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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unordered_multiset.html" title="cpp/container/unordered multiset"><span class="t-lines"><span>unordered_multiset</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="unordered_map.html" title="cpp/container/unordered map"><span class="t-lines"><span>unordered_map</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="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"><strong class="selflink"><tt>std::vector</tt></strong><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="vector/vector.html" title="cpp/container/vector/vector"><span class="t-lines"><span>vector::vector</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/~vector.html" title="cpp/container/vector/~vector"><span class="t-lines"><span>vector::~vector</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/operator=.html" title="cpp/container/vector/operator="><span class="t-lines"><span>vector::operator=</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/assign.html" title="cpp/container/vector/assign"><span class="t-lines"><span>vector::assign</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/get_allocator.html" title="cpp/container/vector/get allocator"><span class="t-lines"><span>vector::get_allocator</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Element access</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/at.html" title="cpp/container/vector/at"><span class="t-lines"><span>vector::at</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/operator_at.html" title="cpp/container/vector/operator at"><span class="t-lines"><span>vector::operator[]</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/front.html" title="cpp/container/vector/front"><span class="t-lines"><span>vector::front</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/back.html" title="cpp/container/vector/back"><span class="t-lines"><span>vector::back</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/data.html" title="cpp/container/vector/data"><span class="t-lines"><span>vector::data</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-h2"><td colspan="5"> Iterators</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/begin.html" title="cpp/container/vector/begin"><span class="t-lines"><span>vector::begin</span><span>vector::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="vector/end.html" title="cpp/container/vector/end"><span class="t-lines"><span>vector::end</span><span>vector::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="vector/rbegin.html" title="cpp/container/vector/rbegin"><span class="t-lines"><span>vector::rbegin</span><span>vector::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="vector/rend.html" title="cpp/container/vector/rend"><span class="t-lines"><span>vector::rend</span><span>vector::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="vector/empty.html" title="cpp/container/vector/empty"><span class="t-lines"><span>vector::empty</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/size.html" title="cpp/container/vector/size"><span class="t-lines"><span>vector::size</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/max_size.html" title="cpp/container/vector/max size"><span class="t-lines"><span>vector::max_size</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/reserve.html" title="cpp/container/vector/reserve"><span class="t-lines"><span>vector::reserve</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/capacity.html" title="cpp/container/vector/capacity"><span class="t-lines"><span>vector::capacity</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/shrink_to_fit.html" title="cpp/container/vector/shrink to fit"><span class="t-lines"><span>vector::shrink_to_fit</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-h2"><td colspan="5"> Modifiers</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/clear.html" title="cpp/container/vector/clear"><span class="t-lines"><span>vector::clear</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/insert.html" title="cpp/container/vector/insert"><span class="t-lines"><span>vector::insert</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/emplace.html" title="cpp/container/vector/emplace"><span class="t-lines"><span>vector::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="vector/erase.html" title="cpp/container/vector/erase"><span class="t-lines"><span>vector::erase</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/push_back.html" title="cpp/container/vector/push back"><span class="t-lines"><span>vector::push_back</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/emplace_back.html" title="cpp/container/vector/emplace back"><span class="t-lines"><span>vector::emplace_back</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="vector/pop_back.html" title="cpp/container/vector/pop back"><span class="t-lines"><span>vector::pop_back</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/resize.html" title="cpp/container/vector/resize"><span class="t-lines"><span>vector::resize</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vector/swap.html" title="cpp/container/vector/swap"><span class="t-lines"><span>vector::swap</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/vector/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-dsc-header">
<td> <div>Defined in header <code><a href="../header/vector.html" title="cpp/header/vector"><vector></a></code>
</div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><br />
<p>    <span class="kw1">class</span> T,<br />
    <span class="kw1">class</span> Allocator <span class="sy1">=</span> <a href="../memory/allocator.html"><span class="kw601">std::<span class="me2">allocator</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><br />
</p>
<span class="sy1">></span> <span class="kw1">class</span> vector<span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p><code>std::vector</code> is a sequence container that encapsulates dynamic size arrays.
</p>
<table class="t-rev-begin">
<tr class="t-rev t-since-cxx03"><td> The elements are stored contiguously, which means that elements can be accessed not only through iterators, but also using offsets on regular pointers to elements. This means that a pointer to an element of a vector may be passed to any function that expects a pointer to an element of an array.</td>
<td><span class="t-mark-rev t-since-cxx03">(since C++03)</span></td></tr>
</table>
<p>The storage of the vector is handled automatically, being expanded and contracted as needed. Vectors usually occupy more space than static arrays, because more memory is allocated to handle future growth. This way a vector does not need to reallocate each time an element is inserted, but only when the additional memory is exhausted. The total amount of allocated memory can be queried using <span class="t-lc">capacity()</span> function. <span class="t-rev-inl t-since-cxx11"><span> Extra memory can be returned to the system via a call to <span class="t-lc">shrink_to_fit()</span>.</span> <span><span class="t-mark-rev t-since-cxx11">(since C++11)</span></span></span>
</p><p>Reallocations are usually costly operations in terms of performance. <span class="t-lc">reserve()</span> function can be used to eliminate reallocations if the number of elements is known beforehand.
</p><p>The complexity (efficiency) of common operations on vectors is as follows:
</p>
<ul><li> Random access - constant <span class="texhtml" style="white-space: nowrap;">O(1)</span>
</li><li> Insertion or removal of elements at the end - amortized constant <span class="texhtml" style="white-space: nowrap;">O(1)</span>
</li><li> Insertion or removal of elements - linear in distance to the end of the vector <span class="texhtml" style="white-space: nowrap;">O(n)</span>
</li></ul>
<p><code>std::vector</code> meets the requirements of <a href="../concept/Container.html" title="cpp/concept/Container"><code>Container</code></a>, <a href="../concept/AllocatorAwareContainer.html" title="cpp/concept/AllocatorAwareContainer"><code>AllocatorAwareContainer</code></a>, <a href="../concept/SequenceContainer.html" title="cpp/concept/SequenceContainer"><code>SequenceContainer</code></a> <span class="t-rev-inl t-since-cxx17"><span>, <a href="http://en.cppreference.com/mwiki/index.php?title=cpp/concept/ContiguousContainer&action=edit&redlink=1" class="new" title="cpp/concept/ContiguousContainer (page does not exist)"><code>ContiguousContainer</code></a> (for <code>T</code> other than <code>bool</code>)</span> <span><span class="t-mark-rev t-since-cxx17">(since C++17)</span></span></span> and <a href="../concept/ReversibleContainer.html" title="cpp/concept/ReversibleContainer"><code>ReversibleContainer</code></a>.
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="vector.html#Template_parameters"><span class="tocnumber">1</span> <span class="toctext">Template parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="vector.html#Specializations"><span class="tocnumber">2</span> <span class="toctext">Specializations</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="vector.html#Iterator_invalidation"><span class="tocnumber">3</span> <span class="toctext">Iterator invalidation</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="vector.html#Member_types"><span class="tocnumber">4</span> <span class="toctext">Member types</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="vector.html#Member_functions"><span class="tocnumber">5</span> <span class="toctext">Member functions</span></a>
<ul>
<li class="toclevel-2"><a href="vector.html#Element_access"><span class="tocnumber">5.1</span> <span class="toctext">Element access</span></a></li>
<li class="toclevel-2"><a href="vector.html#Iterators"><span class="tocnumber">5.2</span> <span class="toctext">Iterators</span></a></li>
<li class="toclevel-2"><a href="vector.html#Capacity"><span class="tocnumber">5.3</span> <span class="toctext">Capacity</span></a></li>
<li class="toclevel-2"><a href="vector.html#Modifiers"><span class="tocnumber">5.4</span> <span class="toctext">Modifiers</span></a></li>
</ul>
</li>
<li class="toclevel-1 tocsection-6"><a href="vector.html#Non-member_functions"><span class="tocnumber">6</span> <span class="toctext">Non-member functions</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/vector&action=edit&section=1" title="Edit section: Template parameters">edit</a>]</span> <span class="mw-headline" id="Template_parameters">Template parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> T
</td>
<td> -
</td>
<td> The type of the elements.
<table class="t-rev-begin">
<tr class="t-rev t-until-cxx11"><td> <code>T</code> must meet the requirements of <a href="../concept/CopyAssignable.html" title="cpp/concept/CopyAssignable"><code>CopyAssignable</code></a> and <a href="../concept/CopyConstructible.html" title="cpp/concept/CopyConstructible"><code>CopyConstructible</code></a>. </td>
<td><span class="t-mark-rev t-until-cxx11">(until C++11)</span></td></tr>
<tr class="t-rev t-since-cxx11 t-until-cxx17"><td> The requirements that are imposed on the elements depend on the actual operations performed on the container. Generally, it is required that element type is a complete type and meets the requirements of <a href="../concept/Eraseable.html" title="cpp/concept/Erasable"><code>Erasable</code></a>, but many member functions impose stricter requirements. </td>
<td><span class="t-mark-rev t-since-cxx11">(since C++11)</span><br /><span class="t-mark-rev t-until-cxx17">(until C++17)</span></td></tr>
<tr class="t-rev t-since-cxx17"><td>
The requirements that are imposed on the elements depend on the actual operations performed on the container. Generally, it is required that element type meets the requirements of <a href="../concept/Eraseable.html" title="cpp/concept/Erasable"><code>Erasable</code></a>, but many member functions impose stricter requirements. This container (but not its members) can be instantiated with an incomplete element type if the allocator satisfies the <a href="../concept/Allocator.html#Allocator_completeness_requirements" title="cpp/concept/Allocator">allocator completeness requirements</a>. </td>
<td><span class="t-mark-rev t-since-cxx17">(since C++17)</span></td></tr>
</table>
<p><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/param_list_T&action=edit">[edit]</a></span>
</p>
</td></tr>
<tr class="t-par">
<td> Allocator
</td>
<td> -
</td>
<td> An allocator that is used to acquire memory to store the elements. The type must meet the requirements of <a href="../concept/Allocator.html" title="cpp/concept/Allocator"><code>Allocator</code></a>. <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/param_list_Allocator&action=edit">[edit]</a></span>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/vector&action=edit&section=2" title="Edit section: Specializations">edit</a>]</span> <span class="mw-headline" id="Specializations">Specializations</span></h3>
<p>The standard library provides a specialization of <code>std::vector</code> for the type <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span>, which is optimized for space efficiency.
</p>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector_bool.html" title="cpp/container/vector bool"> <span class="t-lines"><span>vector<span class="t-dsc-small"><bool></span></span></span></a></div></div>
</td>
<td> space-efficient dynamic bitset <br /> <span class="t-mark">(class template specialization)</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_vector_bool&action=edit">[edit]</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/vector&action=edit&section=3" title="Edit section: Iterator invalidation">edit</a>]</span> <span class="mw-headline" id="Iterator_invalidation">Iterator invalidation</span></h3>
<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 </td></tr></table>
<p>There are still a few inaccuracies in this section. Refer to individual member function pages for more detail.
</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th> Operations
</th>
<th> Invalidated
</th></tr>
<tr>
<td> All read only operations, <span class="t-lc">swap</span>, <span class="t-lc">std::swap</span>
</td>
<td> Never
</td></tr>
<tr>
<td> <span class="t-lc">clear</span>, <span class="t-lc">operator=</span>
</td>
<td> Always
</td></tr>
<tr>
<td> <span class="t-lc">reserve</span>, <span class="t-lc">shrink_to_fit</span>
</td>
<td> If the vector changed capacity, all of them. If not, none.
</td></tr>
<tr>
<td> <span class="t-lc">erase</span>
</td>
<td> Erased elements + all elements after them (including <span class="t-lc">end()</span>)
</td></tr>
<tr>
<td> <span class="t-lc">push_back</span>, <span class="t-lc">emplace_back</span>
</td>
<td> If the vector changed capacity, all of them. If not, only end().
</td></tr>
<tr>
<td> <span class="t-lc">insert</span>, <span class="t-lc">emplace</span>, <span class="t-lc">resize</span>
</td>
<td> If the vector changed capacity, all of them. If not, only those after the insertion point.
</td></tr>
<tr>
<td> <span class="t-lc">pop_back</span>
</td>
<td> The element erased and <span class="t-lc">end()</span>.
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/vector&action=edit&section=4" title="Edit section: Member types">edit</a>]</span> <span class="mw-headline" id="Member_types">Member types</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc-hitem">
<td> Member type
</td>
<td> Definition
</td></tr>
<tr class="t-dsc">
<td> <code>value_type</code>
</td>
<td> <code>T</code> <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_value_type&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>allocator_type</code>
</td>
<td> <code>Allocator</code> <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_allocator_type&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>size_type</code>
</td>
<td> Unsigned integral type (usually <span class="t-lc">std::size_t</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_size_type&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>difference_type</code>
</td>
<td> Signed integer type (usually <span class="t-lc">std::ptrdiff_t</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_difference_type&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>reference</code>
</td>
<td> <table class="t-rev-begin t-rev-begin-noborder"><tr class="t-rev t-until-cxx11"><td><code>Allocator::reference</code></td>
<td><span class="t-mark-rev t-until-cxx11">(until C++11)</span></td></tr><tr class="t-rev t-since-cxx11"><td><code>value_type&</code></td>
<td><span class="t-mark-rev t-since-cxx11">(since C++11)</span></td></tr></table> <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_reference&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>const_reference</code>
</td>
<td> <table class="t-rev-begin t-rev-begin-noborder"><tr class="t-rev t-until-cxx11"><td><code>Allocator::const_reference</code></td>
<td><span class="t-mark-rev t-until-cxx11">(until C++11)</span></td></tr><tr class="t-rev t-since-cxx11"><td><code>const value_type&</code></td>
<td><span class="t-mark-rev t-since-cxx11">(since C++11)</span></td></tr></table> <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_const_reference&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>pointer</code>
</td>
<td> <table class="t-rev-begin t-rev-begin-noborder"><tr class="t-rev t-until-cxx11"><td><code>Allocator::pointer</code></td>
<td><span class="t-mark-rev t-until-cxx11">(until C++11)</span></td></tr><tr class="t-rev t-since-cxx11"><td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../memory/allocator_traits.html"><span class="kw602">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>Allocator<span class="sy1">></span><span class="sy4">::</span><span class="me2">pointer</span></span></span></td>
<td><span class="t-mark-rev t-since-cxx11">(since C++11)</span></td></tr></table> <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_pointer&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>const_pointer</code>
</td>
<td> <table class="t-rev-begin t-rev-begin-noborder"><tr class="t-rev t-until-cxx11"><td><code>Allocator::const_pointer</code></td>
<td><span class="t-mark-rev t-until-cxx11">(until C++11)</span></td></tr><tr class="t-rev t-since-cxx11"><td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../memory/allocator_traits.html"><span class="kw602">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>Allocator<span class="sy1">></span><span class="sy4">::</span><span class="me2">const_pointer</span></span></span></td>
<td><span class="t-mark-rev t-since-cxx11">(since C++11)</span></td></tr></table> <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_const_pointer&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>iterator</code>
</td>
<td> <a href="../concept/RandomAccessIterator.html" title="cpp/concept/RandomAccessIterator"><code>RandomAccessIterator</code></a> <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_iterator&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>const_iterator</code>
</td>
<td> Constant random access iterator <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_const_iterator&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>reverse_iterator</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../iterator/reverse_iterator.html"><span class="kw564">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1"><</span>iterator<span class="sy1">></span></span></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_reverse_iterator&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <code>const_reverse_iterator</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../iterator/reverse_iterator.html"><span class="kw564">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1"><</span>const_iterator<span class="sy1">></span></span></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_const_reverse_iterator&action=edit">[edit]</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/vector&action=edit&section=5" title="Edit section: Member functions">edit</a>]</span> <span class="mw-headline" id="Member_functions">Member functions</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="vector/vector.html" title="cpp/container/vector/vector"> <span class="t-lines"><span>(constructor)</span></span></a></div></div>
</td>
<td> constructs the <code>vector</code> <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_constructor&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="vector/~vector.html" title="cpp/container/vector/~vector"> <span class="t-lines"><span>(destructor)</span></span></a></div></div>
</td>
<td> destructs the <code>vector</code> <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_destructor&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/operator=.html" title="cpp/container/vector/operator="> <span class="t-lines"><span>operator=</span></span></a></div></div>
</td>
<td> assigns values to the container <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_operator%3D&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/assign.html" title="cpp/container/vector/assign"> <span class="t-lines"><span>assign</span></span></a></div></div>
</td>
<td> assigns values to the container <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_assign&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/get_allocator.html" title="cpp/container/vector/get allocator"> <span class="t-lines"><span>get_allocator</span></span></a></div></div>
</td>
<td> returns the associated allocator <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_get_allocator&action=edit">[edit]</a></span>
</td></tr>
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Element_access"> Element access </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/at.html" title="cpp/container/vector/at"> <span class="t-lines"><span>at</span></span></a></div></div>
</td>
<td> access specified element with bounds checking <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_at&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/operator_at.html" title="cpp/container/vector/operator at"> <span class="t-lines"><span>operator[]</span></span></a></div></div>
</td>
<td> access specified element <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_operator_at&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/front.html" title="cpp/container/vector/front"> <span class="t-lines"><span>front</span></span></a></div></div>
</td>
<td> access the first element <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_front&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/back.html" title="cpp/container/vector/back"> <span class="t-lines"><span>back</span></span></a></div></div>
</td>
<td> access the last element <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_back&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/data.html" title="cpp/container/vector/data"> <span class="t-lines"><span>data</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> direct access to the underlying array <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_data&action=edit">[edit]</a></span>
</td></tr>
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Iterators"> Iterators </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/begin.html" title="cpp/container/vector/begin"> <span class="t-lines"><span>begin</span><span> cbegin</span></span></a></div><div><span class="t-lines"><span></span><span></span></span></div></div>
</td>
<td> returns an iterator to the beginning <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_begin&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/end.html" title="cpp/container/vector/end"> <span class="t-lines"><span>end </span><span>cend</span></span></a></div><div><span class="t-lines"><span></span><span></span></span></div></div>
</td>
<td> returns an iterator to the end <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_end&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/rbegin.html" title="cpp/container/vector/rbegin"> <span class="t-lines"><span>rbegin</span><span> crbegin</span></span></a></div><div><span class="t-lines"><span></span><span></span></span></div></div>
</td>
<td> returns a reverse iterator to the beginning <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_rbegin&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/rend.html" title="cpp/container/vector/rend"> <span class="t-lines"><span>rend</span><span> crend</span></span></a></div><div><span class="t-lines"><span></span><span></span></span></div></div>
</td>
<td> returns a reverse iterator to the end <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_rend&action=edit">[edit]</a></span>
</td></tr>
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Capacity"> Capacity </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/empty.html" title="cpp/container/vector/empty"> <span class="t-lines"><span>empty</span></span></a></div></div>
</td>
<td> checks whether the container is empty <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_empty&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/size.html" title="cpp/container/vector/size"> <span class="t-lines"><span>size</span></span></a></div></div>
</td>
<td> returns the number of elements <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_size&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/max_size.html" title="cpp/container/vector/max size"> <span class="t-lines"><span>max_size</span></span></a></div></div>
</td>
<td> returns the maximum possible number of elements <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_max_size&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/reserve.html" title="cpp/container/vector/reserve"> <span class="t-lines"><span>reserve</span></span></a></div></div>
</td>
<td> reserves storage <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_reserve&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/capacity.html" title="cpp/container/vector/capacity"> <span class="t-lines"><span>capacity</span></span></a></div></div>
</td>
<td> returns the number of elements that can be held in currently allocated storage <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_capacity&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/shrink_to_fit.html" title="cpp/container/vector/shrink to fit"> <span class="t-lines"><span>shrink_to_fit</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> reduces memory usage by freeing unused memory <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_shrink_to_fit&action=edit">[edit]</a></span>
</td></tr>
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Modifiers"> Modifiers </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/clear.html" title="cpp/container/vector/clear"> <span class="t-lines"><span>clear</span></span></a></div></div>
</td>
<td> clears the contents <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_clear&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/insert.html" title="cpp/container/vector/insert"> <span class="t-lines"><span>insert</span></span></a></div></div>
</td>
<td> inserts elements <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_insert&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/emplace.html" title="cpp/container/vector/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="vector/erase.html" title="cpp/container/vector/erase"> <span class="t-lines"><span>erase</span></span></a></div></div>
</td>
<td> erases elements <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_erase&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/push_back.html" title="cpp/container/vector/push back"> <span class="t-lines"><span>push_back</span></span></a></div></div>
</td>
<td> adds an element to the end <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_push_back&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/emplace_back.html" title="cpp/container/vector/emplace back"> <span class="t-lines"><span>emplace_back</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 an element in-place at the end <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_back&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/pop_back.html" title="cpp/container/vector/pop back"> <span class="t-lines"><span>pop_back</span></span></a></div></div>
</td>
<td> removes the last element <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_pop_back&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/resize.html" title="cpp/container/vector/resize"> <span class="t-lines"><span>resize</span></span></a></div></div>
</td>
<td> changes the number of elements stored <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_resize&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/swap.html" title="cpp/container/vector/swap"> <span class="t-lines"><span>swap</span></span></a></div></div>
</td>
<td> swaps the contents <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_swap&action=edit">[edit]</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/container/vector&action=edit&section=6" title="Edit section: Non-member functions">edit</a>]</span> <span class="mw-headline" id="Non-member_functions">Non-member functions</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vector/operator_cmp.html" title="cpp/container/vector/operator cmp"> <span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator<</span><span>operator<=</span><span>operator></span><span>operator>=</span></span></a></div></div>
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<td> lexicographically compares the values in the vector <br /> <span class="t-mark">(function template)</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_operator_cmp&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="vector/swap2.html" title="cpp/container/vector/swap2"> <span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::vector)</span></span></span></a></div></div>
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<td> specializes the <span class="t-lc">std::swap</span> algorithm <br /> <span class="t-mark">(function template)</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_swap2&action=edit">[edit]</a></span>
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