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119 lines
5.3 KiB
HTML
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Chapter 22. ElementRef and ElementHolder Wappers</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ Standard Template Library API Reference" />
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<link rel="up" href="index.html" title="Berkeley DB C++ Standard Template Library API Reference" />
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<link rel="prev" href="dbstl_helper_classes.html" title="Chapter 21. Dbstl Helper Classes" />
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<link rel="next" href="ElementHolder.html" title="Chapter 23. ElementHolder" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Chapter 22.
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ElementRef and ElementHolder Wappers </th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbstl_helper_classes.html">Prev</a> </td>
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<th width="60%" align="center"> </th>
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<td width="20%" align="right"> <a accesskey="n" href="ElementHolder.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="chapter" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title"><a id="Element_wrappers"></a>Chapter 22.
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ElementRef and ElementHolder Wappers </h2>
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</div>
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</div>
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</div>
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<p>An <a class="link" href="ElementRef.html" title="Chapter 24. ElementRef">ElementRef</a>
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and <a class="link" href="ElementHolder.html" title="Chapter 23. ElementHolder">ElementHolder</a>
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object represents the reference to the data element referenced by an iterator. </p>
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<p>Each iterator object has an <a class="link" href="ElementRef.html" title="Chapter 24. ElementRef">ElementRef</a>
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or <a class="link" href="ElementHolder.html" title="Chapter 23. ElementHolder">ElementHolder</a>
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object that stores the data element that the iterator points to.</p>
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<p>The <a class="link" href="ElementHolder.html" title="Chapter 23. ElementHolder">ElementHolder</a>
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class is used to store primitive types into STL containers.</p>
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<p>The <a class="link" href="ElementRef.html" title="Chapter 24. ElementRef">ElementRef</a>
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class is used to store other types into STL containers.</p>
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<p>The <a class="link" href="ElementRef.html" title="Chapter 24. ElementRef">ElementRef</a>
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and <a class="link" href="ElementHolder.html" title="Chapter 23. ElementHolder">ElementHolder</a>
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classes have identical interfaces, and are treated the same by other STL classes. Since the <a class="link" href="ElementRef.html" title="Chapter 24. ElementRef">ElementRef</a>
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class inherits from the template data class, all methods have a _DB_STL_ prefix to avoid name clashes.</p>
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<p>An <a class="link" href="ElementRef.html" title="Chapter 24. ElementRef">ElementRef</a>
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or <a class="link" href="ElementHolder.html" title="Chapter 23. ElementHolder">ElementHolder</a>
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class corresponds to a single iterator instance. An Element object is generally owned by an iterator object. The ownership relationship is swapped in some specific situations, specifically for the dereference and array index operator. </p>
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<h4><a id="id3537992"></a> Public Members </h4>
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<div class="informaltable">
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<table border="1" width="80%">
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<colgroup>
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<col />
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<col />
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</colgroup>
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<thead>
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<tr>
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<th>Member</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>
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<a class="link" href="ElementRef.html" title="Chapter 24. ElementRef">
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ElementRef</a>
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</td>
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<td>
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ElementRef</td>
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</tr>
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<tr>
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<td>
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<a class="link" href="ElementHolder.html" title="Chapter 23. ElementHolder">
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ElementHolder</a>
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</td>
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<td>
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ElementHolder</td>
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</tr>
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</tbody>
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</table>
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</div>
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<h4><a id="id3538179"></a>
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Group</h4>
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<p>
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<a class="xref" href="dbstl_helper_classes.html" title="Chapter 21. Dbstl Helper Classes">
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Dbstl Helper Classes </a>
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</p>
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<p>
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</p>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="dbstl_helper_classes.html">Prev</a> </td>
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<td width="20%" align="center"> </td>
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<td width="40%" align="right"> <a accesskey="n" href="ElementHolder.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Chapter 21.
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Dbstl Helper Classes </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Chapter 23. ElementHolder </td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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