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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../unordered_multimap.html" title="cpp/container/unordered multimap"><span class="t-lines"><span>unordered_multimap</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../stack.html" title="cpp/container/stack"><span class="t-lines"><span>stack</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../queue.html" title="cpp/container/queue"><span class="t-lines"><span>queue</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../priority_queue.html" title="cpp/container/priority queue"><span class="t-lines"><span>priority_queue</span></span></a></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../set.html" title="cpp/container/set"><tt>std::set</tt></a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> Member functions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="set.html" title="cpp/container/set/set"><span class="t-lines"><span>set::set</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="~set.html" title="cpp/container/set/~set"><span class="t-lines"><span>set::~set</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator=.html" title="cpp/container/set/operator="><span class="t-lines"><span>set::operator=</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="get_allocator.html" title="cpp/container/set/get allocator"><span class="t-lines"><span>set::get_allocator</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Iterators</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="begin.html" title="cpp/container/set/begin"><span class="t-lines"><span>set::begin</span><span>set::cbegin</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="end.html" title="cpp/container/set/end"><span class="t-lines"><span>set::end</span><span>set::cend</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="rbegin.html" title="cpp/container/set/rbegin"><span class="t-lines"><span>set::rbegin</span><span>set::crbegin</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="rend.html" title="cpp/container/set/rend"><span class="t-lines"><span>set::rend</span><span>set::crend</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Capacity</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="empty.html" title="cpp/container/set/empty"><span class="t-lines"><span>set::empty</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="size.html" title="cpp/container/set/size"><span class="t-lines"><span>set::size</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="max_size.html" title="cpp/container/set/max size"><span class="t-lines"><span>set::max_size</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Modifiers</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="clear.html" title="cpp/container/set/clear"><span class="t-lines"><span>set::clear</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>set::insert</span></span></strong></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="emplace.html" title="cpp/container/set/emplace"><span class="t-lines"><span>set::emplace</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="emplace_hint.html" title="cpp/container/set/emplace hint"><span class="t-lines"><span>set::emplace_hint</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="erase.html" title="cpp/container/set/erase"><span class="t-lines"><span>set::erase</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="swap.html" title="cpp/container/set/swap"><span class="t-lines"><span>set::swap</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Lookup</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="count.html" title="cpp/container/set/count"><span class="t-lines"><span>set::count</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="find.html" title="cpp/container/set/find"><span class="t-lines"><span>set::find</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="equal_range.html" title="cpp/container/set/equal range"><span class="t-lines"><span>set::equal_range</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="lower_bound.html" title="cpp/container/set/lower bound"><span class="t-lines"><span>set::lower_bound</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="upper_bound.html" title="cpp/container/set/upper bound"><span class="t-lines"><span>set::upper_bound</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Observers</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="key_comp.html" title="cpp/container/set/key comp"><span class="t-lines"><span>set::key_comp</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="value_comp.html" title="cpp/container/set/value comp"><span class="t-lines"><span>set::value_comp</span></span></a></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/set/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp"><a href="../../utility/pair.html"><span class="kw936">std::<span class="me2">pair</span></span></a><span class="sy1"><</span>iterator,<span class="kw4">bool</span><span class="sy1">></span> insert<span class="br0">(</span> <span class="kw4">const</span> value_type<span class="sy3">&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><a href="../../utility/pair.html"><span class="kw936">std::<span class="me2">pair</span></span></a><span class="sy1"><</span>iterator,<span class="kw4">bool</span><span class="sy1">></span> insert<span class="br0">(</span> value_type<span class="sy3">&&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(3)</td>
<td></td>
</tr>
<tr class="t-dcl t-until-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp">iterator insert<span class="br0">(</span> iterator hint, <span class="kw4">const</span> value_type<span class="sy3">&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td> <span class="t-mark-rev t-until-cxx11">(until C++11)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp">iterator insert<span class="br0">(</span> const_iterator hint, <span class="kw4">const</span> value_type<span class="sy3">&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
</tbody><tbody>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp">iterator insert<span class="br0">(</span> const_iterator hint, value_type<span class="sy3">&&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (4) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> InputIt <span class="sy1">></span><br />
<span class="kw4">void</span> insert<span class="br0">(</span> InputIt first, InputIt last <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (5) </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> insert<span class="br0">(</span> <a href="../../utility/initializer_list.html"><span class="kw838">std::<span class="me2">initializer_list</span></span></a><span class="sy1"><</span>value_type<span class="sy1">></span> ilist <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (6) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Inserts element(s) into the container, if the container doesn't already contain an element with an equivalent key.
</p>
<div class="t-li1"><span class="t-li">1-2)</span> inserts <code>value</code>. </div>
<div class="t-li1"><span class="t-li">3-4)</span> inserts <code>value</code> in the position as close as possible, just prior<span class="t-mark-rev t-since-cxx11">(since C++11)</span>, to <code>hint</code>. </div>
<div class="t-li1"><span class="t-li">5)</span> Inserts elements from range <code>[first, last)</code>.</div>
<div class="t-li1"><span class="t-li">6)</span> Inserts elements from initializer list <code>ilist</code>.</div>
<p>No iterators or references are invalidated.
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="insert.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="insert.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="insert.html#Exceptions"><span class="tocnumber">3</span> <span class="toctext">Exceptions</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="insert.html#Complexity"><span class="tocnumber">4</span> <span class="toctext">Complexity</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="insert.html#Notes"><span class="tocnumber">5</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="insert.html#Example"><span class="tocnumber">6</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-7"><a href="insert.html#See_also"><span class="tocnumber">7</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/set/insert&action=edit&section=1" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> hint
</td>
<td> -
</td>
<td> <table class="t-rev-begin"><tr class="t-rev t-until-cxx11"><td>iterator, used as a suggestion as to where to start the search</td>
<td><span class="t-mark-rev t-until-cxx11">(until C++11)</span></td></tr><tr class="t-rev t-since-cxx11"><td>iterator to the position before which the new element will be inserted</td>
<td><span class="t-mark-rev t-since-cxx11">(since C++11)</span></td></tr></table>
</td></tr>
<tr class="t-par">
<td> value
</td>
<td> -
</td>
<td> element value to insert
</td></tr>
<tr class="t-par">
<td> first, last
</td>
<td> -
</td>
<td> range of elements to insert
</td></tr>
<tr class="t-par">
<td> ilist
</td>
<td> -
</td>
<td> initializer list to insert the values from
</td></tr>
<tr class="t-par-hitem">
<td colspan="3"> Type requirements
</td></tr>
<tr class="t-par-req">
<td colspan="3"> -<div class="spacer"></div><code>InputIt</code> must meet the requirements of <a href="../../concept/InputIterator.html" title="cpp/concept/InputIterator"><code>InputIterator</code></a>.
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/set/insert&action=edit&section=2" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<div class="t-li1"><span class="t-li">1-2)</span> Returns a pair consisting of an iterator to the inserted element (or to the element that prevented the insertion) and a <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span> denoting whether the insertion took place.</div>
<div class="t-li1"><span class="t-li">3-4)</span> Returns an iterator to the inserted element, or to the element that prevented the insertion.</div>
<div class="t-li1"><span class="t-li">5-6)</span> (none)</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/set/insert&action=edit&section=3" title="Edit section: Exceptions">edit</a>]</span> <span class="mw-headline" id="Exceptions">Exceptions</span></h3>
<div class="t-li1"><span class="t-li">1-4)</span> If an exception is thrown by any operation, the insertion has no effect.</div>
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style=""><tr><td class="mbox-empty-cell"></td><td class="mbox-text" style="">This section is incomplete<br />Reason: cases 5-6 </td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/set/insert&action=edit&section=4" title="Edit section: Complexity">edit</a>]</span> <span class="mw-headline" id="Complexity">Complexity</span></h3>
<div class="t-li1"><span class="t-li">1-2)</span> Logarithmic in the size of the container, <code>O(log(size()))</code>.</div>
<table class="t-rev-begin">
<tr class="t-rev t-until-cxx11"><td>
<div class="t-li1"><span class="t-li">3-4)</span> Amortized constant if the insertion happens in the position just <i>after</i> the hint, logarithmic in the size of the container otherwise.
</div></td>
<td><span class="t-mark-rev t-until-cxx11">(until C++11)</span></td></tr>
<tr class="t-rev t-since-cxx11"><td>
<div class="t-li1"><span class="t-li">3-4)</span> Amortized constant if the insertion happens in the position just <i>before</i> the hint, logarithmic in the size of the container otherwise.
</div></td>
<td><span class="t-mark-rev t-since-cxx11">(since C++11)</span></td></tr>
</table>
<div class="t-li1"><span class="t-li">5-6)</span> <code>O(N*log(size() + N))</code>, where N is the number of elements to insert.</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/set/insert&action=edit&section=5" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>The hinted insert <span class="t-v">(3,4)</span> does not return a boolean in order to be signature-compatible with positional insert on sequential containers, such as <span class="t-lc"><a href="../vector/insert.html" title="cpp/container/vector/insert">std::vector::insert</a></span>. This makes it possible to create generic inserters such as <span class="t-lc"><a href="../../iterator/inserter.html" title="cpp/iterator/inserter">std::inserter</a></span>. One way to check success of a hinted insert is to compare <a href="size.html" title="cpp/container/set/size">size()</a> before and after.
</p><p>The overloads <span class="t-v">(5,6)</span> are often implemented as a loop that calls the overload (3) with <span class="t-lc"><a href="end.html" title="cpp/container/set/end">end()</a></span> as the hint; they are optimized for appending a sorted sequence (such as another set) whose smallest element is greater than the last element in <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span>
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/set/insert&action=edit&section=6" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include <set></span>
<span class="co2">#include <cassert></span>
<span class="co2">#include <iostream></span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="../set.html"><span class="kw1098">std::<span class="me2">set</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> set<span class="sy4">;</span>
 
<span class="kw4">auto</span> result_1 <span class="sy1">=</span> set.<span class="me1">insert</span><span class="br0">(</span><span class="nu0">3</span><span class="br0">)</span><span class="sy4">;</span>
<a href="../../error/assert.html"><span class="kw654">assert</span></a><span class="br0">(</span>result_1.<span class="me1">first</span> <span class="sy3">!</span><span class="sy1">=</span> set.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// it's a valid iterator</span>
<a href="../../error/assert.html"><span class="kw654">assert</span></a><span class="br0">(</span><span class="sy2">*</span>result_1.<span class="me1">first</span> <span class="sy1">==</span> <span class="nu0">3</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span>result_1.<span class="me1">second</span><span class="br0">)</span>
<a href="../../io/cout.html"><span class="kw1481">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"insert done<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
<span class="kw4">auto</span> result_2 <span class="sy1">=</span> set.<span class="me1">insert</span><span class="br0">(</span><span class="nu0">3</span><span class="br0">)</span><span class="sy4">;</span>
<a href="../../error/assert.html"><span class="kw654">assert</span></a><span class="br0">(</span>result_2.<span class="me1">first</span> <span class="sy1">==</span> result_1.<span class="me1">first</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// same iterator</span>
<a href="../../error/assert.html"><span class="kw654">assert</span></a><span class="br0">(</span><span class="sy2">*</span>result_2.<span class="me1">first</span> <span class="sy1">==</span> <span class="nu0">3</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span><span class="sy3">!</span>result_2.<span class="me1">second</span><span class="br0">)</span>
<a href="../../io/cout.html"><span class="kw1481">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"no insertion<span class="es1">\n</span>"</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">insert done
no insertion</pre></div></div>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/set/insert&action=edit&section=7" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">
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<td> <div class="t-dsc-member-div"><div><a href="emplace.html" title="cpp/container/set/emplace"> <span class="t-lines"><span>emplace</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> constructs element in-place <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/dsc_emplace&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="emplace_hint.html" title="cpp/container/set/emplace hint"> <span class="t-lines"><span>emplace_hint</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> constructs elements in-place using a hint <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/dsc_emplace_hint&action=edit">[edit]</a></span>
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