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ghc-6.10.4-1mdv2010.0.i586.rpm

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>base-4.1.0.0: Basic libraries</TD
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><A HREF="index.html"
>Contents</A
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>Index</A
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><TD CLASS="modulebar"
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>Data.Data</FONT
></TD
><TD ALIGN="right"
><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>non-portable (local universal quantification)</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
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><TR
><TD
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="section4"
><B
>Contents</B
></TD
></TR
><TR
><TD
><DL
><DT
><A HREF="#1"
>Module Data.Typeable re-exported for convenience
</A
></DT
><DT
><A HREF="#2"
>The Data class for processing constructor applications
</A
></DT
><DT
><A HREF="#3"
>Datatype representations
</A
></DT
><DD
><DL
><DT
><A HREF="#4"
>Constructors
</A
></DT
><DT
><A HREF="#5"
>Observers
</A
></DT
><DT
><A HREF="#6"
>Convenience functions
</A
></DT
></DL
></DD
><DT
><A HREF="#7"
>Data constructor representations
</A
></DT
><DD
><DL
><DT
><A HREF="#8"
>Constructors
</A
></DT
><DT
><A HREF="#9"
>Observers
</A
></DT
><DT
><A HREF="#10"
>Convenience function: algebraic data types
</A
></DT
><DT
><A HREF="#11"
>From strings to constructors and vice versa: all data types
</A
></DT
></DL
></DD
><DT
><A HREF="#12"
>Convenience functions: take type constructors apart
</A
></DT
><DT
><A HREF="#13"
>Generic operations defined in terms of <TT
><A HREF="Data-Data.html#v%3Agunfold"
>gunfold</A
></TT
>
</A
></DT
></DL
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
><P
>&quot;Scrap your boilerplate&quot; --- Generic programming in Haskell.
 See <A HREF="http://www.cs.vu.nl/boilerplate/"
>http://www.cs.vu.nl/boilerplate/</A
>. This module provides
 the <TT
><A HREF="Data-Data.html#t%3AData"
>Data</A
></TT
> class with its primitives for generic programming, along
 with instances for many datatypes. It corresponds to a merge between
 the previous <A HREF="Data-Generics-Basics.html"
>Data.Generics.Basics</A
> and almost all of 
 <A HREF="Data-Generics-Instances.html"
>Data.Generics.Instances</A
>. The instances that are not present
 in this module were moved to the <TT
>Data.Generics.Instances</TT
> module
 in the <TT
>syb</TT
> package.
</P
><P
>For more information, please visit the new
 SYB wiki: <A HREF="http://www.cs.uu.nl/wiki/bin/view/GenericProgramming/SYB"
>http://www.cs.uu.nl/wiki/bin/view/GenericProgramming/SYB</A
>.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Synopsis</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
>module <A HREF="Data-Typeable.html"
>Data.Typeable</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>class</SPAN
> <A HREF="Data-Typeable.html#t%3ATypeable"
>Typeable</A
> a =&gt; <A HREF="#t%3AData"
>Data</A
> a  <SPAN CLASS="keyword"
>where</SPAN
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="#v%3Agfoldl"
>gfoldl</A
> ::  (<SPAN CLASS="keyword"
>forall</SPAN
> d b. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; c (d -&gt; b) -&gt; d -&gt; c b) -&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> g.  g -&gt; c g) -&gt; a -&gt; c a</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Agunfold"
>gunfold</A
> ::  (<SPAN CLASS="keyword"
>forall</SPAN
> b r. <A HREF="Data-Data.html#t%3AData"
>Data</A
> b =&gt; c (b -&gt; r) -&gt; c r) -&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> r.  r -&gt; c r) -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; c a</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AtoConstr"
>toConstr</A
> :: a -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AdataTypeOf"
>dataTypeOf</A
> :: a -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AdataCast1"
>dataCast1</A
> :: <A HREF="Data-Typeable.html#t%3ATypeable1"
>Typeable1</A
> t =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; c (t d)) -&gt; <A HREF="Data-Maybe.html#t%3AMaybe"
>Maybe</A
> (c a)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AdataCast2"
>dataCast2</A
> :: <A HREF="Data-Typeable.html#t%3ATypeable2"
>Typeable2</A
> t =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d e. (<A HREF="Data-Data.html#t%3AData"
>Data</A
> d, <A HREF="Data-Data.html#t%3AData"
>Data</A
> e) =&gt; c (t d e)) -&gt; <A HREF="Data-Maybe.html#t%3AMaybe"
>Maybe</A
> (c a)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgmapT"
>gmapT</A
> :: (<SPAN CLASS="keyword"
>forall</SPAN
> b. <A HREF="Data-Data.html#t%3AData"
>Data</A
> b =&gt; b -&gt; b) -&gt; a -&gt; a</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgmapQl"
>gmapQl</A
> ::  (r -&gt; r' -&gt; r) -&gt; r -&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; r') -&gt; a -&gt; r</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgmapQr"
>gmapQr</A
> ::  (r' -&gt; r -&gt; r) -&gt; r -&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; r') -&gt; a -&gt; r</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgmapQ"
>gmapQ</A
> ::  (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; u) -&gt; a -&gt; [u]</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgmapQi"
>gmapQi</A
> ::  <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; u) -&gt; a -&gt; u</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgmapM"
>gmapM</A
> :: <A HREF="Control-Monad.html#t%3AMonad"
>Monad</A
> m =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; m d) -&gt; a -&gt; m a</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgmapMp"
>gmapMp</A
> :: <A HREF="Control-Monad.html#t%3AMonadPlus"
>MonadPlus</A
> m =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; m d) -&gt; a -&gt; m a</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgmapMo"
>gmapMo</A
> :: <A HREF="Control-Monad.html#t%3AMonadPlus"
>MonadPlus</A
> m =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; m d) -&gt; a -&gt; m a</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3ADataType"
>DataType</A
> </TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AmkDataType"
>mkDataType</A
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; [<A HREF="Data-Data.html#t%3AConstr"
>Constr</A
>] -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AmkIntType"
>mkIntType</A
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AmkFloatType"
>mkFloatType</A
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AmkStringType"
>mkStringType</A
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AmkNorepType"
>mkNorepType</A
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AdataTypeName"
>dataTypeName</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3ADataRep"
>DataRep</A
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
>= <A HREF="#v%3AAlgRep"
>AlgRep</A
> [<A HREF="Data-Data.html#t%3AConstr"
>Constr</A
>]</TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AIntRep"
>IntRep</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AFloatRep"
>FloatRep</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AStringRep"
>StringRep</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3ANoRep"
>NoRep</A
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AdataTypeRep"
>dataTypeRep</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Data.html#t%3ADataRep"
>DataRep</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3ArepConstr"
>repConstr</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Data.html#t%3AConstrRep"
>ConstrRep</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AisAlgType"
>isAlgType</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="../ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AdataTypeConstrs"
>dataTypeConstrs</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; [<A HREF="Data-Data.html#t%3AConstr"
>Constr</A
>]</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AindexConstr"
>indexConstr</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Data.html#t%3AConIndex"
>ConIndex</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AmaxConstrIndex"
>maxConstrIndex</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Data.html#t%3AConIndex"
>ConIndex</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AisNorepType"
>isNorepType</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="../ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3AConstr"
>Constr</A
> </TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>type</SPAN
> <A HREF="#t%3AConIndex"
>ConIndex</A
> = <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3AFixity"
>Fixity</A
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
>= <A HREF="#v%3APrefix"
>Prefix</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AInfix"
>Infix</A
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AmkConstr"
>mkConstr</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; [<A HREF="Data-Char.html#t%3AString"
>String</A
>] -&gt; <A HREF="Data-Data.html#t%3AFixity"
>Fixity</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AmkIntConstr"
>mkIntConstr</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="../integer/GHC-Integer.html#t%3AInteger"
>Integer</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AmkFloatConstr"
>mkFloatConstr</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="../ghc-prim/GHC-Types.html#t%3ADouble"
>Double</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AmkStringConstr"
>mkStringConstr</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AconstrType"
>constrType</A
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3AConstrRep"
>ConstrRep</A
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
>= <A HREF="#v%3AAlgConstr"
>AlgConstr</A
> <A HREF="Data-Data.html#t%3AConIndex"
>ConIndex</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AIntConstr"
>IntConstr</A
> <A HREF="../integer/GHC-Integer.html#t%3AInteger"
>Integer</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AFloatConstr"
>FloatConstr</A
> <A HREF="../ghc-prim/GHC-Types.html#t%3ADouble"
>Double</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AStringConstr"
>StringConstr</A
> <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AconstrRep"
>constrRep</A
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; <A HREF="Data-Data.html#t%3AConstrRep"
>ConstrRep</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AconstrFields"
>constrFields</A
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; [<A HREF="Data-Char.html#t%3AString"
>String</A
>]</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AconstrFixity"
>constrFixity</A
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; <A HREF="Data-Data.html#t%3AFixity"
>Fixity</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AconstrIndex"
>constrIndex</A
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; <A HREF="Data-Data.html#t%3AConIndex"
>ConIndex</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AshowConstr"
>showConstr</A
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AreadConstr"
>readConstr</A
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Maybe.html#t%3AMaybe"
>Maybe</A
> <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AtyconUQname"
>tyconUQname</A
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AtyconModule"
>tyconModule</A
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AfromConstr"
>fromConstr</A
> :: <A HREF="Data-Data.html#t%3AData"
>Data</A
> a =&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AfromConstrB"
>fromConstrB</A
> :: <A HREF="Data-Data.html#t%3AData"
>Data</A
> a =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d) -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AfromConstrM"
>fromConstrM</A
> :: (<A HREF="Control-Monad.html#t%3AMonad"
>Monad</A
> m, <A HREF="Data-Data.html#t%3AData"
>Data</A
> a) =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; m d) -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; m a</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="1"
><A NAME="1"
>Module Data.Typeable re-exported for convenience
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
>module <A HREF="Data-Typeable.html"
>Data.Typeable</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="2"
><A NAME="2"
>The Data class for processing constructor applications
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>class</SPAN
> <A HREF="Data-Typeable.html#t%3ATypeable"
>Typeable</A
> a =&gt; <A NAME="t:Data"
><A NAME="t%3AData"
></A
></A
><B
>Data</B
> a  <SPAN CLASS="keyword"
>where</SPAN
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
><P
>The <TT
><A HREF="Data-Data.html#t%3AData"
>Data</A
></TT
> class comprehends a fundamental primitive <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
> for
folding over constructor applications, say terms. This primitive can
be instantiated in several ways to map over the immediate subterms
of a term; see the <TT
>gmap</TT
> combinators later in this class.  Indeed, a
generic programmer does not necessarily need to use the ingenious gfoldl
primitive but rather the intuitive <TT
>gmap</TT
> combinators.  The <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
>
primitive is completed by means to query top-level constructors, to
turn constructor representations into proper terms, and to list all
possible datatype constructors.  This completion allows us to serve
generic programming scenarios like read, show, equality, term generation.
</P
><P
>The combinators <TT
><A HREF="Data-Data.html#v%3AgmapT"
>gmapT</A
></TT
>, <TT
><A HREF="Data-Data.html#v%3AgmapQ"
>gmapQ</A
></TT
>, <TT
><A HREF="Data-Data.html#v%3AgmapM"
>gmapM</A
></TT
>, etc are all provided with
default definitions in terms of <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
>, leaving open the opportunity
to provide datatype-specific definitions.
(The inclusion of the <TT
>gmap</TT
> combinators as members of class <TT
><A HREF="Data-Data.html#t%3AData"
>Data</A
></TT
>
allows the programmer or the compiler to derive specialised, and maybe
more efficient code per datatype.  <EM
>Note</EM
>: <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
> is more higher-order
than the <TT
>gmap</TT
> combinators.  This is subject to ongoing benchmarking
experiments.  It might turn out that the <TT
>gmap</TT
> combinators will be
moved out of the class <TT
><A HREF="Data-Data.html#t%3AData"
>Data</A
></TT
>.)
</P
><P
>Conceptually, the definition of the <TT
>gmap</TT
> combinators in terms of the
primitive <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
> requires the identification of the <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
> function
arguments.  Technically, we also need to identify the type constructor
<TT
>c</TT
> for the construction of the result type from the folded term type.
</P
><P
>In the definition of <TT
>gmapQ</TT
><EM
>x</EM
> combinators, we use phantom type
constructors for the <TT
>c</TT
> in the type of <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
> because the result type
of a query does not involve the (polymorphic) type of the term argument.
In the definition of <TT
><A HREF="Data-Data.html#v%3AgmapQl"
>gmapQl</A
></TT
> we simply use the plain constant type
constructor because <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
> is left-associative anyway and so it is
readily suited to fold a left-associative binary operation over the
immediate subterms.  In the definition of gmapQr, extra effort is
needed. We use a higher-order accumulation trick to mediate between
left-associative constructor application vs. right-associative binary
operation (e.g., <TT
>(:)</TT
>).  When the query is meant to compute a value
of type <TT
>r</TT
>, then the result type withing generic folding is <TT
>r -&gt; r</TT
>.
So the result of folding is a function to which we finally pass the
right unit.
</P
><P
>With the <TT
>-XDeriveDataTypeable</TT
> option, GHC can generate instances of the
<TT
><A HREF="Data-Data.html#t%3AData"
>Data</A
></TT
> class automatically.  For example, given the declaration
</P
><PRE
> data T a b = C1 a b | C2 deriving (Typeable, Data)
</PRE
><P
>GHC will generate an instance that is equivalent to
</P
><PRE
> instance (Data a, Data b) =&gt; Data (T a b) where
     gfoldl k z (C1 a b) = z C1 `k` a `k` b
     gfoldl k z C2       = z C2

     gunfold k z c = case constrIndex c of
                         1 -&gt; k (k (z C1))
                         2 -&gt; z C2

     toConstr (C1 _ _) = con_C1
     toConstr C2       = con_C2

     dataTypeOf _ = ty_T

 con_C1 = mkConstr ty_T &quot;C1&quot; [] Prefix
 con_C2 = mkConstr ty_T &quot;C2&quot; [] Prefix
 ty_T   = mkDataType &quot;Module.T&quot; [con_C1, con_C2]
</PRE
><P
>This is suitable for datatypes that are exported transparently.
</P
></TD
></TR
><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:gfoldl"
><A NAME="v%3Agfoldl"
></A
></A
><B
>gfoldl</B
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="arg"
>:: </TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
>=&gt; <SPAN CLASS="keyword"
>forall</SPAN
> d b. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; c (d -&gt; b) -&gt; d -&gt; c b</TD
><TD CLASS="rdoc"
>defines how nonempty constructor applications are
 folded.  It takes the folded tail of the constructor
 application and its head, i.e., an immediate subterm,
 and combines them in some way.
</TD
></TR
><TR
><TD CLASS="arg"
>-&gt; <SPAN CLASS="keyword"
>forall</SPAN
> g.  g -&gt; c g</TD
><TD CLASS="rdoc"
>defines how the empty constructor application is
 folded, like the neutral / start element for list
 folding.
</TD
></TR
><TR
><TD CLASS="arg"
>-&gt; a</TD
><TD CLASS="rdoc"
>structure to be folded.
</TD
></TR
><TR
><TD CLASS="arg"
>-&gt; c a</TD
><TD CLASS="rdoc"
>result, with a type defined in terms of <TT
>a</TT
>, but
 variability is achieved by means of type constructor
 <TT
>c</TT
> for the construction of the actual result type.
</TD
></TR
><TR
><TD CLASS="ndoc" COLSPAN="2"
><P
>Left-associative fold operation for constructor applications.
</P
><P
>The type of <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
> is a headache, but operationally it is a simple
 generalisation of a list fold.
</P
><P
>The default definition for <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
> is <TT
><TT
><A HREF="Prelude.html#v%3Aconst"
>const</A
></TT
> <TT
><A HREF="Prelude.html#v%3Aid"
>id</A
></TT
></TT
>, which is
 suitable for abstract datatypes with no substructures.
</P
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:gunfold"
><A NAME="v%3Agunfold"
></A
></A
><B
>gunfold</B
> ::  (<SPAN CLASS="keyword"
>forall</SPAN
> b r. <A HREF="Data-Data.html#t%3AData"
>Data</A
> b =&gt; c (b -&gt; r) -&gt; c r) -&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> r.  r -&gt; c r) -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; c a</TD
></TR
><TR
><TD CLASS="doc"
>Unfolding constructor applications
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:toConstr"
><A NAME="v%3AtoConstr"
></A
></A
><B
>toConstr</B
> :: a -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="doc"
>Obtaining the constructor from a given datum.
 For proper terms, this is meant to be the top-level constructor.
 Primitive datatypes are here viewed as potentially infinite sets of
 values (i.e., constructors).
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:dataTypeOf"
><A NAME="v%3AdataTypeOf"
></A
></A
><B
>dataTypeOf</B
> :: a -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="doc"
>The outer type constructor of the type
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:dataCast1"
><A NAME="v%3AdataCast1"
></A
></A
><B
>dataCast1</B
> :: <A HREF="Data-Typeable.html#t%3ATypeable1"
>Typeable1</A
> t =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; c (t d)) -&gt; <A HREF="Data-Maybe.html#t%3AMaybe"
>Maybe</A
> (c a)</TD
></TR
><TR
><TD CLASS="doc"
><P
>Mediate types and unary type constructors.
 In <TT
><A HREF="Data-Data.html#t%3AData"
>Data</A
></TT
> instances of the form <TT
>T a</TT
>, <TT
><A HREF="Data-Data.html#v%3AdataCast1"
>dataCast1</A
></TT
> should be defined
 as <TT
><A HREF="Data-Typeable.html#v%3Agcast1"
>gcast1</A
></TT
>.
</P
><P
>The default definition is <TT
><TT
><A HREF="Prelude.html#v%3Aconst"
>const</A
></TT
> <TT
><A HREF="Data-Maybe.html#v%3ANothing"
>Nothing</A
></TT
></TT
>, which is appropriate
 for non-unary type constructors.
</P
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:dataCast2"
><A NAME="v%3AdataCast2"
></A
></A
><B
>dataCast2</B
> :: <A HREF="Data-Typeable.html#t%3ATypeable2"
>Typeable2</A
> t =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d e. (<A HREF="Data-Data.html#t%3AData"
>Data</A
> d, <A HREF="Data-Data.html#t%3AData"
>Data</A
> e) =&gt; c (t d e)) -&gt; <A HREF="Data-Maybe.html#t%3AMaybe"
>Maybe</A
> (c a)</TD
></TR
><TR
><TD CLASS="doc"
><P
>Mediate types and binary type constructors.
 In <TT
><A HREF="Data-Data.html#t%3AData"
>Data</A
></TT
> instances of the form <TT
>T a b</TT
>, <TT
><A HREF="Data-Data.html#v%3AdataCast2"
>dataCast2</A
></TT
> should be
 defined as <TT
><A HREF="Data-Typeable.html#v%3Agcast2"
>gcast2</A
></TT
>.
</P
><P
>The default definition is <TT
><TT
><A HREF="Prelude.html#v%3Aconst"
>const</A
></TT
> <TT
><A HREF="Data-Maybe.html#v%3ANothing"
>Nothing</A
></TT
></TT
>, which is appropriate
 for non-binary type constructors.
</P
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:gmapT"
><A NAME="v%3AgmapT"
></A
></A
><B
>gmapT</B
> :: (<SPAN CLASS="keyword"
>forall</SPAN
> b. <A HREF="Data-Data.html#t%3AData"
>Data</A
> b =&gt; b -&gt; b) -&gt; a -&gt; a</TD
></TR
><TR
><TD CLASS="doc"
><P
>A generic transformation that maps over the immediate subterms
</P
><P
>The default definition instantiates the type constructor <TT
>c</TT
> in the
 type of <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
> to an identity datatype constructor, using the
 isomorphism pair as injection and projection.
</P
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:gmapQl"
><A NAME="v%3AgmapQl"
></A
></A
><B
>gmapQl</B
> ::  (r -&gt; r' -&gt; r) -&gt; r -&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; r') -&gt; a -&gt; r</TD
></TR
><TR
><TD CLASS="doc"
>A generic query with a left-associative binary operator
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:gmapQr"
><A NAME="v%3AgmapQr"
></A
></A
><B
>gmapQr</B
> ::  (r' -&gt; r -&gt; r) -&gt; r -&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; r') -&gt; a -&gt; r</TD
></TR
><TR
><TD CLASS="doc"
>A generic query with a right-associative binary operator
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:gmapQ"
><A NAME="v%3AgmapQ"
></A
></A
><B
>gmapQ</B
> ::  (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; u) -&gt; a -&gt; [u]</TD
></TR
><TR
><TD CLASS="doc"
>A generic query that processes the immediate subterms and returns a list
 of results.  The list is given in the same order as originally specified
 in the declaratoin of the data constructors.
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:gmapQi"
><A NAME="v%3AgmapQi"
></A
></A
><B
>gmapQi</B
> ::  <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; u) -&gt; a -&gt; u</TD
></TR
><TR
><TD CLASS="doc"
>A generic query that processes one child by index (zero-based)
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:gmapM"
><A NAME="v%3AgmapM"
></A
></A
><B
>gmapM</B
> :: <A HREF="Control-Monad.html#t%3AMonad"
>Monad</A
> m =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; m d) -&gt; a -&gt; m a</TD
></TR
><TR
><TD CLASS="doc"
><P
>A generic monadic transformation that maps over the immediate subterms
</P
><P
>The default definition instantiates the type constructor <TT
>c</TT
> in
 the type of <TT
><A HREF="Data-Data.html#v%3Agfoldl"
>gfoldl</A
></TT
> to the monad datatype constructor, defining
 injection and projection using <TT
><A HREF="Control-Monad.html#v%3Areturn"
>return</A
></TT
> and <TT
><A HREF="Control-Monad.html#v%3A%3E%3E%3D"
>&gt;&gt;=</A
></TT
>.
</P
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:gmapMp"
><A NAME="v%3AgmapMp"
></A
></A
><B
>gmapMp</B
> :: <A HREF="Control-Monad.html#t%3AMonadPlus"
>MonadPlus</A
> m =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; m d) -&gt; a -&gt; m a</TD
></TR
><TR
><TD CLASS="doc"
>Transformation of at least one immediate subterm does not fail
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:gmapMo"
><A NAME="v%3AgmapMo"
></A
></A
><B
>gmapMo</B
> :: <A HREF="Control-Monad.html#t%3AMonadPlus"
>MonadPlus</A
> m =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d -&gt; m d) -&gt; a -&gt; m a</TD
></TR
><TR
><TD CLASS="doc"
>Transformation of one immediate subterm with success
</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:Data')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:Data" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="../ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="../ghc-prim/GHC-Types.html#t%3AChar"
>Char</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="../ghc-prim/GHC-Types.html#t%3ADouble"
>Double</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="../ghc-prim/GHC-Types.html#t%3AFloat"
>Float</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="Data-Int.html#t%3AInt8"
>Int8</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="Data-Int.html#t%3AInt16"
>Int16</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="Data-Int.html#t%3AInt32"
>Int32</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="Data-Int.html#t%3AInt64"
>Int64</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="../integer/GHC-Integer.html#t%3AInteger"
>Integer</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="../ghc-prim/GHC-Ordering.html#t%3AOrdering"
>Ordering</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="Data-Word.html#t%3AWord"
>Word</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="Data-Word.html#t%3AWord8"
>Word8</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="Data-Word.html#t%3AWord16"
>Word16</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="Data-Word.html#t%3AWord32"
>Word32</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="Data-Word.html#t%3AWord64"
>Word64</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> a =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> ([] a)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Data-Data.html#t%3AData"
>Data</A
> a, <A HREF="Prelude.html#t%3AIntegral"
>Integral</A
> a) =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="Data-Ratio.html#t%3ARatio"
>Ratio</A
> a)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Typeable.html#t%3ATypeable"
>Typeable</A
> a =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="Foreign-Ptr.html#t%3APtr"
>Ptr</A
> a)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Data.html#t%3AData"
>Data</A
> a =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Typeable.html#t%3ATypeable"
>Typeable</A
> a =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="Foreign-ForeignPtr.html#t%3AForeignPtr"
>ForeignPtr</A
> a)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Data-Data.html#t%3AData"
>Data</A
> a, <A HREF="Prelude.html#t%3ARealFloat"
>RealFloat</A
> a) =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="Data-Complex.html#t%3AComplex"
>Complex</A
> a)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Data-Data.html#t%3AData"
>Data</A
> a, <A HREF="Data-Data.html#t%3AData"
>Data</A
> b) =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="Data-Either.html#t%3AEither"
>Either</A
> a b)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Data-Data.html#t%3AData"
>Data</A
> a, <A HREF="Data-Data.html#t%3AData"
>Data</A
> b) =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="../ghc-prim/GHC-Tuple.html#t%3A%28%2C%29"
>(,)</A
> a b)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Data-Typeable.html#t%3ATypeable"
>Typeable</A
> a, <A HREF="Data-Data.html#t%3AData"
>Data</A
> b, <A HREF="GHC-Arr.html#t%3AIx"
>Ix</A
> a) =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="GHC-Arr.html#t%3AArray"
>Array</A
> a b)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Data-Data.html#t%3AData"
>Data</A
> a, <A HREF="Data-Data.html#t%3AData"
>Data</A
> b, <A HREF="Data-Data.html#t%3AData"
>Data</A
> c) =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="../ghc-prim/GHC-Tuple.html#t%3A%28%2C%2C%29"
>(,,)</A
> a b c)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Data-Data.html#t%3AData"
>Data</A
> a, <A HREF="Data-Data.html#t%3AData"
>Data</A
> b, <A HREF="Data-Data.html#t%3AData"
>Data</A
> c, <A HREF="Data-Data.html#t%3AData"
>Data</A
> d) =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="../ghc-prim/GHC-Tuple.html#t%3A%28%2C%2C%2C%29"
>(,,,)</A
> a b c d)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Data-Data.html#t%3AData"
>Data</A
> a, <A HREF="Data-Data.html#t%3AData"
>Data</A
> b, <A HREF="Data-Data.html#t%3AData"
>Data</A
> c, <A HREF="Data-Data.html#t%3AData"
>Data</A
> d, <A HREF="Data-Data.html#t%3AData"
>Data</A
> e) =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="../ghc-prim/GHC-Tuple.html#t%3A%28%2C%2C%2C%2C%29"
>(,,,,)</A
> a b c d e)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Data-Data.html#t%3AData"
>Data</A
> a, <A HREF="Data-Data.html#t%3AData"
>Data</A
> b, <A HREF="Data-Data.html#t%3AData"
>Data</A
> c, <A HREF="Data-Data.html#t%3AData"
>Data</A
> d, <A HREF="Data-Data.html#t%3AData"
>Data</A
> e, <A HREF="Data-Data.html#t%3AData"
>Data</A
> f) =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="../ghc-prim/GHC-Tuple.html#t%3A%28%2C%2C%2C%2C%2C%29"
>(,,,,,)</A
> a b c d e f)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Data-Data.html#t%3AData"
>Data</A
> a, <A HREF="Data-Data.html#t%3AData"
>Data</A
> b, <A HREF="Data-Data.html#t%3AData"
>Data</A
> c, <A HREF="Data-Data.html#t%3AData"
>Data</A
> d, <A HREF="Data-Data.html#t%3AData"
>Data</A
> e, <A HREF="Data-Data.html#t%3AData"
>Data</A
> f, <A HREF="Data-Data.html#t%3AData"
>Data</A
> g) =&gt; <A HREF="Data-Data.html#t%3AData"
>Data</A
> (<A HREF="../ghc-prim/GHC-Tuple.html#t%3A%28%2C%2C%2C%2C%2C%2C%29"
>(,,,,,,)</A
> a b c d e f g)</TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="3"
><A NAME="3"
>Datatype representations
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:DataType"
><A NAME="t%3ADataType"
></A
></A
><B
>DataType</B
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
>Representation of datatypes.
 A package of constructor representations with names of type and module.
</TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:DataType')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:DataType" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Text-Show.html#t%3AShow"
>Show</A
> <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section2"
><A NAME="4"
><A NAME="4"
>Constructors
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mkDataType"
><A NAME="v%3AmkDataType"
></A
></A
><B
>mkDataType</B
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; [<A HREF="Data-Data.html#t%3AConstr"
>Constr</A
>] -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="doc"
>Constructs an algebraic datatype
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mkIntType"
><A NAME="v%3AmkIntType"
></A
></A
><B
>mkIntType</B
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="doc"
>Constructs the <TT
><A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
></TT
> type
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mkFloatType"
><A NAME="v%3AmkFloatType"
></A
></A
><B
>mkFloatType</B
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="doc"
>Constructs the <TT
><A HREF="../ghc-prim/GHC-Types.html#t%3AFloat"
>Float</A
></TT
> type
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mkStringType"
><A NAME="v%3AmkStringType"
></A
></A
><B
>mkStringType</B
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="doc"
>Constructs the <TT
><A HREF="Data-Char.html#t%3AString"
>String</A
></TT
> type
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mkNorepType"
><A NAME="v%3AmkNorepType"
></A
></A
><B
>mkNorepType</B
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="doc"
>Constructs a non-representation for a non-presentable type
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section2"
><A NAME="5"
><A NAME="5"
>Observers
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:dataTypeName"
><A NAME="v%3AdataTypeName"
></A
></A
><B
>dataTypeName</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the type constructor including the module
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:DataRep"
><A NAME="t%3ADataRep"
></A
></A
><B
>DataRep</B
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
>Public representation of datatypes
</TD
></TR
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:AlgRep"
><A NAME="v%3AAlgRep"
></A
></A
><B
>AlgRep</B
> [<A HREF="Data-Data.html#t%3AConstr"
>Constr</A
>]</TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:IntRep"
><A NAME="v%3AIntRep"
></A
></A
><B
>IntRep</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:FloatRep"
><A NAME="v%3AFloatRep"
></A
></A
><B
>FloatRep</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:StringRep"
><A NAME="v%3AStringRep"
></A
></A
><B
>StringRep</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:NoRep"
><A NAME="v%3ANoRep"
></A
></A
><B
>NoRep</B
></TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:DataRep')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:DataRep" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Data-Eq.html#t%3AEq"
>Eq</A
> <A HREF="Data-Data.html#t%3ADataRep"
>DataRep</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Text-Show.html#t%3AShow"
>Show</A
> <A HREF="Data-Data.html#t%3ADataRep"
>DataRep</A
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:dataTypeRep"
><A NAME="v%3AdataTypeRep"
></A
></A
><B
>dataTypeRep</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Data.html#t%3ADataRep"
>DataRep</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the public presentation of a datatype
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section2"
><A NAME="6"
><A NAME="6"
>Convenience functions
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:repConstr"
><A NAME="v%3ArepConstr"
></A
></A
><B
>repConstr</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Data.html#t%3AConstrRep"
>ConstrRep</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="doc"
>Look up a constructor by its representation
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:isAlgType"
><A NAME="v%3AisAlgType"
></A
></A
><B
>isAlgType</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="../ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
></TD
></TR
><TR
><TD CLASS="doc"
>Test for an algebraic type
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:dataTypeConstrs"
><A NAME="v%3AdataTypeConstrs"
></A
></A
><B
>dataTypeConstrs</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; [<A HREF="Data-Data.html#t%3AConstr"
>Constr</A
>]</TD
></TR
><TR
><TD CLASS="doc"
>Gets the constructors of an algebraic datatype
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:indexConstr"
><A NAME="v%3AindexConstr"
></A
></A
><B
>indexConstr</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Data.html#t%3AConIndex"
>ConIndex</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the constructor for an index (algebraic datatypes only)
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:maxConstrIndex"
><A NAME="v%3AmaxConstrIndex"
></A
></A
><B
>maxConstrIndex</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Data.html#t%3AConIndex"
>ConIndex</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the maximum constructor index of an algebraic datatype
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:isNorepType"
><A NAME="v%3AisNorepType"
></A
></A
><B
>isNorepType</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="../ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
></TD
></TR
><TR
><TD CLASS="doc"
>Test for a non-representable type
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="7"
><A NAME="7"
>Data constructor representations
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:Constr"
><A NAME="t%3AConstr"
></A
></A
><B
>Constr</B
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
>Representation of constructors
</TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:Constr')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:Constr" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Data-Eq.html#t%3AEq"
>Eq</A
> <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Text-Show.html#t%3AShow"
>Show</A
> <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>type</SPAN
> <A NAME="t:ConIndex"
><A NAME="t%3AConIndex"
></A
></A
><B
>ConIndex</B
> = <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
></TD
></TR
><TR
><TD CLASS="doc"
>Unique index for datatype constructors,
 counting from 1 in the order they are given in the program text.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:Fixity"
><A NAME="t%3AFixity"
></A
></A
><B
>Fixity</B
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
>Fixity of constructors
</TD
></TR
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:Prefix"
><A NAME="v%3APrefix"
></A
></A
><B
>Prefix</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:Infix"
><A NAME="v%3AInfix"
></A
></A
><B
>Infix</B
></TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:Fixity')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:Fixity" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Data-Eq.html#t%3AEq"
>Eq</A
> <A HREF="Data-Data.html#t%3AFixity"
>Fixity</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Text-Show.html#t%3AShow"
>Show</A
> <A HREF="Data-Data.html#t%3AFixity"
>Fixity</A
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section2"
><A NAME="8"
><A NAME="8"
>Constructors
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mkConstr"
><A NAME="v%3AmkConstr"
></A
></A
><B
>mkConstr</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; [<A HREF="Data-Char.html#t%3AString"
>String</A
>] -&gt; <A HREF="Data-Data.html#t%3AFixity"
>Fixity</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="doc"
>Constructs a constructor
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mkIntConstr"
><A NAME="v%3AmkIntConstr"
></A
></A
><B
>mkIntConstr</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="../integer/GHC-Integer.html#t%3AInteger"
>Integer</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mkFloatConstr"
><A NAME="v%3AmkFloatConstr"
></A
></A
><B
>mkFloatConstr</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="../ghc-prim/GHC-Types.html#t%3ADouble"
>Double</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:mkStringConstr"
><A NAME="v%3AmkStringConstr"
></A
></A
><B
>mkStringConstr</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section2"
><A NAME="9"
><A NAME="9"
>Observers
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:constrType"
><A NAME="v%3AconstrType"
></A
></A
><B
>constrType</B
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the datatype of a constructor
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:ConstrRep"
><A NAME="t%3AConstrRep"
></A
></A
><B
>ConstrRep</B
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
>Public representation of constructors
</TD
></TR
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:AlgConstr"
><A NAME="v%3AAlgConstr"
></A
></A
><B
>AlgConstr</B
> <A HREF="Data-Data.html#t%3AConIndex"
>ConIndex</A
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:IntConstr"
><A NAME="v%3AIntConstr"
></A
></A
><B
>IntConstr</B
> <A HREF="../integer/GHC-Integer.html#t%3AInteger"
>Integer</A
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:FloatConstr"
><A NAME="v%3AFloatConstr"
></A
></A
><B
>FloatConstr</B
> <A HREF="../ghc-prim/GHC-Types.html#t%3ADouble"
>Double</A
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:StringConstr"
><A NAME="v%3AStringConstr"
></A
></A
><B
>StringConstr</B
> <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:ConstrRep')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:ConstrRep" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Data-Eq.html#t%3AEq"
>Eq</A
> <A HREF="Data-Data.html#t%3AConstrRep"
>ConstrRep</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Text-Show.html#t%3AShow"
>Show</A
> <A HREF="Data-Data.html#t%3AConstrRep"
>ConstrRep</A
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:constrRep"
><A NAME="v%3AconstrRep"
></A
></A
><B
>constrRep</B
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; <A HREF="Data-Data.html#t%3AConstrRep"
>ConstrRep</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the public presentation of constructors
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:constrFields"
><A NAME="v%3AconstrFields"
></A
></A
><B
>constrFields</B
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; [<A HREF="Data-Char.html#t%3AString"
>String</A
>]</TD
></TR
><TR
><TD CLASS="doc"
>Gets the field labels of a constructor.  The list of labels
 is returned in the same order as they were given in the original 
 constructor declaration.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:constrFixity"
><A NAME="v%3AconstrFixity"
></A
></A
><B
>constrFixity</B
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; <A HREF="Data-Data.html#t%3AFixity"
>Fixity</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the fixity of a constructor
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section2"
><A NAME="10"
><A NAME="10"
>Convenience function: algebraic data types
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:constrIndex"
><A NAME="v%3AconstrIndex"
></A
></A
><B
>constrIndex</B
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; <A HREF="Data-Data.html#t%3AConIndex"
>ConIndex</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the index of a constructor (algebraic datatypes only)
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section2"
><A NAME="11"
><A NAME="11"
>From strings to constructors and vice versa: all data types
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:showConstr"
><A NAME="v%3AshowConstr"
></A
></A
><B
>showConstr</B
> :: <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the string for a constructor
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:readConstr"
><A NAME="v%3AreadConstr"
></A
></A
><B
>readConstr</B
> :: <A HREF="Data-Data.html#t%3ADataType"
>DataType</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Maybe.html#t%3AMaybe"
>Maybe</A
> <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
></TD
></TR
><TR
><TD CLASS="doc"
>Lookup a constructor via a string
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="12"
><A NAME="12"
>Convenience functions: take type constructors apart
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:tyconUQname"
><A NAME="v%3AtyconUQname"
></A
></A
><B
>tyconUQname</B
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the unqualified type constructor:
 drop *.*.*... before name
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:tyconModule"
><A NAME="v%3AtyconModule"
></A
></A
><B
>tyconModule</B
> :: <A HREF="Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
>Gets the module of a type constructor:
 take *.*.*... before name
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="13"
><A NAME="13"
>Generic operations defined in terms of <TT
><A HREF="Data-Data.html#v%3Agunfold"
>gunfold</A
></TT
>
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:fromConstr"
><A NAME="v%3AfromConstr"
></A
></A
><B
>fromConstr</B
> :: <A HREF="Data-Data.html#t%3AData"
>Data</A
> a =&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; a</TD
></TR
><TR
><TD CLASS="doc"
>Build a term skeleton
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:fromConstrB"
><A NAME="v%3AfromConstrB"
></A
></A
><B
>fromConstrB</B
> :: <A HREF="Data-Data.html#t%3AData"
>Data</A
> a =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; d) -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; a</TD
></TR
><TR
><TD CLASS="doc"
>Build a term and use a generic function for subterms
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:fromConstrM"
><A NAME="v%3AfromConstrM"
></A
></A
><B
>fromConstrM</B
> :: (<A HREF="Control-Monad.html#t%3AMonad"
>Monad</A
> m, <A HREF="Data-Data.html#t%3AData"
>Data</A
> a) =&gt; (<SPAN CLASS="keyword"
>forall</SPAN
> d. <A HREF="Data-Data.html#t%3AData"
>Data</A
> d =&gt; m d) -&gt; <A HREF="Data-Data.html#t%3AConstr"
>Constr</A
> -&gt; m a</TD
></TR
><TR
><TD CLASS="doc"
>Monadic variation on <TT
><A HREF="Data-Data.html#v%3AfromConstrB"
>fromConstrB</A
></TT
>
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="botbar"
>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
> version 2.4.2</TD
></TR
></TABLE
></BODY
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