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<pre class=code>
<B><FONT COLOR="#5F9EA0">signature</FONT></B> MLTON_CONT <B><FONT COLOR="#5F9EA0">=</FONT></B>
<B><FONT COLOR="#5F9EA0">sig</FONT></B>
<B><FONT COLOR="#A020F0">type</FONT></B> 'a t
<B><FONT COLOR="#A020F0">val</FONT></B> callcc: ('a t <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> 'a) <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> 'a
<B><FONT COLOR="#A020F0">val</FONT></B> prepend: 'a t <B><FONT COLOR="#5F9EA0">*</FONT></B> ('b <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> 'a) <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> 'b t
<B><FONT COLOR="#A020F0">val</FONT></B> throw: 'a t <B><FONT COLOR="#5F9EA0">*</FONT></B> 'a <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> 'b
<B><FONT COLOR="#A020F0">val</FONT></B> throw': 'a t <B><FONT COLOR="#5F9EA0">*</FONT></B> (<B><FONT COLOR="#228B22">unit</FONT></B> <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> 'a) <B><FONT COLOR="#5F9EA0">-</FONT></B><B><FONT COLOR="#5F9EA0">></FONT></B> 'b
<B><FONT COLOR="#A020F0">end</FONT></B>
</PRE>
<p>
</p>
<ul>
<li>
<p>
<tt>type 'a t</tt>
</p>
</li>
<ul>
the type of continuations that expect a value of type <tt>'a</tt>.
</ul>
<li class="gap">
<p>
<tt>callcc f</tt>
</p>
</li>
<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>
<li class="gap">
<p>
<tt>prepend (k, f)</tt>
</p>
</li>
<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>
<li class="gap">
<p>
<tt>throw (k, v)</tt>
</p>
</li>
<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>
<li class="gap">
<p>
<tt>throw' (k, th)</tt>
</p>
</li>
<ul>
a generalization of throw that evaluates <tt>th ()</tt> in the context of <tt>k</tt>. Thus, for example, if <tt>th ()</tt> raises an exception or grabs another continuation, it will see <tt>k</tt>, not the current continuation. </ul>
</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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