<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta name="robots" content="index,nofollow">
<title>MLtonIntInf - MLton Standard ML Compiler (SML Compiler)</title>
<link rel="stylesheet" type="text/css" charset="iso-8859-1" media="all" href="common.css">
<link rel="stylesheet" type="text/css" charset="iso-8859-1" media="screen" href="screen.css">
<link rel="stylesheet" type="text/css" charset="iso-8859-1" media="print" href="print.css">
<link rel="Start" href="Home">
</head>
<body lang="en" dir="ltr">
<script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
</script>
<script type="text/javascript">
_uacct = "UA-833377-1";
urchinTracker();
</script>
<table bgcolor = lightblue cellspacing = 0 style = "border: 0px;" width = 100%>
<tr>
<td style = "
border: 0px;
color: darkblue;
font-size: 150%;
text-align: left;">
<a class = mltona href="Home">MLton MLTONWIKIVERSION</a>
<td style = "
border: 0px;
font-size: 150%;
text-align: center;
width: 50%;">
MLtonIntInf
<td style = "
border: 0px;
text-align: right;">
<table cellspacing = 0 style = "border: 0px">
<tr style = "vertical-align: middle;">
</table>
<tr style = "background-color: white;">
<td colspan = 3
style = "
border: 0px;
font-size:70%;
text-align: right;">
<a href = "Home">Home</a>
<a href = "TitleIndex">Index</a>
</table>
<div id="content" lang="en" dir="ltr">
<pre class=code>
<B><FONT COLOR="#0000FF">signature</FONT></B> MLTON_INT_INF =
<B><FONT COLOR="#0000FF">sig</FONT></B>
<B><FONT COLOR="#A020F0">type</FONT></B><B><FONT COLOR="#228B22"> t </FONT></B>=<B><FONT COLOR="#228B22"> IntInf.int
</FONT></B><B><FONT COLOR="#A020F0">val</FONT></B> areSmall: t * t -> bool
<B><FONT COLOR="#A020F0">val</FONT></B> gcd: t * t -> t
<B><FONT COLOR="#A020F0">val</FONT></B> isSmall: t -> bool
<B><FONT COLOR="#0000FF">structure</FONT></B> BigWord : WORD
<B><FONT COLOR="#0000FF">structure</FONT></B> SmallInt : INTEGER
<B><FONT COLOR="#A020F0">datatype</FONT></B><B><FONT COLOR="#228B22"> rep </FONT></B>=<B><FONT COLOR="#228B22">
<FONT COLOR="#B8860B">Big</FONT> <B><FONT COLOR="#A020F0">of</FONT></B> BigWord.word vector
</FONT></B>|<B><FONT COLOR="#228B22"> <FONT COLOR="#B8860B">Small</FONT> <B><FONT COLOR="#A020F0">of</FONT></B> SmallInt.int
</FONT></B><B><FONT COLOR="#A020F0">val</FONT></B> rep: t -> rep
<B><FONT COLOR="#A020F0">val</FONT></B> fromRep : rep -> t
<B><FONT COLOR="#0000FF">end</FONT></B>
</PRE>
<p>
</p>
<p>
MLton represents an arbitrary precision integer either as an unboxed word with the bottom bit set to 1 and the top bits representing a small signed integer, or as a pointer to a vector of words, where the first word indicates the sign and the rest are the limbs of a <a href="GnuMP">GnuMP</a> big integer.
</p>
<ul>
<li>
<p>
<tt>type t</tt> <br>
the same as type <tt>IntInf.int</tt>.
</p>
</li>
<li class="gap">
<p>
<tt>areSmall (a, b)</tt> <br>
returns true iff both <tt>a</tt> and <tt>b</tt> are small.
</p>
</li>
<li class="gap">
<p>
<tt>gcd (a, b)</tt> <br>
uses the <a href="GnuMP">GnuMP's</a> fast gcd implementation.
</p>
</li>
<li class="gap">
<p>
<tt>isSmall a</tt> <br>
returns true iff <tt>a</tt> is small.
</p>
</li>
<li class="gap">
<p>
<tt>BigWord : WORD</tt> <br>
representation of a big <tt>IntInf.int</tt> as a vector of words; on 32-bit platforms, <tt>BigWord</tt> is likely to be equivalent to <tt>Word32</tt>, and on 64-bit platforms, <tt>BigWord</tt> is likely to be equivalent to <tt>Word64</tt>.
</p>
</li>
<li class="gap">
<p>
<tt>SmallInt : INTEGER</tt> <br>
representation of a small <tt>IntInf.int</tt> as a signed integer; on 32-bit platforms, <tt>SmallInt</tt> is likely to be equivalent to <tt>Int32</tt>, and on 64-bit platforms, <tt>SmallInt</tt> is likely to be equivalent to <tt>Int64</tt>.
</p>
</li>
<li class="gap">
<p>
<tt>datatype rep</tt> <br>
the underlying representation of an <tt>IntInf.int</tt>.
</p>
</li>
<li class="gap">
<p>
<tt>rep i</tt> <br>
returns the underlying representation of <tt>i</tt>.
</p>
</li>
<li class="gap">
<p>
<tt>fromRep r</tt> <br>
converts from the underlying representation back to <tt>i</tt>. If the input is not identical to the result of <tt>rep</tt>, the result is undefined.
</p>
</li>
</ul>
</div>
<p>
<hr>
Last edited on 2009-09-11 15:13:38 by <span title="ottawa.dvs.informatik.tu-darmstadt.de"><a href="WesleyTerpstra">WesleyTerpstra</a></span>.
</body></html>
