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<pre class=code>
<B><FONT COLOR="#0000FF">signature</FONT></B> MLTON_VECTOR =
   <B><FONT COLOR="#0000FF">sig</FONT></B>
      <B><FONT COLOR="#A020F0">val</FONT></B> create: int -&gt; {done: unit -&gt; 'a vector,
                          sub: int -&gt; 'a,
                          update: int * 'a -&gt; unit}
      <B><FONT COLOR="#A020F0">val</FONT></B> unfoldi: int * 'b * (int * 'b -&gt; 'a * 'b) -&gt; 'a vector * 'b
   <B><FONT COLOR="#0000FF">end</FONT></B>
</PRE>
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<p>
 <tt>create&nbsp;n</tt>  <br>
initiates the construction a vector <em>v</em> of length <tt>n</tt>,  returning functions to manipulate the vector.  The <tt>done</tt>  function may be called to return the created vector; it is an error  to call <tt>done</tt> before all entries have been initialized; it is an  error to call <tt>done</tt> after having called <tt>done</tt>.  The  <tt>sub</tt> function may be called to return an initialized vector  entry; it is not an error to call <tt>sub</tt> after having called  <tt>done</tt>.  The <tt>update</tt> function may be called to initialize a  vector entry; it is an error to call <tt>update</tt> after having called  <tt>done</tt>.  One must initialize vector entries in order from lowest  to highest; that is, before calling <tt>update&nbsp;(i,&nbsp;x)</tt>, one must  have already called <tt>update&nbsp;(j,&nbsp;x)</tt> for all <tt>j</tt> in   <tt>[0,&nbsp;i)</tt>.  The <tt>done</tt>, <tt>sub</tt>, and <tt>update</tt> functions  are all constant-time operations. 
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<p>
 <tt>unfoldi&nbsp;(n,&nbsp;b,&nbsp;f)</tt>  <br>
constructs a vector <em>v</em> of length <tt>n</tt>, whose elements  <em>v<sub>i</sub></em> are determined by the equations <em>b<sub>0</sub> = b</em> and  <em>(v<sub>i</sub>, b<sub>i+1</sub>) = f (i, b<sub>i</sub>)</em>. 
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Last edited on 2007-08-23 03:45:50 by <span title="c-71-57-91-146.hsd1.il.comcast.net"><a href="MatthewFluet">MatthewFluet</a></span>.
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