriterT"
><A NAME="t%3AWriterT"
></A
></A
><B
>WriterT</B
> w m a </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="5" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:WriterT"
><A NAME="v%3AWriterT"
></A
></A
><B
>WriterT</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="body" COLSPAN="2"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:runWriterT"
><A NAME="v%3ArunWriterT"
></A
></A
><B
>runWriterT</B
> :: m (a, w)</TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:WriterT')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:WriterT" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
>(<A HREF="../base/Data-Monoid.html#t%3AMonoid"
>Monoid</A
> w, <A HREF="../base/Control-Monad.html#t%3AMonad"
>Monad</A
> m) =&gt; <A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w (<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-State-Class.html#t%3AMonadState"
>MonadState</A
> s m) =&gt; <A HREF="Control-Monad-State-Class.html#t%3AMonadState"
>MonadState</A
> s (<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-Reader-Class.html#t%3AMonadReader"
>MonadReader</A
> r m) =&gt; <A HREF="Control-Monad-Reader-Class.html#t%3AMonadReader"
>MonadReader</A
> r (<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-Error-Class.html#t%3AMonadError"
>MonadError</A
> e m) =&gt; <A HREF="Control-Monad-Error-Class.html#t%3AMonadError"
>MonadError</A
> e (<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 =&gt; <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="../base/Control-Monad.html#t%3AMonad"
>Monad</A
> m) =&gt; <A HREF="../base/Control-Monad.html#t%3AMonad"
>Monad</A
> (<A HREF="Control-Monad-Writer-Lazy.html#t%3AWriterT"
>WriterT</A
> w m)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="../base/Control-Monad.html#t%3AMonad"
>Monad</A
> m =&gt; <A HREF="../base/Control-Monad.html#t%3AFunctor"
>Functor</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="../base/Control-Monad-Fix.html#t%3AMonadFix"
>MonadFix</A
> m) =&gt; <A HREF="../base/Control-Monad-Fix.html#t%3AMonadFix"
>MonadFix</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="../base/Control-Monad.html#t%3AMonadPlus"
>MonadPlus</A
> m) =&gt; <A HREF="../base/Control-Monad.html#t%3AMonadPlus"
>MonadPlus</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) =&gt; <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-Cont-Class.html#t%3AMonadCont"
>MonadCont</A
> m) =&gt; <A HREF="Control-Monad-Cont-Class.html#t%3AMonadCont"
>MonadCont</A
> (<A HREF="Control-Monad-Writer-Lazy.html#t%3AWriterT"
>WriterT</A
> w m)</TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:execWriterT"
><A NAME="v%3AexecWriterT"
></A
></A
><B
>execWriterT</B
> :: <A HREF="../base/Control-Monad.html#t%3AMonad"
>Monad</A
> m =&gt; <A HREF="Control-Monad-Writer-Lazy.html#t%3AWriterT"
>WriterT</A
> w m a -&gt; m w</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mapWriterT"
><A NAME="v%3AmapWriterT"
></A
></A
><B
>mapWriterT</B
> ::  (m (a, w) -&gt; n (b, w')) -&gt; <A HREF="Control-Monad-Writer-Lazy.html#t%3AWriterT"
>WriterT</A
> w m a -&gt; <A HREF="Control-Monad-Writer-Lazy.html#t%3AWriterT"
>WriterT</A
> w' n b</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
>module <A HREF="../base/Control-Monad.html"
>Control.Monad</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
>module <A HREF="../base/Control-Monad-Fix.html"
>Control.Monad.Fix</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
>module <A HREF="Control-Monad-Trans.html"
>Control.Monad.Trans</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
>module <A HREF="../base/Data-Monoid.html"
>Data.Monoid</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="botbar"
>Produced by <A HREF="http://www.haskell.org/haddock/"
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