<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <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" /> </head> <body> <div class="navheader"> <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> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="func_details"></a> Function Details</h3> </div> </div> </div> <pre class="programlisting"> reference at(index_type n) </pre> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"></div> <p>Index function. </p> <p></p> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1546798"></a> Parameters</h4> </div> </div> </div> <div class="sect4" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h5 class="title"><a id="id1546911"></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="id1546801"></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="id1546909"></a> See Also</h4> </div> </div> </div> <p> </p> <p><a class="ulink" href="http://www.cplusplus.com/reference/stl/vector/at.html" target="_top">http://www.cplusplus.com/reference/stl/vector/at.html</a> </p> <p> </p> </div> <pre class="programlisting"> const_reference at(index_type n) const </pre> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"></div> <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> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1546875"></a> Parameters</h4> </div> </div> </div> <div class="sect4" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h5 class="title"><a id="id1546965"></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="id1546876"></a> Return Value</h4> </div> </div> </div> <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="id1546905"></a> See Also</h4> </div> </div> </div> <p> </p> <p><a class="ulink" href="http://www.cplusplus.com/reference/stl/vector/at.html" target="_top">http://www.cplusplus.com/reference/stl/vector/at.html</a> </p> <p> </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1546906"></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="id1546829"></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 /> <table width="100%" summary="Navigation footer"> <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> </body> </html>