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begin [C++ Reference]
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<h2><a name="begin" id="begin">begin</a></h2>
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<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <set></span>
iterator begin<span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span>
const_iterator begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy0">;</span></pre>
<p>
The function begin() returns an iterator to the first element of the multiset.
begin() should run in <a href="../../complexity.html" class="wikilink1" title="complexity">constant time</a>.
</p>
<p>
For example, the following code uses begin() to initialize an iterator that is
used to traverse the elements of a multiset:
</p>
<pre class="c code c++" style="font-family:monospace;"> multiset<span class="sy0"><</span>int<span class="sy0">></span> ms<span class="sy0">;</span>
multiset<span class="sy0"><</span>int<span class="sy0">>::</span><span class="me2">iterator</span> iter<span class="sy0">;</span>
<span class="kw4">int</span> i<span class="sy0">;</span>
<span class="kw1">for</span> <span class="br0">(</span>i <span class="sy0">=</span> <span class="nu0">1</span><span class="sy0">;</span> i <span class="sy0"><</span> <span class="nu0">5</span><span class="sy0">;</span> i<span class="sy0">++</span><span class="br0">)</span> <span class="br0">{</span>
ms.<span class="me1">insert</span><span class="br0">(</span>i<span class="br0">)</span><span class="sy0">;</span>
ms.<span class="me1">insert</span><span class="br0">(</span>i<span class="sy0">*</span>i<span class="br0">)</span><span class="sy0">;</span>
ms.<span class="me1">insert</span><span class="br0">(</span>i<span class="sy0">-</span>1<span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"ms is:"</span> <span class="sy0">;</span>
<span class="kw1">for</span> <span class="br0">(</span>iter <span class="sy0">=</span> ms.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span> iter <span class="sy0">!=</span> ms.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span> iter<span class="sy0">++</span><span class="br0">)</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">" "</span> <span class="sy0"><<</span> <span class="sy0">*</span>iter<span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"."</span> <span class="sy0"><<</span> endl<span class="sy0">;</span></pre>
<p>
The above code produces the following output:
</p>
<pre class="code">
ms is: 0 1 1 1 2 2 3 3 4 4 9 16.</pre>
<p>
Related Topics: <a href="../../stl/multiset/end.html" class="wikilink1" title="stl:multiset:end">end</a>, <a href="../../stl/multiset/rbegin.html" class="wikilink1" title="stl:multiset:rbegin">rbegin</a>, <a href="../../stl/multiset/rend.html" class="wikilink1" title="stl:multiset:rend">rend</a>
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