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<html><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4patched version by: Kenshi Muto, Debian Project.LaTeX2HTML 2002 (1.62),original version by: Nikos Drakos, CBLU, University of Leeds* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan* with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --><HTML><HEAD><TITLE>11.1.1 Definition of a new timer</TITLE><META NAME="description" CONTENT="11.1.1 Definition of a new timer"><META NAME="keywords" CONTENT="everything"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4"><META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"><LINK REL="STYLESHEET" HREF="everything.css" tppabs="http://www.isi.edu/nsnam/ns/doc/everything.css"><LINK REL="next" HREF="node124.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node124.html"><LINK REL="previous" HREF="node122.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node122.html"><LINK REL="up" HREF="node122.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node122.html"><LINK REL="next" HREF="node124.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node124.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html3185" HREF="node124.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node124.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html3179" HREF="node122.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node122.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html3173" HREF="node122.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node122.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html3181" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html3183" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html3186" HREF="node124.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node124.html">11.1.2 Example: Tcp retransmission</A><B> Up:</B> <A NAME="tex2html3180" HREF="node122.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node122.html">11.1 C++ abstract base</A><B> Previous:</B> <A NAME="tex2html3174" HREF="node122.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node122.html">11.1 C++ abstract base</A>   <B> <A NAME="tex2html3182" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html3184" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H2><A NAME="SECTION03811000000000000000"></A><A NAME="sec:definition"></A><BR>11.1.1 Definition of a new timer</H2><P>To define a new timer, subclass this function anddefine []handle if needed([]handle is not always required):<PRE> class MyTimer : public TimerHandler { public: MyTimer(MyAgentClass *a) : TimerHandler() { a_ = a; } virtual double expire(Event *e); protected: MyAgentClass *a_; };</PRE>Then define expire:<PRE> double MyTimer::expire(Event *e) { // do the work // return TIMER_HANDLED; // =\> do not reschedule timer // return delay; // =\> reschedule timer after delay }</PRE>Note that []expire can return either the flag TIMER_HANDLED or adelay value, depending on the requirements for this timer.<P>Often <TT>MyTimer</TT> will be a friend of <TT>MyAgentClass</TT>, or []expire will only call a public function of <TT>MyAgentClass</TT>.<P>Timers are not directly accessible from the OTcl level, although users arefree to establish method bindings if they so desire.<P><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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