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>operator[]</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_vectorcapacity.html" title="capacity" /> 12 <link rel="next" href="stldb_vectorat.html" title="at" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center"> 19operator[] 20</th> 21 </tr> 22 <tr> 23 <td width="20%" align="left"><a accesskey="p" href="stldb_vectorcapacity.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_vectorat.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_vectoroperator_sqbrk"></a> 36operator[] 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��operator[](index_type��n) 52 </pre> 53 <div class="sect3" lang="en" xml:lang="en"> 54 <div class="titlepage"></div> 55 <p>Index operator, can act as both a left value and a right value. </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="id1546820"></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="id1546812"></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="id1546897"></a> 84Return Value</h4> 85 </div> 86 </div> 87 </div> 88 <p>The reference to the element at specified position. </p> 89 </div> 90 <pre class="programlisting"> 91const_reference��operator[](index_type��n)��const 92 </pre> 93 <div class="sect3" lang="en" xml:lang="en"> 94 <div class="titlepage"></div> 95 <p>Read only index operator. </p> 96 <p>Only used as a right value, no need for assignment capability. The return value can't be used to update the element. </p> 97 </div> 98 <div class="sect3" lang="en" xml:lang="en"> 99 <div class="titlepage"> 100 <div> 101 <div> 102 <h4 class="title"><a id="id1546894"></a> 103Parameters</h4> 104 </div> 105 </div> 106 </div> 107 <div class="sect4" lang="en" xml:lang="en"> 108 <div class="titlepage"> 109 <div> 110 <div> 111 <h5 class="title"><a id="id1546847"></a> 112 n </h5> 113 </div> 114 </div> 115 </div> 116 <p>The valid index of the vector. </p> 117 </div> 118 </div> 119 <div class="sect3" lang="en" xml:lang="en"> 120 <div class="titlepage"> 121 <div> 122 <div> 123 <h4 class="title"><a id="id1546789"></a> 124Return Value</h4> 125 </div> 126 </div> 127 </div> 128 <p>The const reference to the element at specified position. </p> 129 </div> 130 </div> 131 <div class="sect2" lang="en" xml:lang="en"> 132 <div class="titlepage"> 133 <div> 134 <div> 135 <h3 class="title"><a id="id1546790"></a> 136Group: Element access functions.</h3> 137 </div> 138 </div> 139 </div> 140 <p>The operator[] and <a class="link" href="stldb_vectorat.html" title="at">at()</a> 141 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> 142 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> 143 <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> 144 </div> 145 <div class="sect2" lang="en" xml:lang="en"> 146 <div class="titlepage"> 147 <div> 148 <div> 149 <h3 class="title"><a id="id1546685"></a> 150Class</h3> 151 </div> 152 </div> 153 </div> 154 <p> 155 <a class="link" href="db_vector.html" title="Chapter��4.�� Db_vector"> 156 db_vector</a> 157 </p> 158 </div> 159 </div> 160 <div class="navfooter"> 161 <hr /> 162 <table width="100%" summary="Navigation footer"> 163 <tr> 164 <td width="40%" align="left"><a accesskey="p" href="stldb_vectorcapacity.html">Prev</a>��</td> 165 <td width="20%" align="center"> 166 <a accesskey="u" href="db_vector.html">Up</a> 167 </td> 168 <td width="40%" align="right">��<a accesskey="n" href="stldb_vectorat.html">Next</a></td> 169 </tr> 170 <tr> 171 <td width="40%" align="left" valign="top"> 172capacity 173��</td> 174 <td width="20%" align="center"> 175 <a accesskey="h" href="index.html">Home</a> 176 </td> 177 <td width="40%" align="right" valign="top">�� 178at 179</td> 180 </tr> 181 </table> 182 </div> 183 </body> 184</html> 185