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TailCall
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net.sf.saxon.expr.instruct</FONT>
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Interface TailCall</H2>
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<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../net/sf/saxon/expr/instruct/CallTemplate.CallTemplatePackage.html" title="class in net.sf.saxon.expr.instruct">CallTemplate.CallTemplatePackage</A></DD>
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<DT><PRE>public interface <B>TailCall</B></DL>
</PRE>
<P>
Interface representing a Tail Call. This is a package of information passed back by a called
instruction to its caller, representing a call (and its arguments) that needs to be made
by the caller. This saves stack space by unwinding the stack before making the call.
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<CODE> <A HREF="../../../../../net/sf/saxon/expr/instruct/TailCall.html" title="interface in net.sf.saxon.expr.instruct">TailCall</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/TailCall.html#processLeavingTail()">processLeavingTail</A></B>()</CODE>
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Process this TailCall (that is, executed the template call that is packaged in this
object).</TD>
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<A NAME="processLeavingTail()"><!-- --></A><H3>
processLeavingTail</H3>
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<A HREF="../../../../../net/sf/saxon/expr/instruct/TailCall.html" title="interface in net.sf.saxon.expr.instruct">TailCall</A> <B>processLeavingTail</B>()
throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
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<DD>Process this TailCall (that is, executed the template call that is packaged in this
object). This may return a further TailCall, which should also be processed: this
is the mechanism by which a nested set of recursive calls is converted into an iteration.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>a further TailCall, if the recursion continues, or null, indicating that the
recursion has terminated.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if any error occurs processing the tail call</DL>
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