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+<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Adding Data to Exceptions</title><meta name="generator" content="DocBook XSL Stylesheets V1.74.0" /><meta name="keywords" content=" ISO C++ , library " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="exceptions.html" title="Chapter 7. Exceptions" /><link rel="prev" href="exceptions.html" title="Chapter 7. Exceptions" /><link rel="next" href="bk01pt03ch07s03.html" title="Cancellation" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Adding Data to Exceptions</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="exceptions.html">Prev</a> </td><th width="60%" align="center">Chapter 7. Exceptions</th><td width="20%" align="right"> <a accesskey="n" href="bk01pt03ch07s03.html">Next</a></td></tr></table><hr /></div><div class="sect1" lang="en" xml:lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.diagnostics.exceptions.data"></a>Adding Data to Exceptions</h2></div></div></div><p>
+ The standard exception classes carry with them a single string as
+ data (usually describing what went wrong or where the 'throw' took
+ place). It's good to remember that you can add your own data to
+ these exceptions when extending the hierarchy:
+ </p><pre class="programlisting">
+ struct My_Exception : public std::runtime_error
+ {
+ public:
+ My_Exception (const string& whatarg)
+ : std::runtime_error(whatarg), e(errno), id(GetDataBaseID()) { }
+ int errno_at_time_of_throw() const { return e; }
+ DBID id_of_thing_that_threw() const { return id; }
+ protected:
+ int e;
+ DBID id; // some user-defined type
+ };
+ </pre></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="exceptions.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="exceptions.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="bk01pt03ch07s03.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 7. Exceptions </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Cancellation</td></tr></table></div></body></html>
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