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<td class="t-ddcl-list-item-nopad"> <div><span class="mw-geshi cpp source-cpp">iterator find<span class="br0">(</span> <span class="kw4">const</span> Key<span class="sy3">&amp;</span> key <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-ddcl-list-item-nopad"> <div><span class="mw-geshi cpp source-cpp">const_iterator find<span class="br0">(</span> <span class="kw4">const</span> Key<span class="sy3">&amp;</span> key <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<p>Finds an element with key <tt>key</tt>.  
</p>
<table id="toc" class="toc"><tr><td>
<div id="toctitle"><h2>Contents</h2></div>
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<li class="toclevel-1"><a href="#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1"><a href="#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1"><a href="#Complexity"><span class="tocnumber">3</span> <span class="toctext">Complexity</span></a></li>
<li class="toclevel-1"><a href="#See_also"><span class="tocnumber">4</span> <span class="toctext">See also</span></a></li>
<li class="toclevel-1 tocsection-1"><a href="#Example"><span class="tocnumber">5</span> <span class="toctext">Example</span></a></li>
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<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/find&amp;action=edit&amp;section=T-1" title="Template:cpp/container/find">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span>
</h3>
<table class="t-param-list-begin"><tr class="t-param-list-item">
<td>  key
</td>
<td> -
</td>
<td>  key value of the element to search for
</td>
</tr></table>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/find&amp;action=edit&amp;section=T-2" title="Template:cpp/container/find">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span>
</h3>
<p>Iterator to an element with key <tt>key</tt>. If no such element is found, past-the-end (see <a href="end.html" title="cpp/container/map/end"><tt>end()</tt></a>) iterator is returned.
</p>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/find&amp;action=edit&amp;section=T-3" title="Template:cpp/container/find">edit</a>]</span> <span class="mw-headline" id="Complexity">Complexity</span>
</h3>
<p>Logarithmic in the size of the container.
</p>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/find&amp;action=edit&amp;section=T-4" title="Template:cpp/container/find">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span>
</h3>
<table class="t-dcl-list-begin">
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<td>  <div class="t-dcl-member-div"><div><a href="count.html" title="cpp/container/map/count"> count</a></div></div>
</td>
<td>   returns the number of elements matching specific key  <br><span class="t-mark">(public member function)</span> 
</td>
</tr>
<tr><td colspan="2" class="t-dcl-list-sep">
</td></tr>
<tr class="t-dcl-list-item">
<td>  <div class="t-dcl-member-div"><div><a href="equal_range.html" title="cpp/container/map/equal range"> equal_range</a></div></div>
</td>
<td>   returns range of elements matching a specific key <br><span class="t-mark">(public member function)</span> 
</td>
</tr>
</table>
<p><br></p>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/map/find&amp;action=edit&amp;section=1" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span>
</h3>
<p> Demonstrates the risk of accessing non-existing elements via operator [].
 </p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;map&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw1">typedef</span> <a href="../map.html"><span class="kw1061">std::<span class="me2">map</span></span></a><span class="sy1">&lt;</span><a href="../../string/basic_string.html"><span class="kw1034">std::<span class="me2">string</span></span></a>,<span class="kw4">int</span><span class="sy1">&gt;</span>  mapT<span class="sy4">;</span>
 
    mapT my_map<span class="sy4">;</span>
    my_map<span class="br0">[</span><span class="st0">"first"</span><span class="br0">]</span><span class="sy1">=</span>  <span class="nu0">11</span><span class="sy4">;</span>
    my_map<span class="br0">[</span><span class="st0">"second"</span><span class="br0">]</span><span class="sy1">=</span> <span class="nu0">23</span><span class="sy4">;</span>
 
    mapT<span class="sy4">::</span><span class="me2">iterator</span>  it<span class="sy1">=</span> my_map.<span class="me1">find</span><span class="br0">(</span><span class="st0">"first"</span><span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">if</span><span class="br0">(</span> it <span class="sy3">!</span><span class="sy1">=</span> my_map.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">)</span> <a href="../../io/basic_ostream.html"><span class="kw1418">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"A: "</span> <span class="sy1">&lt;&lt;</span> it<span class="sy2">-</span><span class="sy1">&gt;</span>second <span class="sy1">&lt;&lt;</span> <span class="st0">"<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
    it<span class="sy1">=</span> my_map.<span class="me1">find</span><span class="br0">(</span><span class="st0">"third"</span><span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">if</span><span class="br0">(</span> it <span class="sy3">!</span><span class="sy1">=</span> my_map.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">)</span> <a href="../../io/basic_ostream.html"><span class="kw1418">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"B: "</span> <span class="sy1">&lt;&lt;</span> it<span class="sy2">-</span><span class="sy1">&gt;</span>second <span class="sy1">&lt;&lt;</span> <span class="st0">"<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
    <span class="co1">// Accessing a non-existing element creates it</span>
    <span class="kw1">if</span><span class="br0">(</span> my_map<span class="br0">[</span><span class="st0">"third"</span><span class="br0">]</span> <span class="sy1">==</span> <span class="nu0">42</span> <span class="br0">)</span> <a href="../../io/basic_ostream.html"><span class="kw1418">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"Oha!<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
    it<span class="sy1">=</span> my_map.<span class="me1">find</span><span class="br0">(</span><span class="st0">"third"</span><span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">if</span><span class="br0">(</span> it <span class="sy3">!</span><span class="sy1">=</span> my_map.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">)</span> <a href="../../io/basic_ostream.html"><span class="kw1418">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"C: "</span> <span class="sy1">&lt;&lt;</span> it<span class="sy2">-</span><span class="sy1">&gt;</span>second <span class="sy1">&lt;&lt;</span> <span class="st0">"<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
    <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">A: 11
C: 0</pre></div></div>

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