Sophie: ghc-ForSyDe-devel-3.1.1-4.fc14 i686

ghc-ForSyDe-devel-3.1.1-4.fc14.i686.rpm

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>ForSyDe.AbsentExt</TITLE
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>ForSyDe-3.1.1: ForSyDe's Haskell-embedded Domain Specific Language.</TD
><TD CLASS="topbut"
><A HREF="src/ForSyDe-AbsentExt.html"
>Source code</A
></TD
><TD CLASS="topbut"
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>Contents</A
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>Index</A
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><TD CLASS="modulebar"
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><FONT SIZE="6"
>ForSyDe.AbsentExt</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"
>forsyde-dev@ict.kth.se</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"
>The <TT
><A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
></TT
> is used to extend existing data types with the value
  'absent', which models the absence of a value.
</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"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3AAbstExt"
>AbstExt</A
> a </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
>= <A HREF="#v%3AAbst"
>Abst</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3APrst"
>Prst</A
> a</TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AfromAbstExt"
>fromAbstExt</A
> ::  a -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AunsafeFromAbstExt"
>unsafeFromAbstExt</A
> ::  <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AabstExt"
>abstExt</A
> ::  a -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Apsi"
>psi</A
> ::  (a -&gt; b) -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> b</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AisAbsent"
>isAbsent</A
> ::  <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Data-Bool.html#t%3ABool"
>Bool</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AisPresent"
>isPresent</A
> ::  <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Data-Bool.html#t%3ABool"
>Bool</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AabstExtFunc"
>abstExtFunc</A
> ::  (a -&gt; b) -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> b</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Documentation</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:AbstExt"
><A NAME="t%3AAbstExt"
></A
></A
><B
>AbstExt</B
> a </TD
><TD CLASS="declbut"
><A HREF="src/ForSyDe-AbsentExt.html#AbstExt"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
>The data type <TT
><A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
></TT
> has two constructors. The constructor <TT
><A HREF="ForSyDe-AbsentExt.html#v%3AAbst"
>Abst</A
></TT
> is used to model the absence of a value, while the constructor <TT
><A HREF="ForSyDe-AbsentExt.html#v%3APrst"
>Prst</A
></TT
> is used to model present values.
</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:Abst"
><A NAME="v%3AAbst"
></A
></A
><B
>Abst</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:Prst"
><A NAME="v%3APrst"
></A
></A
><B
>Prst</B
> a</TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:AbstExt')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:AbstExt" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Data-Typeable.html#t%3ATypeable1"
>Typeable1</A
> <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Data-Eq.html#t%3AEq"
>Eq</A
> a =&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Data-Eq.html#t%3AEq"
>Eq</A
> (<A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Data-Data.html#t%3AData"
>Data</A
> a =&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Data-Data.html#t%3AData"
>Data</A
> (<A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Text-Read.html#t%3ARead"
>Read</A
> a =&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Text-Read.html#t%3ARead"
>Read</A
> (<A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Text-Show.html#t%3AShow"
>Show</A
> a =&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Text-Show.html#t%3AShow"
>Show</A
> (<A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="/usr/share/doc/ghc/html/libraries/template-haskell-2.4.0.1/Language-Haskell-TH-Syntax.html#t%3ALift"
>Lift</A
> a[a8cqh] =&gt; <A HREF="/usr/share/doc/ghc/html/libraries/template-haskell-2.4.0.1/Language-Haskell-TH-Syntax.html#t%3ALift"
>Lift</A
> (<A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a[a8cqh])</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="ForSyDe-Process.html#t%3AProcType"
>ProcType</A
> a =&gt; <A HREF="ForSyDe-Process.html#t%3AProcType"
>ProcType</A
> (<A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a)</TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:fromAbstExt"
><A NAME="v%3AfromAbstExt"
></A
></A
><B
>fromAbstExt</B
></TD
><TD CLASS="declbut"
><A HREF="src/ForSyDe-AbsentExt.html#fromAbstExt"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="arg"
>:: a</TD
><TD CLASS="rdoc"
>Default value returned if the input is <TT
><A HREF="ForSyDe-AbsentExt.html#v%3AAbst"
>Abst</A
></TT
> 
</TD
></TR
><TR
><TD CLASS="arg"
>-&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a</TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
>-&gt; a</TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="ndoc" COLSPAN="2"
>The function <TT
><A HREF="ForSyDe-AbsentExt.html#v%3AfromAbstExt"
>fromAbstExt</A
></TT
> extracts the inner value contained in <TT
><A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
></TT
>
</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:unsafeFromAbstExt"
><A NAME="v%3AunsafeFromAbstExt"
></A
></A
><B
>unsafeFromAbstExt</B
> ::  <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; a</TD
><TD CLASS="declbut"
><A HREF="src/ForSyDe-AbsentExt.html#unsafeFromAbstExt"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>Similar to <TT
><A HREF="ForSyDe-AbsentExt.html#v%3AfromAbstExt"
>fromAbstExt</A
></TT
>, but without default value
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:abstExt"
><A NAME="v%3AabstExt"
></A
></A
><B
>abstExt</B
> ::  a -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a</TD
><TD CLASS="declbut"
><A HREF="src/ForSyDe-AbsentExt.html#abstExt"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>The function <TT
><A HREF="ForSyDe-AbsentExt.html#v%3AabstExt"
>abstExt</A
></TT
> converts a usual value to a present value. 
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:psi"
><A NAME="v%3Apsi"
></A
></A
><B
>psi</B
> ::  (a -&gt; b) -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> b</TD
><TD CLASS="declbut"
><A HREF="src/ForSyDe-AbsentExt.html#psi"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>The function <TT
><A HREF="ForSyDe-AbsentExt.html#v%3Apsi"
>psi</A
></TT
> is identical to <TT
><A HREF="ForSyDe-AbsentExt.html#v%3AabstExtFunc"
>abstExtFunc</A
></TT
> and should be used in future.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:isAbsent"
><A NAME="v%3AisAbsent"
></A
></A
><B
>isAbsent</B
> ::  <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Data-Bool.html#t%3ABool"
>Bool</A
></TD
><TD CLASS="declbut"
><A HREF="src/ForSyDe-AbsentExt.html#isAbsent"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>The functions <TT
><A HREF="ForSyDe-AbsentExt.html#v%3AisAbsent"
>isAbsent</A
></TT
> checks for the absence of a value.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:isPresent"
><A NAME="v%3AisPresent"
></A
></A
><B
>isPresent</B
> ::  <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/Data-Bool.html#t%3ABool"
>Bool</A
></TD
><TD CLASS="declbut"
><A HREF="src/ForSyDe-AbsentExt.html#isPresent"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>The functions <TT
><A HREF="ForSyDe-AbsentExt.html#v%3AisPresent"
>isPresent</A
></TT
> checks for the presence of a value.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="topdecl"
><TABLE CLASS="declbar"
><TR
><TD CLASS="declname"
><A NAME="v:abstExtFunc"
><A NAME="v%3AabstExtFunc"
></A
></A
><B
>abstExtFunc</B
> ::  (a -&gt; b) -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> a -&gt; <A HREF="ForSyDe-AbsentExt.html#t%3AAbstExt"
>AbstExt</A
> b</TD
><TD CLASS="declbut"
><A HREF="src/ForSyDe-AbsentExt.html#abstExtFunc"
>Source</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="doc"
>The function <TT
><A HREF="ForSyDe-AbsentExt.html#v%3AabstExtFunc"
>abstExtFunc</A
></TT
> extends a function in order to process absent extended values. If the input is (&quot;bottom&quot;), the output will also be  (&quot;bottom&quot;).
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="botbar"
>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
> version 2.6.1</TD
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