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libdb/docs/api_reference/STL/stldb_vectorat.html
Gregory Burd eff277ac23 Release 5.2.28 on 6/10/2011
2011-09-13 13:44:24 -04:00

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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>at</title>
<link rel="stylesheet" href="apiReference.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
<link rel="start" href="index.html" title="Berkeley DB C++ Standard Template Library API Reference" />
<link rel="up" href="db_vector.html" title="Chapter 4.  Db_vector" />
<link rel="prev" href="stldb_vectoroperator_sqbrk.html" title="operator[]" />
<link rel="next" href="stldb_vectorfront.html" title="front" />
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<div xmlns="" class="navheader">
<div class="libver">
<p>Library Version 11.2.5.2</p>
</div>
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">at</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="stldb_vectoroperator_sqbrk.html">Prev</a> </td>
<th width="60%" align="center">Chapter 4. 
Db_vector </th>
<td width="20%" align="right"> <a accesskey="n" href="stldb_vectorfront.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="stldb_vectorat"></a>at</h2>
</div>
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<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="stldb_vectorat_details"></a>Function Details</h3>
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<pre class="programlisting">
reference at(index_type n)
</pre>
<p>Index function. </p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3517259"></a>Parameters</h4>
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<div class="sect4" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h5 class="title"><a id="id3517460"></a>n</h5>
</div>
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<p>The valid index of the vector. </p>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3517160"></a>Return Value</h4>
</div>
</div>
</div>
<p>The reference to the element at specified position, can act as both a left value and a right value. </p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3517278"></a>See Also</h4>
</div>
</div>
</div>
<p>
</p>
<p><a class="ulink" href="http://www.cplusplus.com/reference/stl/vector/at/" target="_top">http://www.cplusplus.com/reference/stl/vector/at/</a> </p>
<p>
</p>
</div>
<pre class="programlisting">
const_reference at(index_type n) const
</pre>
<p>Read only index function. </p>
<p>Only used as a right value, no need for assignment capability. The return value can't be used to update the element. </p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3517245"></a>Parameters</h4>
</div>
</div>
</div>
<div class="sect4" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h5 class="title"><a id="id3517248"></a>n</h5>
</div>
</div>
</div>
<p>The valid index of the vector. </p>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3517443"></a>Return Value</h4>
</div>
</div>
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<p>The const reference to the element at specified position. </p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3517449"></a>See Also</h4>
</div>
</div>
</div>
<p>
</p>
<p><a class="ulink" href="http://www.cplusplus.com/reference/stl/vector/at/" target="_top">http://www.cplusplus.com/reference/stl/vector/at/</a> </p>
<p>
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="id3517241"></a>Group: Element access functions.</h3>
</div>
</div>
</div>
<p>The operator[] and <a class="link" href="stldb_vectorat.html" title="at">at()</a>
only come from std::vector and std::deque, If you are using <a class="link" href="db_vector.html" title="Chapter 4.  Db_vector">db_vector</a>
as std::list, you don't have to set DB_RENUMBER flag to the backing database handle, and you get better performance, but at the same time you can't use these functions.</p>
<p>Otherwise if you have set the DB_RENUMBER flag to the backing database handle, you can use this function though it is an std::list equivalent. </p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="id3517524"></a>Class</h3>
</div>
</div>
</div>
<p>
<a class="link" href="db_vector.html" title="Chapter 4.  Db_vector">db_vector</a>
</p>
</div>
</div>
<div class="navfooter">
<hr />
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<tr>
<td width="40%" align="left"><a accesskey="p" href="stldb_vectoroperator_sqbrk.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="db_vector.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="stldb_vectorfront.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">operator[] </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> front</td>
</tr>
</table>
</div>
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