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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 -> {done: unit -> 'a vector,
sub: int -> 'a,
update: int * 'a -> unit}
<B><FONT COLOR="#A020F0">val</FONT></B> unfoldi: int * 'b * (int * 'b -> 'a * 'b) -> 'a vector * 'b
<B><FONT COLOR="#0000FF">end</FONT></B>
</PRE>
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<p>
<tt>create 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 (i, x)</tt>, one must have already called <tt>update (j, x)</tt> for all <tt>j</tt> in <tt>[0, i)</tt>. The <tt>done</tt>, <tt>sub</tt>, and <tt>update</tt> functions are all constant-time operations.
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<tt>unfoldi (n, b, 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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