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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
></TD
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><FONT SIZE="6"
>Control.Monad.Writer.Class</FONT
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><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
>The MonadWriter 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/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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></TD
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><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 HREF="../base/Data-Monoid.html#t%3AMonoid"
>Monoid</A
> w, <A HREF="../base/Control-Monad.html#t%3AMonad"
>Monad</A
> m) =&gt; <A NAME="t:MonadWriter"
><A NAME="t%3AMonadWriter"
></A
></A
><B
>MonadWriter</B
> w m | m -&gt; w <SPAN CLASS="keyword"
>where</SPAN
></TD
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><TR
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><TD CLASS="section4"
>Methods</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A NAME="v:tell"
><A NAME="v%3Atell"
></A
></A
><B
>tell</B
> :: w -&gt; m <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:listen"
><A NAME="v%3Alisten"
></A
></A
><B
>listen</B
> ::  m a -&gt; m (a, w)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:pass"
><A NAME="v%3Apass"
></A
></A
><B
>pass</B
> ::  m (a, w -&gt; w) -&gt; 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:MonadWriter')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:MonadWriter" 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="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w (<A HREF="Control-Monad-Writer-Strict.html#t%3AWriter"
>Writer</A
> w)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Control-Monad-Error-Class.html#t%3AError"
>Error</A
> e, <A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w m) =&gt; <A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w (<A HREF="Control-Monad-Error.html#t%3AErrorT"
>ErrorT</A
> e m)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w m =&gt; <A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w (<A HREF="Control-Monad-Reader.html#t%3AReaderT"
>ReaderT</A
> r m)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w m =&gt; <A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w (<A HREF="Control-Monad-State-Lazy.html#t%3AStateT"
>StateT</A
> s m)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w m =&gt; <A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w (<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="../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="../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-Strict.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-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w (<A HREF="Control-Monad-RWS-Lazy.html#t%3ARWS"
>RWS</A
> r w s)</TD
></TR
><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-RWS-Strict.html#t%3ARWS"
>RWS</A
> r w s)</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="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w (<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="../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-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="decl"
><A NAME="v:listens"
><A NAME="v%3Alistens"
></A
></A
><B
>listens</B
> :: <A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w m =&gt; (w -&gt; b) -&gt; m a -&gt; m (a, b)</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:censor"
><A NAME="v%3Acensor"
></A
></A
><B
>censor</B
> :: <A HREF="Control-Monad-Writer-Class.html#t%3AMonadWriter"
>MonadWriter</A
> w m =&gt; (w -&gt; w) -&gt; m a -&gt; m a</TD
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>Haddock</A
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