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<div class="title">std::shared_ptr< _Tp > Class Template Reference<div class="ingroups"><a class="el" href="a01480.html">Utilities</a> » <a class="el" href="a01474.html">Memory</a> » <a class="el" href="a01475.html">Pointer Abstractions</a></div></div> </div>
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<p>Inherits std::__shared_ptr< _Tp, _Lp >.</p>
<table class="memberdecls">
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Public Types</h2></td></tr>
<tr class="memitem:a0ae1e5a58059d8174de6d5a131ad6963"><td class="memItemLeft" align="right" valign="top"><a id="a0ae1e5a58059d8174de6d5a131ad6963"></a>
using </td><td class="memItemRight" valign="bottom"><b>element_type</b> = typename __shared_ptr< _Tp >::element_type</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a4497f1d5421073bd8c1ee305414c4e80"><td class="memItemLeft" align="right" valign="top">constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="a06851.html#a4497f1d5421073bd8c1ee305414c4e80">shared_ptr</a> () noexcept</td></tr>
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<tr class="memitem:a4aa51bb3efd3e84d08d1649e5e242725"><td class="memItemLeft" align="right" valign="top"><a id="a4aa51bb3efd3e84d08d1649e5e242725"></a>
 </td><td class="memItemRight" valign="bottom"><b>shared_ptr</b> (const <a class="el" href="a06851.html">shared_ptr</a> &) noexcept=default</td></tr>
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<tr class="memitem:a7752bdf2d4dc3f4f5719fd05f2d92089"><td class="memTemplParams" colspan="2">template<typename _Yp , typename = _Constructible<_Yp*>> </td></tr>
<tr class="memitem:a7752bdf2d4dc3f4f5719fd05f2d92089"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06851.html#a7752bdf2d4dc3f4f5719fd05f2d92089">shared_ptr</a> (_Yp *__p)</td></tr>
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<tr class="memitem:a8b115d3d42304820c9942ddeb58644ee"><td class="memTemplParams" colspan="2">template<typename _Yp , typename _Deleter , typename = _Constructible<_Yp*, _Deleter>> </td></tr>
<tr class="memitem:a8b115d3d42304820c9942ddeb58644ee"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06851.html#a8b115d3d42304820c9942ddeb58644ee">shared_ptr</a> (_Yp *__p, _Deleter __d)</td></tr>
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<tr class="memitem:a893642e27fcab50317ba7d91392c0871"><td class="memTemplParams" colspan="2">template<typename _Deleter > </td></tr>
<tr class="memitem:a893642e27fcab50317ba7d91392c0871"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06851.html#a893642e27fcab50317ba7d91392c0871">shared_ptr</a> (nullptr_t __p, _Deleter __d)</td></tr>
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<tr class="memitem:a2b1f604b01d6faf7ed627624968e76b8"><td class="memTemplParams" colspan="2">template<typename _Yp , typename _Deleter , typename _Alloc , typename = _Constructible<_Yp*, _Deleter, _Alloc>> </td></tr>
<tr class="memitem:a2b1f604b01d6faf7ed627624968e76b8"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06851.html#a2b1f604b01d6faf7ed627624968e76b8">shared_ptr</a> (_Yp *__p, _Deleter __d, _Alloc __a)</td></tr>
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<tr class="memitem:a124c2b4fe2cd0d7651eefd22ead8f2ec"><td class="memTemplParams" colspan="2">template<typename _Deleter , typename _Alloc > </td></tr>
<tr class="memitem:a124c2b4fe2cd0d7651eefd22ead8f2ec"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06851.html#a124c2b4fe2cd0d7651eefd22ead8f2ec">shared_ptr</a> (nullptr_t __p, _Deleter __d, _Alloc __a)</td></tr>
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<tr class="memitem:a9c6e4362646c04f78bbaf043f90eb835"><td class="memTemplParams" colspan="2">template<typename _Yp > </td></tr>
<tr class="memitem:a9c6e4362646c04f78bbaf043f90eb835"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06851.html#a9c6e4362646c04f78bbaf043f90eb835">shared_ptr</a> (const <a class="el" href="a06851.html">shared_ptr</a>< _Yp > &__r, element_type *__p) noexcept</td></tr>
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<tr class="memitem:a1dad8483fa6f0d7507549bb8200c4de9"><td class="memTemplParams" colspan="2">template<typename _Yp , typename = _Constructible<const shared_ptr<_Yp>&>> </td></tr>
<tr class="memitem:a1dad8483fa6f0d7507549bb8200c4de9"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06851.html#a1dad8483fa6f0d7507549bb8200c4de9">shared_ptr</a> (const <a class="el" href="a06851.html">shared_ptr</a>< _Yp > &__r) noexcept</td></tr>
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<tr class="memitem:a5bd9976c3d66cf2a62904ebaeeab76e6"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="a06851.html#a5bd9976c3d66cf2a62904ebaeeab76e6">shared_ptr</a> (<a class="el" href="a06851.html">shared_ptr</a> &&__r) noexcept</td></tr>
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<tr class="memitem:a21c103ae1494cc05477bd22ec5c284fc"><td class="memTemplParams" colspan="2">template<typename _Yp , typename = _Constructible<shared_ptr<_Yp>>> </td></tr>
<tr class="memitem:a21c103ae1494cc05477bd22ec5c284fc"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06851.html#a21c103ae1494cc05477bd22ec5c284fc">shared_ptr</a> (<a class="el" href="a06851.html">shared_ptr</a>< _Yp > &&__r) noexcept</td></tr>
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<tr class="memitem:aaab9ea5e4dc2ab2b17b5a25cd1b58cf3"><td class="memTemplParams" colspan="2">template<typename _Yp , typename = _Constructible<const weak_ptr<_Yp>&>> </td></tr>
<tr class="memitem:aaab9ea5e4dc2ab2b17b5a25cd1b58cf3"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06851.html#aaab9ea5e4dc2ab2b17b5a25cd1b58cf3">shared_ptr</a> (const <a class="el" href="a06859.html">weak_ptr</a>< _Yp > &__r)</td></tr>
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template<typename _Yp , typename _Del , typename = _Constructible<unique_ptr<_Yp, _Del>>> </td></tr>
<tr class="memitem:a9a71f64b7595c9ac466b31e1562f7176"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><b>shared_ptr</b> (<a class="el" href="a07967.html">unique_ptr</a>< _Yp, _Del > &&__r)</td></tr>
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<tr class="memitem:ac924c816f979c01f5adc42407b2fac83"><td class="memItemLeft" align="right" valign="top">constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="a06851.html#ac924c816f979c01f5adc42407b2fac83">shared_ptr</a> (nullptr_t) noexcept</td></tr>
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template<typename _Tp1 , typename > </td></tr>
<tr class="memitem:a6157d1b200aad1e5b433c58b991b41c0"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><b>shared_ptr</b> (<a class="el" href="a08455.html">std::auto_ptr</a>< _Tp1 > &&__r)</td></tr>
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element_type * </td><td class="memItemRight" valign="bottom"><b>get</b> () const noexcept</td></tr>
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 </td><td class="memItemRight" valign="bottom"><b>operator bool</b> () const</td></tr>
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element_type & </td><td class="memItemRight" valign="bottom"><b>operator*</b> () const noexcept</td></tr>
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element_type * </td><td class="memItemRight" valign="bottom"><b>operator-></b> () const noexcept</td></tr>
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<a class="el" href="a06851.html">shared_ptr</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="a06851.html">shared_ptr</a> &) noexcept=default</td></tr>
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template<typename _Yp > </td></tr>
<tr class="memitem:a5f83f1b5aaa64ff507cfa5599eada096"><td class="memTemplItemLeft" align="right" valign="top">_Assignable< const <a class="el" href="a06851.html">shared_ptr</a>< _Yp > & > </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="a06851.html">shared_ptr</a>< _Yp > &__r) noexcept</td></tr>
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<a class="el" href="a06851.html">shared_ptr</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="a06851.html">shared_ptr</a> &&__r) noexcept</td></tr>
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template<class _Yp > </td></tr>
<tr class="memitem:a2d4c5d7e5c056aae51731b8b9ed1f231"><td class="memTemplItemLeft" align="right" valign="top">_Assignable< <a class="el" href="a06851.html">shared_ptr</a>< _Yp > > </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="a06851.html">shared_ptr</a>< _Yp > &&__r) noexcept</td></tr>
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template<typename _Yp , typename _Del > </td></tr>
<tr class="memitem:aee3a2989df26f01990a8ba76613ecec0"><td class="memTemplItemLeft" align="right" valign="top">_Assignable< <a class="el" href="a07967.html">unique_ptr</a>< _Yp, _Del > > </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="a07967.html">unique_ptr</a>< _Yp, _Del > &&__r)</td></tr>
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template<typename _Tp1 > </td></tr>
<tr class="memitem:aeac4131cdeb4508cb3cc5e444025dd13"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>owner_before</b> (__shared_ptr< _Tp1, _Lp > const &__rhs) const noexcept</td></tr>
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template<typename _Tp1 > </td></tr>
<tr class="memitem:aad0f29a64914eedc229d106af794b3d5"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>owner_before</b> (__weak_ptr< _Tp1, _Lp > const &__rhs) const noexcept</td></tr>
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void </td><td class="memItemRight" valign="bottom"><b>reset</b> () noexcept</td></tr>
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template<typename _Yp > </td></tr>
<tr class="memitem:ac1ac94beb595729733528b6f4173b70f"><td class="memTemplItemLeft" align="right" valign="top">_SafeConv< _Yp > </td><td class="memTemplItemRight" valign="bottom"><b>reset</b> (_Yp *__p)</td></tr>
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template<typename _Yp , typename _Deleter > </td></tr>
<tr class="memitem:a669d92df05c072935636fc1d15d9bc55"><td class="memTemplItemLeft" align="right" valign="top">_SafeConv< _Yp > </td><td class="memTemplItemRight" valign="bottom"><b>reset</b> (_Yp *__p, _Deleter __d)</td></tr>
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template<typename _Yp , typename _Deleter , typename _Alloc > </td></tr>
<tr class="memitem:a278a6f9a03de0af166d82b82a43ee00f"><td class="memTemplItemLeft" align="right" valign="top">_SafeConv< _Yp > </td><td class="memTemplItemRight" valign="bottom"><b>reset</b> (_Yp *__p, _Deleter __d, _Alloc __a)</td></tr>
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void </td><td class="memItemRight" valign="bottom"><b>swap</b> (__shared_ptr< _Tp, _Lp > &__other) noexcept</td></tr>
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bool </td><td class="memItemRight" valign="bottom"><b>unique</b> () const noexcept</td></tr>
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long </td><td class="memItemRight" valign="bottom"><b>use_count</b> () const noexcept</td></tr>
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Friends</h2></td></tr>
<tr class="memitem:aae3d23f345adfb0284614b4d1bfdd7b3"><td class="memTemplParams" colspan="2">template<typename _Yp , typename _Alloc , typename... _Args> </td></tr>
<tr class="memitem:aae3d23f345adfb0284614b4d1bfdd7b3"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a06851.html">shared_ptr</a>< _Yp > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06851.html#aae3d23f345adfb0284614b4d1bfdd7b3">allocate_shared</a> (const _Alloc &__a, _Args &&... __args)</td></tr>
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class </td><td class="memItemRight" valign="bottom"><b>weak_ptr< _Tp ></b></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<typename _Tp><br />
class std::shared_ptr< _Tp ></h3>
<p>A smart pointer with reference-counted copy semantics. </p>
<p>The object pointed to is deleted when the last shared_ptr pointing to it is destroyed or reset. </p>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00103">103</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">constexpr <a class="el" href="a06851.html">std::shared_ptr</a>< _Tp >::<a class="el" href="a06851.html">shared_ptr</a> </td>
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<p>Construct an empty shared_ptr. </p>
<dl class="section post"><dt>Postcondition</dt><dd>use_count()==0 && get()==0 </dd></dl>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00127">127</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<td class="memname"><a class="el" href="a06851.html">std::shared_ptr</a>< _Tp >::<a class="el" href="a06851.html">shared_ptr</a> </td>
<td>(</td>
<td class="paramtype">_Yp * </td>
<td class="paramname"><em>__p</em></td><td>)</td>
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<p>Construct a shared_ptr that owns the pointer <em>__p</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__p</td><td>A pointer that is convertible to element_type*. </td></tr>
</table>
</dd>
</dl>
<dl class="section post"><dt>Postcondition</dt><dd>use_count() == 1 && get() == __p </dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">std::bad_alloc,in</td><td>which case <code>delete</code> <em>__p</em> is called. </td></tr>
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</dd>
</dl>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00139">139</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<td>(</td>
<td class="paramtype">_Yp * </td>
<td class="paramname"><em>__p</em>, </td>
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<td class="paramname"><em>__d</em> </td>
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<p>Construct a shared_ptr that owns the pointer <em>__p</em> and the deleter <em>__d</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__p</td><td>A pointer. </td></tr>
<tr><td class="paramname">__d</td><td>A deleter. </td></tr>
</table>
</dd>
</dl>
<dl class="section post"><dt>Postcondition</dt><dd>use_count() == 1 && get() == __p </dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">std::bad_alloc,in</td><td>which case <em>__d(__p)</em> is called.</td></tr>
</table>
</dd>
</dl>
<p>Requirements: _Deleter's copy constructor and destructor must not throw</p>
<p>__shared_ptr will release __p by calling __d(__p) </p>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00156">156</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<td class="paramname"><em>__p</em>, </td>
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<td class="paramname"><em>__d</em> </td>
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<p>Construct a shared_ptr that owns a null pointer and the deleter <em>__d</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__p</td><td>A null pointer constant. </td></tr>
<tr><td class="paramname">__d</td><td>A deleter. </td></tr>
</table>
</dd>
</dl>
<dl class="section post"><dt>Postcondition</dt><dd>use_count() == 1 && get() == __p </dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">std::bad_alloc,in</td><td>which case <em>__d(__p)</em> is called.</td></tr>
</table>
</dd>
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<p>Requirements: _Deleter's copy constructor and destructor must not throw</p>
<p>The last owner will call __d(__p) </p>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00173">173</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<td class="paramname"><em>__a</em> </td>
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<p>Construct a shared_ptr that owns the pointer <em>__p</em> and the deleter <em>__d</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__p</td><td>A pointer. </td></tr>
<tr><td class="paramname">__d</td><td>A deleter. </td></tr>
<tr><td class="paramname">__a</td><td>An allocator. </td></tr>
</table>
</dd>
</dl>
<dl class="section post"><dt>Postcondition</dt><dd>use_count() == 1 && get() == __p </dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">std::bad_alloc,in</td><td>which case <em>__d(__p)</em> is called.</td></tr>
</table>
</dd>
</dl>
<p>Requirements: _Deleter's copy constructor and destructor must not throw _Alloc's copy constructor and destructor must not throw.</p>
<p>__shared_ptr will release __p by calling __d(__p) </p>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00193">193</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<td>(</td>
<td class="paramtype">nullptr_t </td>
<td class="paramname"><em>__p</em>, </td>
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<td class="paramname"><em>__d</em>, </td>
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<p>Construct a shared_ptr that owns a null pointer and the deleter <em>__d</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__p</td><td>A null pointer constant. </td></tr>
<tr><td class="paramname">__d</td><td>A deleter. </td></tr>
<tr><td class="paramname">__a</td><td>An allocator. </td></tr>
</table>
</dd>
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<dl class="section post"><dt>Postcondition</dt><dd>use_count() == 1 && get() == __p </dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">std::bad_alloc,in</td><td>which case <em>__d(__p)</em> is called.</td></tr>
</table>
</dd>
</dl>
<p>Requirements: _Deleter's copy constructor and destructor must not throw _Alloc's copy constructor and destructor must not throw.</p>
<p>The last owner will call __d(__p) </p>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00212">212</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<p>Constructs a shared_ptr instance that stores <em>__p</em> and shares ownership with <em>__r</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__r</td><td>A shared_ptr. </td></tr>
<tr><td class="paramname">__p</td><td>A pointer that will remain valid while <em>*__r</em> is valid. </td></tr>
</table>
</dd>
</dl>
<dl class="section post"><dt>Postcondition</dt><dd>get() == __p && use_count() == __r.use_count()</dd></dl>
<p>This can be used to construct a <code>shared_ptr</code> to a sub-object of an object managed by an existing <code>shared_ptr</code>.</p>
<div class="fragment"><div class="line">shared_ptr< pair<int,int> > pii(<span class="keyword">new</span> pair<int,int>());</div><div class="line">shared_ptr<int> pi(pii, &pii->first);</div><div class="line">assert(pii.use_count() == 2);</div></div><!-- fragment -->
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00234">234</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<td class="paramtype">const <a class="el" href="a06851.html">shared_ptr</a>< _Yp > & </td>
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<p>If <em>__r</em> is empty, constructs an empty shared_ptr; otherwise construct a shared_ptr that shares ownership with <em>__r</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__r</td><td>A shared_ptr. </td></tr>
</table>
</dd>
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<dl class="section post"><dt>Postcondition</dt><dd>get() == __r.get() && use_count() == __r.use_count() </dd></dl>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00246">246</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<p>Move-constructs a shared_ptr instance from <em>__r</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__r</td><td>A shared_ptr rvalue. </td></tr>
</table>
</dd>
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<dl class="section post"><dt>Postcondition</dt><dd>*this contains the old value of <em>__r</em>, <em>__r</em> is empty. </dd></dl>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00254">254</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">noexcept</span></span> </td>
</tr>
</table>
</div><div class="memdoc">
<p>Move-constructs a shared_ptr instance from <em>__r</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__r</td><td>A shared_ptr rvalue. </td></tr>
</table>
</dd>
</dl>
<dl class="section post"><dt>Postcondition</dt><dd>*this contains the old value of <em>__r</em>, <em>__r</em> is empty. </dd></dl>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00263">263</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<a id="aaab9ea5e4dc2ab2b17b5a25cd1b58cf3"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aaab9ea5e4dc2ab2b17b5a25cd1b58cf3">◆ </a></span>shared_ptr() <span class="overload">[11/12]</span></h2>
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template<typename _Tp> </div>
<div class="memtemplate">
template<typename _Yp , typename = _Constructible<const weak_ptr<_Yp>&>> </div>
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<td class="memname"><a class="el" href="a06851.html">std::shared_ptr</a>< _Tp >::<a class="el" href="a06851.html">shared_ptr</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="a06859.html">weak_ptr</a>< _Yp > & </td>
<td class="paramname"><em>__r</em></td><td>)</td>
<td></td>
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</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">explicit</span></span> </td>
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<p>Constructs a shared_ptr that shares ownership with <em>__r</em> and stores a copy of the pointer stored in <em>__r</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__r</td><td>A weak_ptr. </td></tr>
</table>
</dd>
</dl>
<dl class="section post"><dt>Postcondition</dt><dd>use_count() == __r.use_count() </dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">bad_weak_ptr</td><td>when __r.expired(), in which case the constructor has no effect. </td></tr>
</table>
</dd>
</dl>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00275">275</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<a id="ac924c816f979c01f5adc42407b2fac83"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac924c816f979c01f5adc42407b2fac83">◆ </a></span>shared_ptr() <span class="overload">[12/12]</span></h2>
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<div class="memtemplate">
template<typename _Tp> </div>
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<td class="memname">constexpr <a class="el" href="a06851.html">std::shared_ptr</a>< _Tp >::<a class="el" href="a06851.html">shared_ptr</a> </td>
<td>(</td>
<td class="paramtype">nullptr_t </td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">noexcept</span></span> </td>
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<p>Construct an empty shared_ptr. </p>
<dl class="section post"><dt>Postcondition</dt><dd>use_count() == 0 && get() == nullptr </dd></dl>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00307">307</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
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<h2 class="groupheader">Friends And Related Function Documentation</h2>
<a id="aae3d23f345adfb0284614b4d1bfdd7b3"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aae3d23f345adfb0284614b4d1bfdd7b3">◆ </a></span>allocate_shared</h2>
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template<typename _Tp> </div>
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template<typename _Yp , typename _Alloc , typename... _Args> </div>
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<td class="memname"><a class="el" href="a06851.html">shared_ptr</a><_Yp> allocate_shared </td>
<td>(</td>
<td class="paramtype">const _Alloc & </td>
<td class="paramname"><em>__a</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">_Args &&... </td>
<td class="paramname"><em>__args</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">friend</span></span> </td>
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<p>Create an object that is owned by a shared_ptr. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__a</td><td>An allocator. </td></tr>
<tr><td class="paramname">__args</td><td>Arguments for the <em>_Tp</em> object's constructor. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>A shared_ptr that owns the newly created object. </dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">An</td><td>exception thrown from <em>_Alloc::allocate</em> or from the constructor of <em>_Tp</em>.</td></tr>
</table>
</dd>
</dl>
<p>A copy of <em>__a</em> will be used to allocate memory for the shared_ptr and the new object. </p>
<p class="definition">Definition at line <a class="el" href="a17112_source.html#l00703">703</a> of file <a class="el" href="a17112_source.html">bits/shared_ptr.h</a>.</p>
</div>
</div>
<hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="a17112_source.html">bits/shared_ptr.h</a></li>
<li><a class="el" href="a00722_source.html">auto_ptr.h</a></li>
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