<?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>operator--</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_base_iterator.html" title="Chapter 12. Db_vector_base_iterator" /> <link rel="prev" href="stldb_vector_base_iteratoroperator_incr.html" title="operator++" /> <link rel="next" href="stldb_vector_base_iteratoroperator_assign.html" title="operator=" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center"> operator-- </th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="stldb_vector_base_iteratoroperator_incr.html">Prev</a> </td> <th width="60%" align="center">Chapter 12. Db_vector_base_iterator </th> <td width="20%" align="right"> <a accesskey="n" href="stldb_vector_base_iteratoroperator_assign.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_vector_base_iteratoroperator_decr"></a> operator-- </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"> self& operator--() </pre> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"></div> <p>Pre-decrement. </p> <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> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1559908"></a> Return Value</h4> </div> </div> </div> <p>This iterator after decremented. </p> </div> <pre class="programlisting"> self operator--(int) </pre> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"></div> <p>Post-decrement. </p> <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> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1560005"></a> Return Value</h4> </div> </div> </div> <p>A new iterator not decremented. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1559754"></a> Group: Iterator movement operators.</h3> </div> </div> </div> <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> <p>When an iterator is moved closer to "begin", we say it is moved forward, otherwise we say it is moved backward. </p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1559978"></a> Class</h3> </div> </div> </div> <p> <a class="link" href="db_vector_base_iterator.html" title="Chapter 12. Db_vector_base_iterator"> db_vector_base_iterator</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_vector_base_iteratoroperator_incr.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="db_vector_base_iterator.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="stldb_vector_base_iteratoroperator_assign.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"> operator= </td> </tr> </table> </div> </body> </html>