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44 lines
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Chapter 5. Diagnostics</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="keywords" content=" ISO C++ , library "/><meta name="keywords" content=" ISO C++ , runtime , library "/><link rel="home" href="../index.html" title="The GNU C++ Library"/><link rel="up" href="bk01pt02.html" title="Part II. Standard Contents"/><link rel="prev" href="termination.html" title="Termination"/><link rel="next" href="bk01pt02ch05s02.html" title="Concept Checking"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 5.
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Diagnostics
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</th></tr><tr><td align="left"><a accesskey="p" href="termination.html">Prev</a> </td><th width="60%" align="center">Part II.
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Standard Contents
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</th><td align="right"> <a accesskey="n" href="bk01pt02ch05s02.html">Next</a></td></tr></table><hr/></div><div class="chapter" title="Chapter 5. Diagnostics"><div class="titlepage"><div><div><h2 class="title"><a id="std.diagnostics"/>Chapter 5.
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Diagnostics
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<a id="id484626" class="indexterm"/>
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</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl><dt><span class="section"><a href="diagnostics.html#std.diagnostics.exceptions">Exceptions</a></span></dt><dd><dl><dt><span class="section"><a href="diagnostics.html#std.diagnostics.exceptions.api">API Reference</a></span></dt><dt><span class="section"><a href="diagnostics.html#std.diagnostics.exceptions.data">Adding Data to <code class="classname">exception</code></a></span></dt></dl></dd><dt><span class="section"><a href="bk01pt02ch05s02.html">Concept Checking</a></span></dt></dl></div><div class="section" title="Exceptions"><div class="titlepage"><div><div><h2 class="title"><a id="std.diagnostics.exceptions"/>Exceptions</h2></div></div></div><div class="section" title="API Reference"><div class="titlepage"><div><div><h3 class="title"><a id="std.diagnostics.exceptions.api"/>API Reference</h3></div></div></div><p>
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All exception objects are defined in one of the standard header
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files: <code class="filename">exception</code>,
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<code class="filename">stdexcept</code>, <code class="filename">new</code>, and
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<code class="filename">typeinfo</code>.
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</p><p>
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The base exception object is <code class="classname">exception</code>,
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located in <code class="filename">exception</code>. This object has no
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<code class="classname">string</code> member.
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</p><p>
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Derived from this are several classes that may have a
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<code class="classname">string</code> member: a full hierarchy can be
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found in the source documentation.
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</p><p>
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Full API details.
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</p></div><div class="section" title="Adding Data to exception"><div class="titlepage"><div><div><h3 class="title"><a id="std.diagnostics.exceptions.data"/>Adding Data to <code class="classname">exception</code></h3></div></div></div><p>
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The standard exception classes carry with them a single string as
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data (usually describing what went wrong or where the 'throw' took
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place). It's good to remember that you can add your own data to
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these exceptions when extending the hierarchy:
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</p><pre class="programlisting">
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struct My_Exception : public std::runtime_error
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{
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public:
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My_Exception (const string& whatarg)
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: std::runtime_error(whatarg), e(errno), id(GetDataBaseID()) { }
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int errno_at_time_of_throw() const { return e; }
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DBID id_of_thing_that_threw() const { return id; }
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protected:
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int e;
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DBID id; // some user-defined type
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};
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</pre></div></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="termination.html">Prev</a> </td><td align="center"><a accesskey="u" href="bk01pt02.html">Up</a></td><td align="right"> <a accesskey="n" href="bk01pt02ch05s02.html">Next</a></td></tr><tr><td align="left" valign="top">Termination </td><td align="center"><a accesskey="h" href="../index.html">Home</a></td><td align="right" valign="top"> Concept Checking</td></tr></table></div></body></html>
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