<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>BoostBook element class</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../reference.html" title="Reference"> <link rel="prev" href="access.html" title="BoostBook element access"> <link rel="next" href="librarycategorydef.html" title="BoostBook element librarycategorydef"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> <td align="center"><a href="../../../../index.html">Home</a></td> <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="access.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="librarycategorydef.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="refentry"> <a name="boostbook.dtd.class"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle"> BoostBook element <code class="sgmltag-element">class</code></span></h2> <p>class — Declares a class or class template</p> </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv">class ::= (<a class="link" href="template.html" title="BoostBook element template">template</a>?, <a class="link" href="inherit.html" title="BoostBook element inherit">inherit</a>*, <a class="link" href="purpose.html" title="BoostBook element purpose">purpose</a>?, <a class="link" href="description.html" title="BoostBook element description">description</a>?, (<a class="link" href="access.html" title="BoostBook element access">access</a>| <a class="link" href="static-constant.html" title="BoostBook element static-constant">static-constant</a>| <a class="link" href="typedef.html" title="BoostBook element typedef">typedef</a>| <a class="link" href="enum.html" title="BoostBook element enum">enum</a>| <a class="link" href="copy-assignment.html" title="BoostBook element copy-assignment">copy-assignment</a>| <a class="link" href="constructor.html" title="BoostBook element constructor">constructor</a>| <a class="link" href="destructor.html" title="BoostBook element destructor">destructor</a>| <a class="link" href="method-group.html" title="BoostBook element method-group">method-group</a>| <a class="link" href="free-function-group.html" title="BoostBook element free-function-group">free-function-group</a>| <a class="link" href="function.html" title="BoostBook element function">function</a>| <a class="link" href="method.html" title="BoostBook element method">method</a>| <a class="link" href="overloaded-function.html" title="BoostBook element overloaded-function">overloaded-function</a>| <a class="link" href="overloaded-method.html" title="BoostBook element overloaded-method">overloaded-method</a>| <a class="link" href="data-member.html" title="BoostBook element data-member">data-member</a>| <a class="link" href="class.html" title="BoostBook element class">class</a>| <a class="link" href="class-specialization.html" title="BoostBook element class-specialization">class-specialization</a>| <a class="link" href="struct.html" title="BoostBook element struct">struct</a>| <a class="link" href="struct-specialization.html" title="BoostBook element struct-specialization">struct-specialization</a>| <a class="link" href="union.html" title="BoostBook element union">union</a>| <a class="link" href="union-specialization.html" title="BoostBook element union-specialization">union-specialization</a>)*) </div> <div class="refsection"> <a name="id3239334"></a><h2>Description</h2> <p>C++ classes and class templates are described via the <class> element. Each class has a name (e.g., "any") given by the <code class="computeroutput">name</code> attribute, a purpose given by the <purpose> element, documentation, and a set of types, functions, base classes, and data members. Here is a minimal definition of the <code class="computeroutput"><a class="link" href="../../boost/any.html" title="Class any">boost::any</a></code> class:</p> <pre class="programlisting"><namespace name="boost"> <class name="any"> <purpose> A class whose instances can hold instances of any type that satisfies ValueType requirements. </purpose> </class> </namespace></pre> <p>Additional class documentation can be contained in a <code class="sgmltag-element">description</code> element following the <purpose> element. This documentation will be typeset prior to documentation for specific elements in the class (e.g., constructors or methods).</p> <p>Class inheritance is described via the <inherit> element. The <inherit> element requires an <code class="computeroutput">access</code> attribute which must be one of <span class="emphasis"><em>public</em></span>, <span class="emphasis"><em>protected</em></span>, or <span class="emphasis"><em>private</em></span>. The content of the <inherited> element in C++ code that names the class inherited, and may contain markup to link to the class. The following description of the class <code class="computeroutput"><a class="link" href="../../boost/bad_any_cast.html" title="Class bad_any_cast">boost::bad_any_cast</a></code> describes public inheritance from the class <code class="computeroutput">std::bad_cast</code>. It also defines the <purpose> element, which contains a short description of the use of the class.</p> <pre class="programlisting"><class name="bad_any_cast"> <inherit access="public"><classname>std::bad_cast</classname></inherit> <purpose><para>The exception thrown in the event of a failed <functionname>any_cast</functionname> of an <classname>any</classname> value.</para></purpose> </class></pre> <p>Class templates are defined by <class> elements with a <template> child element at the beginning.</p> </div> <div class="refsection"> <a name="id3239470"></a><h2>Attributes</h2> <div class="informaltable"><table class="table"> <colgroup> <col> <col> <col> <col> </colgroup> <thead><tr> <th>Name</th> <th>Type</th> <th>Value</th> <th>Purpose</th> </tr></thead> <tbody> <tr> <td>last-revision</td> <td>#IMPLIED</td> <td>CDATA</td> <td>Set to $Date: 2009-10-10 15:53:46 +0100 (Sat, 10 Oct 2009) $ to keep "last revised" information in sync with CVS changes</td> </tr> <tr> <td>name</td> <td>#REQUIRED</td> <td>CDATA</td> <td>The name of the element being declared to referenced</td> </tr> <tr> <td>id</td> <td>#IMPLIED</td> <td>CDATA</td> <td>A global identifier for this element</td> </tr> <tr> <td>xml:base</td> <td>#IMPLIED</td> <td>CDATA</td> <td>Implementation detail used by XIncludes</td> </tr> </tbody> </table></div> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2003-2005 Douglas Gregor<p>Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>). </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="access.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="librarycategorydef.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>