<?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>lower_bound</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_map.html" title="Chapter 5. Db_map" /> <link rel="prev" href="stldb_mapfind.html" title="find" /> <link rel="next" href="stldb_mapequal_range.html" title="equal_range" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center"> lower_bound </th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="stldb_mapfind.html">Prev</a> </td> <th width="60%" align="center">Chapter 5. Db_map </th> <td width="20%" align="right"> <a accesskey="n" href="stldb_mapequal_range.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_maplower_bound"></a> lower_bound </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"> const_iterator lower_bound(const key_type &x) const </pre> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"></div> <p>Find the greatest key less than or equal to x. </p> <p></p> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1551981"></a> Parameters</h4> </div> </div> </div> <div class="sect4" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h5 class="title"><a id="id1552194"></a> x </h5> </div> </div> </div> <p>The target key to find. </p> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1551982"></a> Return Value</h4> </div> </div> </div> <p>The valid const iterator sitting on the key, or an invalid one. </p> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1552190"></a> See Also</h4> </div> </div> </div> <p> </p> <p><a class="ulink" href="http://www.cplusplus.com/reference/stl/map/lower_bound/" target="_top">http://www.cplusplus.com/reference/stl/map/lower_bound/</a> </p> <p> </p> </div> <pre class="programlisting"> iterator lower_bound(const key_type &x, bool readonly=false) </pre> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"></div> <p>Find the greatest key less than or equal to x. </p> <p></p> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1552230"></a> Parameters</h4> </div> </div> </div> <div class="sect4" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h5 class="title"><a id="id1552296"></a> x </h5> </div> </div> </div> <p>The target key to find. </p> </div> <div class="sect4" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h5 class="title"><a id="id1552221"></a> readonly </h5> </div> </div> </div> <p>Whether the returned iterator is readonly. </p> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1552231"></a> Return Value</h4> </div> </div> </div> <p>The valid iterator sitting on the key, or an invalid one. </p> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1552393"></a> See Also</h4> </div> </div> </div> <p> </p> <p><a class="ulink" href="http://www.cplusplus.com/reference/stl/map/lower_bound/" target="_top">http://www.cplusplus.com/reference/stl/map/lower_bound/</a> </p> <p> </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1552000"></a> Group: Searching Functions</h3> </div> </div> </div> <p>The following functions are returning iterators, and they by default return read-write iterators.</p> <p>If you intend to use the returned iterator only to read, you should call the const version of each function using a const reference to this container. Using const iterators can potentially promote concurrency a lot. You can also set the readonly parameter to each non-const version of the functions to true if you don't use the returned iterator to write, which also promotes concurrency and overall performance. </p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1552098"></a> Class</h3> </div> </div> </div> <p> <a class="link" href="db_map.html" title="Chapter 5. Db_map"> db_map</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_mapfind.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="db_map.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="stldb_mapequal_range.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top"> find </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> equal_range </td> </tr> </table> </div> </body> </html>