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_base_iterator.html" title="Chapter��12.�� Db_vector_base_iterator" /> 11 <link rel="prev" href="stldb_vector_base_iteratoroperator_incr.html" title="operator++" /> 12 <link rel="next" href="stldb_vector_base_iteratoroperator_assign.html" title="operator=" /> 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_vector_base_iteratoroperator_incr.html">Prev</a>��</td> 24 <th width="60%" align="center">Chapter��12.�� 25 Db_vector_base_iterator </th> 26 <td width="20%" align="right">��<a accesskey="n" href="stldb_vector_base_iteratoroperator_assign.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_vector_base_iteratoroperator_decr"></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"> 51self&��operator--() 52 </pre> 53 <div class="sect3" lang="en" xml:lang="en"> 54 <div class="titlepage"></div> 55 <p>Pre-decrement. </p> 56 <p>Move the iterator one element backward, so that the element it sits on has a smaller index. Use --iter rather than iter-- where possible to avoid two useless iterator copy constructions. </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="id1559908"></a> 63Return Value</h4> 64 </div> 65 </div> 66 </div> 67 <p>This iterator after decremented. </p> 68 </div> 69 <pre class="programlisting"> 70self��operator--(int) 71 </pre> 72 <div class="sect3" lang="en" xml:lang="en"> 73 <div class="titlepage"></div> 74 <p>Post-decrement. </p> 75 <p>Move the iterator one element backward, so that the element it sits on has a smaller index. Use --iter rather than iter-- where possible to avoid two useless iterator copy constructions. </p> 76 </div> 77 <div class="sect3" lang="en" xml:lang="en"> 78 <div class="titlepage"> 79 <div> 80 <div> 81 <h4 class="title"><a id="id1560005"></a> 82Return Value</h4> 83 </div> 84 </div> 85 </div> 86 <p>A new iterator not decremented. </p> 87 </div> 88 </div> 89 <div class="sect2" lang="en" xml:lang="en"> 90 <div class="titlepage"> 91 <div> 92 <div> 93 <h3 class="title"><a id="id1559754"></a> 94Group: Iterator movement operators.</h3> 95 </div> 96 </div> 97 </div> 98 <p>When we talk about iterator movement, we think the container is a uni-directional range, represented by [begin, end), and this is true no matter we are using iterators or reverse iterators.</p> 99 <p>When an iterator is moved closer to "begin", we say it is moved forward, otherwise we say it is moved backward. </p> 100 </div> 101 <div class="sect2" lang="en" xml:lang="en"> 102 <div class="titlepage"> 103 <div> 104 <div> 105 <h3 class="title"><a id="id1559978"></a> 106Class</h3> 107 </div> 108 </div> 109 </div> 110 <p> 111 <a class="link" href="db_vector_base_iterator.html" title="Chapter��12.�� Db_vector_base_iterator"> 112 db_vector_base_iterator</a> 113 </p> 114 </div> 115 </div> 116 <div class="navfooter"> 117 <hr /> 118 <table width="100%" summary="Navigation footer"> 119 <tr> 120 <td width="40%" align="left"><a accesskey="p" href="stldb_vector_base_iteratoroperator_incr.html">Prev</a>��</td> 121 <td width="20%" align="center"> 122 <a accesskey="u" href="db_vector_base_iterator.html">Up</a> 123 </td> 124 <td width="40%" align="right">��<a accesskey="n" href="stldb_vector_base_iteratoroperator_assign.html">Next</a></td> 125 </tr> 126 <tr> 127 <td width="40%" align="left" valign="top"> 128operator++ 129��</td> 130 <td width="20%" align="center"> 131 <a accesskey="h" href="index.html">Home</a> 132 </td> 133 <td width="40%" align="right" valign="top">�� 134operator= 135</td> 136 </tr> 137 </table> 138 </div> 139 </body> 140</html> 141