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<pre class=code>
<B><FONT COLOR="#0000FF">signature</FONT></B> MLTON_CONT =
   <B><FONT COLOR="#0000FF">sig</FONT></B>
      <B><FONT COLOR="#A020F0">type</FONT></B><FONT COLOR="#228B22"><B> 'a t

      </FONT></B><B><FONT COLOR="#A020F0">val</FONT></B> callcc: ('a t -&gt; 'a) -&gt; 'a
      <B><FONT COLOR="#A020F0">val</FONT></B> prepend: 'a t * ('b -&gt; 'a) -&gt; 'b t
      <B><FONT COLOR="#A020F0">val</FONT></B> throw: 'a t * 'a -&gt; 'b
      <B><FONT COLOR="#A020F0">val</FONT></B> throw': 'a t * (unit -&gt; 'a) -&gt; 'b
   <B><FONT COLOR="#0000FF">end</FONT></B>
</PRE>
<p>
 
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    <ul>

    <li>
<p>
 <tt>type&nbsp;'a&nbsp;t</tt> 
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        <ul>

  the type of continuations that expect a value of type <tt>'a</tt>. 
        </ul>


    <li class="gap">
<p>
 <tt>callcc&nbsp;f</tt> 
</p>
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        <ul>

  applies <tt>f</tt> to the current continuation.  This copies the entire   stack; hence, <tt>callcc</tt> takes time proportional to the current   stack size. 
        </ul>


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 <tt>prepend&nbsp;(k,&nbsp;f)</tt> 
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        <ul>

  composes a function <tt>f</tt> with a continuation <tt>k</tt> to create a   continuation that first does <tt>f</tt> and then does <tt>k</tt>.  This   is a constant time operation. 
        </ul>


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 <tt>throw&nbsp;(k,&nbsp;v)</tt> 
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        <ul>

  throws value <tt>v</tt> to continuation <tt>k</tt>.  This copies the entire   stack of <tt>k</tt>; hence, <tt>throw</tt> takes time proportional to the    size of this stack. 
        </ul>


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<p>
 <tt>throw'&nbsp;(k,&nbsp;th)</tt> 
</p>
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        <ul>

  a generalization of throw that evaluates <tt>th&nbsp;()</tt> in the context   of <tt>k</tt>.  Thus, for example, if <tt>th&nbsp;()</tt> raises an exception or   grabs another continuation, it will see <tt>k</tt>, not the current   continuation. </ul>

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<p>
<hr>
Last edited on 2005-12-01 22:27:22 by <span title="ppp-71-139-183-221.dsl.snfc21.pacbell.net"><a href="StephenWeeks">StephenWeeks</a></span>.
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