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140 lines
5.3 KiB
HTML
140 lines
5.3 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>count</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ Standard Template Library API Reference" />
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<link rel="up" href="db_map.html" title="Chapter 5. Db_map" />
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<link rel="prev" href="stldb_mapequal_range.html" title="equal_range" />
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<link rel="next" href="stldb_mapupper_bound.html" title="upper_bound" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">count</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="stldb_mapequal_range.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 5.
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Db_map </th>
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<td width="20%" align="right"> <a accesskey="n" href="stldb_mapupper_bound.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="stldb_mapcount"></a>count</h2>
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</div>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="stldb_mapcount_details"></a>Function Details</h3>
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</div>
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</div>
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</div>
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<pre class="programlisting">
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size_type count(const key_type &x) const
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</pre>
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<p>Count the number of key/data pairs having specified key x. </p>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3603021"></a>Parameters</h4>
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</div>
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</div>
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</div>
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<div class="sect4" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h5 class="title"><a id="id3603156"></a>x</h5>
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</div>
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</div>
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</div>
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<p>The key to count. </p>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3603133"></a>Return Value</h4>
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</div>
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</div>
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</div>
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<p>The number of key/data pairs having x as key within the container. </p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3603139"></a>See Also</h4>
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</div>
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</div>
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</div>
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<p>
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</p>
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<p><a class="ulink" href="http://www.cplusplus.com/reference/stl/map/count/" target="_top">http://www.cplusplus.com/reference/stl/map/count/</a> </p>
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<p>
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3602933"></a>Group: Searching Functions</h3>
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</div>
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</div>
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</div>
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<p>The following functions are returning iterators, and they by default return read-write iterators.</p>
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<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>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3602982"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="db_map.html" title="Chapter 5. Db_map">db_map</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="stldb_mapequal_range.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="db_map.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="stldb_mapupper_bound.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">equal_range </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> upper_bound</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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