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libdb/docs/api_reference/STL/stldb_maplower_bound.html
Gregory Burd 940129b94f Release 5.2.36 on 9/14/2022
2011-12-19 19:07:10 -05:00

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>lower_bound</title>
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<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" />
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<body>
<div xmlns="" class="navheader">
<div class="libver">
<p>Library Version 11.2.5.2</p>
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<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="stldb_maplower_bound_details"></a>Function Details</h3>
</div>
</div>
</div>
<pre class="programlisting">
const_iterator lower_bound(const key_type &amp;x) const
</pre>
<p>Find the greatest key less than or equal to x. </p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3602401"></a>Parameters</h4>
</div>
</div>
</div>
<div class="sect4" lang="en" xml:lang="en">
<div class="titlepage">
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<div>
<h5 class="title"><a id="id3602880"></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="id3602858"></a>Return Value</h4>
</div>
</div>
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<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="id3602864"></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 &amp;x,
bool readonly=false)
</pre>
<p>Find the greatest key less than or equal to x. </p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3602691"></a>Parameters</h4>
</div>
</div>
</div>
<div class="sect4" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h5 class="title"><a id="id3602789"></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="id3602756"></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="id3602761"></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="id3602874"></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="id3602441"></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="id3602922"></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>
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<hr />
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<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>
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