1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 6 <title>at</title> 7 <link rel="stylesheet" href="apiReference.css" type="text/css" /> 8 <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> 9 <link rel="start" href="index.html" title="Berkeley DB C++ Standard Template Library API Reference" /> 10 <link rel="up" href="db_vector.html" title="Chapter��4.�� Db_vector" /> 11 <link rel="prev" href="stldb_vectoroperator_sqbrk.html" title="operator[]" /> 12 <link rel="next" href="stldb_vectorfront.html" title="front" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center"> 19at 20</th> 21 </tr> 22 <tr> 23 <td width="20%" align="left"><a accesskey="p" href="stldb_vectoroperator_sqbrk.html">Prev</a>��</td> 24 <th width="60%" align="center">Chapter��4.�� 25 Db_vector </th> 26 <td width="20%" align="right">��<a accesskey="n" href="stldb_vectorfront.html">Next</a></td> 27 </tr> 28 </table> 29 <hr /> 30 </div> 31 <div class="sect1" lang="en" xml:lang="en"> 32 <div class="titlepage"> 33 <div> 34 <div> 35 <h2 class="title" style="clear: both"><a id="stldb_vectorat"></a> 36at 37</h2> 38 </div> 39 </div> 40 </div> 41 <div class="sect2" lang="en" xml:lang="en"> 42 <div class="titlepage"> 43 <div> 44 <div> 45 <h3 class="title"><a id="func_details"></a> 46Function Details</h3> 47 </div> 48 </div> 49 </div> 50 <pre class="programlisting"> 51reference��at(index_type��n) 52 </pre> 53 <div class="sect3" lang="en" xml:lang="en"> 54 <div class="titlepage"></div> 55 <p>Index function. </p> 56 <p></p> 57 </div> 58 <div class="sect3" lang="en" xml:lang="en"> 59 <div class="titlepage"> 60 <div> 61 <div> 62 <h4 class="title"><a id="id1546798"></a> 63Parameters</h4> 64 </div> 65 </div> 66 </div> 67 <div class="sect4" lang="en" xml:lang="en"> 68 <div class="titlepage"> 69 <div> 70 <div> 71 <h5 class="title"><a id="id1546911"></a> 72 n </h5> 73 </div> 74 </div> 75 </div> 76 <p>The valid index of the vector. </p> 77 </div> 78 </div> 79 <div class="sect3" lang="en" xml:lang="en"> 80 <div class="titlepage"> 81 <div> 82 <div> 83 <h4 class="title"><a id="id1546801"></a> 84Return Value</h4> 85 </div> 86 </div> 87 </div> 88 <p>The reference to the element at specified position, can act as both a left value and a right value. </p> 89 </div> 90 <div class="sect3" lang="en" xml:lang="en"> 91 <div class="titlepage"> 92 <div> 93 <div> 94 <h4 class="title"><a id="id1546909"></a> 95See Also</h4> 96 </div> 97 </div> 98 </div> 99 <p> 100 </p> 101 <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> 102 <p> </p> 103 </div> 104 <pre class="programlisting"> 105const_reference��at(index_type��n)��const 106 </pre> 107 <div class="sect3" lang="en" xml:lang="en"> 108 <div class="titlepage"></div> 109 <p>Read only index function. </p> 110 <p>Only used as a right value, no need for assignment capability. The return value can't be used to update the element. </p> 111 </div> 112 <div class="sect3" lang="en" xml:lang="en"> 113 <div class="titlepage"> 114 <div> 115 <div> 116 <h4 class="title"><a id="id1546875"></a> 117Parameters</h4> 118 </div> 119 </div> 120 </div> 121 <div class="sect4" lang="en" xml:lang="en"> 122 <div class="titlepage"> 123 <div> 124 <div> 125 <h5 class="title"><a id="id1546965"></a> 126 n </h5> 127 </div> 128 </div> 129 </div> 130 <p>The valid index of the vector. </p> 131 </div> 132 </div> 133 <div class="sect3" lang="en" xml:lang="en"> 134 <div class="titlepage"> 135 <div> 136 <div> 137 <h4 class="title"><a id="id1546876"></a> 138Return Value</h4> 139 </div> 140 </div> 141 </div> 142 <p>The const reference to the element at specified position. </p> 143 </div> 144 <div class="sect3" lang="en" xml:lang="en"> 145 <div class="titlepage"> 146 <div> 147 <div> 148 <h4 class="title"><a id="id1546905"></a> 149See Also</h4> 150 </div> 151 </div> 152 </div> 153 <p> 154 </p> 155 <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> 156 <p> </p> 157 </div> 158 </div> 159 <div class="sect2" lang="en" xml:lang="en"> 160 <div class="titlepage"> 161 <div> 162 <div> 163 <h3 class="title"><a id="id1546906"></a> 164Group: Element access functions.</h3> 165 </div> 166 </div> 167 </div> 168 <p>The operator[] and <a class="link" href="stldb_vectorat.html" title="at">at()</a> 169 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> 170 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> 171 <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> 172 </div> 173 <div class="sect2" lang="en" xml:lang="en"> 174 <div class="titlepage"> 175 <div> 176 <div> 177 <h3 class="title"><a id="id1546829"></a> 178Class</h3> 179 </div> 180 </div> 181 </div> 182 <p> 183 <a class="link" href="db_vector.html" title="Chapter��4.�� Db_vector"> 184 db_vector</a> 185 </p> 186 </div> 187 </div> 188 <div class="navfooter"> 189 <hr /> 190 <table width="100%" summary="Navigation footer"> 191 <tr> 192 <td width="40%" align="left"><a accesskey="p" href="stldb_vectoroperator_sqbrk.html">Prev</a>��</td> 193 <td width="20%" align="center"> 194 <a accesskey="u" href="db_vector.html">Up</a> 195 </td> 196 <td width="40%" align="right">��<a accesskey="n" href="stldb_vectorfront.html">Next</a></td> 197 </tr> 198 <tr> 199 <td width="40%" align="left" valign="top"> 200operator[] 201��</td> 202 <td width="20%" align="center"> 203 <a accesskey="h" href="index.html">Home</a> 204 </td> 205 <td width="40%" align="right" valign="top">�� 206front 207</td> 208 </tr> 209 </table> 210 </div> 211 </body> 212</html> 213