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<title>MLtonIntInf - MLton Standard ML Compiler (SML Compiler)</title>
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<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 -&gt; bool
      <B><FONT COLOR="#A020F0">val</FONT></B> gcd: t * t -&gt; t
      <B><FONT COLOR="#A020F0">val</FONT></B> isSmall: t -&gt; 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 -&gt; rep
   <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&nbsp;t</tt>  <br>
the same as type <tt>IntInf.int</tt>. 
</p>
</li>
    <li class="gap">
<p>
 <tt>areSmall&nbsp;(a,&nbsp;b)</tt>  <br>
returns true iff both <tt>a</tt> and <tt>b</tt> are small. 
</p>
</li>
    <li class="gap">
<p>
 <tt>gcd&nbsp;(a,&nbsp;b)</tt>  <br>
uses the <a href="GnuMP">GnuMP's</a> fast gcd implementation. 
</p>
</li>
    <li class="gap">
<p>
 <tt>isSmall&nbsp;a</tt>  <br>
returns true iff <tt>a</tt> is small. 
</p>
</li>
    <li class="gap">
<p>
 <tt>BigWord&nbsp;:&nbsp;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&nbsp;:&nbsp;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&nbsp;rep</tt>  <br>
the underlying representation of an <tt>IntInf.int</tt>. 
</p>
</li>
    <li class="gap">
<p>
 <tt>rep&nbsp;i</tt>  <br>
returns the underlying representation of <tt>i</tt>. 
</p>
</li>
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<p>
<hr>
Last edited on 2007-08-23 13:54:34 by <span title="c-71-57-91-146.hsd1.il.comcast.net"><a href="MatthewFluet">MatthewFluet</a></span>.
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