<!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 >Data.Unique</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_Data-Unique.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" >base-4.1.0.0: Basic libraries</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" >Data.Unique</FONT ></TD ><TD ALIGN="right" ><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="infohead" >Portability</TD ><TD CLASS="infoval" >non-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 ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="section4" ><B >Contents</B ></TD ></TR ><TR ><TD ><DL ><DT ><A HREF="#1" >Unique objects </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" >An abstract interface to a unique symbol generator. </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" ><SPAN CLASS="keyword" >data</SPAN > <A HREF="#t%3AUnique" >Unique</A > </TD ></TR ><TR ><TD CLASS="s8" ></TD ></TR ><TR ><TD CLASS="decl" ><A HREF="#v%3AnewUnique" >newUnique</A > :: <A HREF="System-IO.html#t%3AIO" >IO</A > <A HREF="Data-Unique.html#t%3AUnique" >Unique</A ></TD ></TR ><TR ><TD CLASS="s8" ></TD ></TR ><TR ><TD CLASS="decl" ><A HREF="#v%3AhashUnique" >hashUnique</A > :: <A HREF="Data-Unique.html#t%3AUnique" >Unique</A > -> <A HREF="../ghc-prim/GHC-Types.html#t%3AInt" >Int</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" >Unique objects </A ></A ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="decl" ><SPAN CLASS="keyword" >data</SPAN > <A NAME="t:Unique" ><A NAME="t%3AUnique" ></A ></A ><B >Unique</B > </TD ></TR ><TR ><TD CLASS="body" ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="ndoc" >An abstract unique object. Objects of type <TT ><A HREF="Data-Unique.html#t%3AUnique" >Unique</A ></TT > may be compared for equality and ordering and hashed into <TT ><A HREF="../ghc-prim/GHC-Types.html#t%3AInt" >Int</A ></TT >. </TD ></TR ><TR ><TD CLASS="section4" ><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:Unique')" ALT="show/hide" > Instances</TD ></TR ><TR ><TD CLASS="body" ><DIV ID="i:Unique" 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-Unique.html#t%3AUnique" >Unique</A ></TD ></TR ><TR ><TD CLASS="decl" ><A HREF="Data-Ord.html#t%3AOrd" >Ord</A > <A HREF="Data-Unique.html#t%3AUnique" >Unique</A ></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="decl" ><A NAME="v:newUnique" ><A NAME="v%3AnewUnique" ></A ></A ><B >newUnique</B > :: <A HREF="System-IO.html#t%3AIO" >IO</A > <A HREF="Data-Unique.html#t%3AUnique" >Unique</A ></TD ></TR ><TR ><TD CLASS="doc" >Creates a new object of type <TT ><A HREF="Data-Unique.html#t%3AUnique" >Unique</A ></TT >. The value returned will not compare equal to any other value of type <TT ><A HREF="Data-Unique.html#t%3AUnique" >Unique</A ></TT > returned by previous calls to <TT ><A HREF="Data-Unique.html#v%3AnewUnique" >newUnique</A ></TT >. There is no limit on the number of times <TT ><A HREF="Data-Unique.html#v%3AnewUnique" >newUnique</A ></TT > may be called. </TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="decl" ><A NAME="v:hashUnique" ><A NAME="v%3AhashUnique" ></A ></A ><B >hashUnique</B > :: <A HREF="Data-Unique.html#t%3AUnique" >Unique</A > -> <A HREF="../ghc-prim/GHC-Types.html#t%3AInt" >Int</A ></TD ></TR ><TR ><TD CLASS="doc" >Hashes a <TT ><A HREF="Data-Unique.html#t%3AUnique" >Unique</A ></TT > into an <TT ><A HREF="../ghc-prim/GHC-Types.html#t%3AInt" >Int</A ></TT >. Two <TT ><A HREF="Data-Unique.html#t%3AUnique" >Unique</A ></TT >s may hash to the same value, although in practice this is unlikely. The <TT ><A HREF="../ghc-prim/GHC-Types.html#t%3AInt" >Int</A ></TT > returned makes a good hash key. </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 ></HTML >