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MLtonIntInf
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<pre class=code>
<B><FONT COLOR="#5F9EA0">signature</FONT></B> MLTON_INT_INF <B><FONT COLOR="#5F9EA0">=</FONT></B>
<B><FONT COLOR="#5F9EA0">sig</FONT></B>
<B><FONT COLOR="#A020F0">type</FONT></B> t
<B><FONT COLOR="#A020F0">val</FONT></B> areSmall: t <B><FONT COLOR="#5F9EA0">*</FONT></B> t <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> <B><FONT COLOR="#228B22">bool</FONT></B>
<B><FONT COLOR="#A020F0">val</FONT></B> gcd: t <B><FONT COLOR="#5F9EA0">*</FONT></B> t <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> t
<B><FONT COLOR="#A020F0">val</FONT></B> isSmall: t <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> <B><FONT COLOR="#228B22">bool</FONT></B>
<B><FONT COLOR="#A020F0">datatype</FONT></B> rep <B><FONT COLOR="#5F9EA0">=</FONT></B>
Big <B><FONT COLOR="#A020F0">of</FONT></B> <B><FONT COLOR="#228B22">word</FONT></B> <B><FONT COLOR="#228B22">vector</FONT></B>
<B><FONT COLOR="#5F9EA0">|</FONT></B> Small <B><FONT COLOR="#A020F0">of</FONT></B> <B><FONT COLOR="#228B22">int</FONT></B>
<B><FONT COLOR="#A020F0">val</FONT></B> rep: t <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> rep
<B><FONT COLOR="#A020F0">end</FONT></B>
</PRE>
<p>
</p>
<p>
MLton represents an arbitrary precision integer either as an unboxed 32 bit word with the bottom bit set to 1 and the top 31 bits representing a small integer in [-2<sup>30</sup>, 2<sup>30</sup>), or as a pointer to a vector of words where the first word indicates the sign and the rest are the limbs of <a href="GnuMP">GnuMP</a> big integer.
</p>
<ul>
<li>
<p>
<tt>type t</tt>
</p>
</li>
<ul>
the same as type <tt>IntInf.int</tt>.
</ul>
<li class="gap">
<p>
<tt>areSmall (a, b)</tt>
</p>
</li>
<ul>
returns true iff both <tt>a</tt> and <tt>b</tt> are small.
</ul>
<li class="gap">
<p>
<tt>gcd (a, b)</tt>
</p>
</li>
<ul>
uses the GnuMP's fast gcd implementation.
</ul>
<li class="gap">
<p>
<tt>isSmall a</tt>
</p>
</li>
<ul>
returns true iff <tt>a</tt> is small.
</ul>
<li class="gap">
<p>
<tt>datatype rep</tt>
</p>
</li>
<ul>
the underlying representation of an <tt>IntInf.int</tt>.
</ul>
<li class="gap">
<p>
<tt>rep i</tt>
</p>
</li>
<ul>
returns the underlying representation of <tt>i</tt>. </ul>
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<p>
<hr>
Last edited on 2005-12-02 03:46:17 by <span title="209-6-203-188.c3-0.smr-ubr1.sbo-smr.ma.cable.rcn.com"><a href="MatthewFluet">MatthewFluet</a></span>.
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