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<div class="title">std::shared_ptr< _Tp > Class Template Reference<div class="ingroups"><a class="el" href="a01431.html">Utilities</a> » <a class="el" href="a01424.html">Memory</a> » <a class="el" href="a01425.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:a1eee1ee525570d0af8680d4832ffdcf2"><td class="memItemLeft" align="right" valign="top"><a id="a1eee1ee525570d0af8680d4832ffdcf2"></a>
typedef _Tp </td><td class="memItemRight" valign="bottom"><b>element_type</b></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="a06085.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="a06085.html">shared_ptr</a> &) noexcept=default</td></tr>
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<tr class="memitem:a8f01a63a6523e06bd14ca2640df0304b"><td class="memTemplParams" colspan="2">template<typename _Tp1 > </td></tr>
<tr class="memitem:a8f01a63a6523e06bd14ca2640df0304b"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06085.html#a8f01a63a6523e06bd14ca2640df0304b">shared_ptr</a> (_Tp1 *__p)</td></tr>
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<tr class="memitem:a895b22022dd56268a48e56c5ab8a8514"><td class="memTemplParams" colspan="2">template<typename _Tp1 , typename _Deleter > </td></tr>
<tr class="memitem:a895b22022dd56268a48e56c5ab8a8514"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06085.html#a895b22022dd56268a48e56c5ab8a8514">shared_ptr</a> (_Tp1 *__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="a06085.html#a893642e27fcab50317ba7d91392c0871">shared_ptr</a> (nullptr_t __p, _Deleter __d)</td></tr>
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<tr class="memitem:a122eda1d6a1334984e5af9b6bda8c5d0"><td class="memTemplParams" colspan="2">template<typename _Tp1 , typename _Deleter , typename _Alloc > </td></tr>
<tr class="memitem:a122eda1d6a1334984e5af9b6bda8c5d0"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06085.html#a122eda1d6a1334984e5af9b6bda8c5d0">shared_ptr</a> (_Tp1 *__p, _Deleter __d, _Alloc __a)</td></tr>
<tr class="separator:a122eda1d6a1334984e5af9b6bda8c5d0"><td class="memSeparator" colspan="2"> </td></tr>
<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="a06085.html#a124c2b4fe2cd0d7651eefd22ead8f2ec">shared_ptr</a> (nullptr_t __p, _Deleter __d, _Alloc __a)</td></tr>
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<tr class="memitem:ab6baafde6e6e3f19bd340cba40f27ce9"><td class="memTemplParams" colspan="2">template<typename _Tp1 > </td></tr>
<tr class="memitem:ab6baafde6e6e3f19bd340cba40f27ce9"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06085.html#ab6baafde6e6e3f19bd340cba40f27ce9">shared_ptr</a> (const <a class="el" href="a06085.html">shared_ptr</a>< _Tp1 > &__r, _Tp *__p) noexcept</td></tr>
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<tr class="memitem:ae9abaf1f9f6dc8520d944393ce5c1cb4"><td class="memTemplParams" colspan="2">template<typename _Tp1 , typename = _Convertible<_Tp1*>> </td></tr>
<tr class="memitem:ae9abaf1f9f6dc8520d944393ce5c1cb4"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06085.html#ae9abaf1f9f6dc8520d944393ce5c1cb4">shared_ptr</a> (const <a class="el" href="a06085.html">shared_ptr</a>< _Tp1 > &__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="a06085.html#a5bd9976c3d66cf2a62904ebaeeab76e6">shared_ptr</a> (<a class="el" href="a06085.html">shared_ptr</a> &&__r) noexcept</td></tr>
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<tr class="memitem:acdd91ba16894dee2f4c56f5749f09806"><td class="memTemplParams" colspan="2">template<typename _Tp1 , typename = _Convertible<_Tp1*>> </td></tr>
<tr class="memitem:acdd91ba16894dee2f4c56f5749f09806"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06085.html#acdd91ba16894dee2f4c56f5749f09806">shared_ptr</a> (<a class="el" href="a06085.html">shared_ptr</a>< _Tp1 > &&__r) noexcept</td></tr>
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<tr class="memitem:a1f2fd0c30fae162c2028b4ef0f7647dd"><td class="memTemplParams" colspan="2">template<typename _Tp1 > </td></tr>
<tr class="memitem:a1f2fd0c30fae162c2028b4ef0f7647dd"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06085.html#a1f2fd0c30fae162c2028b4ef0f7647dd">shared_ptr</a> (const <a class="el" href="a06093.html">weak_ptr</a>< _Tp1 > &__r)</td></tr>
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template<typename _Tp1 , typename _Del , typename = _Convertible<typename unique_ptr<_Tp1, _Del>::pointer>> </td></tr>
<tr class="memitem:a960b939edd1a322e68266c04fd745aa9"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><b>shared_ptr</b> (<a class="el" href="a06853.html">std::unique_ptr</a>< _Tp1, _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="a06085.html#ac924c816f979c01f5adc42407b2fac83">shared_ptr</a> (nullptr_t) noexcept</td></tr>
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template<typename _Tp1 > </td></tr>
<tr class="memitem:a92021cb4a5d2a37d9e9dafb665b92868"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><b>shared_ptr</b> (<a class="el" href="a07325.html">std::auto_ptr</a>< _Tp1 > &&__r)</td></tr>
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<tr class="memitem:ae894ad6e167a43ad7263eb4422cbb9a5"><td class="memItemLeft" align="right" valign="top"><a id="ae894ad6e167a43ad7263eb4422cbb9a5"></a>
_Tp * </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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std::add_lvalue_reference< _Tp >::type </td><td class="memItemRight" valign="bottom"><b>operator*</b> () const noexcept</td></tr>
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<tr class="memitem:ae35e96f622e3497eb6580b0e8d1a1a5a"><td class="memItemLeft" align="right" valign="top"><a id="ae35e96f622e3497eb6580b0e8d1a1a5a"></a>
_Tp * </td><td class="memItemRight" valign="bottom"><b>operator-></b> () const noexcept</td></tr>
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<a class="el" href="a06085.html">shared_ptr</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="a06085.html">shared_ptr</a> &) noexcept=default</td></tr>
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template<typename _Tp1 > </td></tr>
<tr class="memitem:ad08721f3ccd65456b40814007ff2bdc1"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a06085.html">shared_ptr</a> & </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="a06085.html">shared_ptr</a>< _Tp1 > &__r) noexcept</td></tr>
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<a class="el" href="a06085.html">shared_ptr</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="a06085.html">shared_ptr</a> &&__r) noexcept</td></tr>
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template<class _Tp1 > </td></tr>
<tr class="memitem:aedc0f64eab937e93aa06ba69eff49844"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a06085.html">shared_ptr</a> & </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="a06085.html">shared_ptr</a>< _Tp1 > &&__r) noexcept</td></tr>
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template<typename _Tp1 , typename _Del > </td></tr>
<tr class="memitem:a1b5ccb199bc0d1041058b94498ec5c06"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a06085.html">shared_ptr</a> & </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="a06853.html">std::unique_ptr</a>< _Tp1, _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 _Tp1 > </td></tr>
<tr class="memitem:a04de0ad10a0cccda6c77160fe81a1f06"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><b>reset</b> (_Tp1 *__p)</td></tr>
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template<typename _Tp1 , typename _Deleter > </td></tr>
<tr class="memitem:aa557dffc479b864bb7ab8cb7b89028eb"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><b>reset</b> (_Tp1 *__p, _Deleter __d)</td></tr>
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template<typename _Tp1 , typename _Deleter , typename _Alloc > </td></tr>
<tr class="memitem:ac2a4e0e2d2c44e86c4e25ea4b7470938"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><b>reset</b> (_Tp1 *__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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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="friends"></a>
Friends</h2></td></tr>
<tr class="memitem:a77b51f20fa9bcc07477ddf4843e7a8e4"><td class="memTemplParams" colspan="2">template<typename _Tp1 , typename _Alloc , typename... _Args> </td></tr>
<tr class="memitem:a77b51f20fa9bcc07477ddf4843e7a8e4"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a06085.html">shared_ptr</a>< _Tp1 > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06085.html#a77b51f20fa9bcc07477ddf4843e7a8e4">allocate_shared</a> (const _Alloc &__a, _Args &&... __args)</td></tr>
<tr class="separator:a77b51f20fa9bcc07477ddf4843e7a8e4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5e1bc0d904f3a9244016847e7d0316e1"><td class="memItemLeft" align="right" valign="top"><a id="a5e1bc0d904f3a9244016847e7d0316e1"></a>
class </td><td class="memItemRight" valign="bottom"><b>weak_ptr< _Tp ></b></td></tr>
<tr class="separator:a5e1bc0d904f3a9244016847e7d0316e1"><td class="memSeparator" colspan="2"> </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="a00467_source.html#l00093">93</a> of file <a class="el" href="a00467_source.html">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="a06085.html">std::shared_ptr</a>< _Tp >::<a class="el" href="a06085.html">shared_ptr</a> </td>
<td>(</td>
<td class="paramname"></td><td>)</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="a00467_source.html#l00104">104</a> of file <a class="el" href="a00467_source.html">shared_ptr.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="a00467_source.html#l00104">std::shared_ptr< _State >::shared_ptr()</a>.</p>
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template<typename _Tp1 > </div>
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<td class="memname"><a class="el" href="a06085.html">std::shared_ptr</a>< _Tp >::<a class="el" href="a06085.html">shared_ptr</a> </td>
<td>(</td>
<td class="paramtype">_Tp1 * </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>
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<p class="definition">Definition at line <a class="el" href="a00467_source.html#l00116">116</a> of file <a class="el" href="a00467_source.html">shared_ptr.h</a>.</p>
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<td>(</td>
<td class="paramtype">_Tp1 * </td>
<td class="paramname"><em>__p</em>, </td>
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<td class="paramtype">_Deleter </td>
<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="a00467_source.html#l00133">133</a> of file <a class="el" href="a00467_source.html">shared_ptr.h</a>.</p>
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<td class="paramname"><em>__p</em>, </td>
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<td class="paramtype">_Deleter </td>
<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>
</dl>
<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="a00467_source.html#l00150">150</a> of file <a class="el" href="a00467_source.html">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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<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="a00467_source.html#l00169">169</a> of file <a class="el" href="a00467_source.html">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="paramtype">_Deleter </td>
<td class="paramname"><em>__d</em>, </td>
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<td class="paramname"><em>__a</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>
</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>The last owner will call __d(__p) </p>
<p class="definition">Definition at line <a class="el" href="a00467_source.html#l00188">188</a> of file <a class="el" href="a00467_source.html">shared_ptr.h</a>.</p>
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<td class="paramname"><em>__r</em>, </td>
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<td class="paramname"><em>__p</em> </td>
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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="a00467_source.html#l00210">210</a> of file <a class="el" href="a00467_source.html">shared_ptr.h</a>.</p>
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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>
</dl>
<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="a00467_source.html#l00221">221</a> of file <a class="el" href="a00467_source.html">shared_ptr.h</a>.</p>
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<td class="paramtype"><a class="el" href="a06085.html">shared_ptr</a>< _Tp > && </td>
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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="a00467_source.html#l00229">229</a> of file <a class="el" href="a00467_source.html">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>
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<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="a00467_source.html#l00238">238</a> of file <a class="el" href="a00467_source.html">shared_ptr.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1f2fd0c30fae162c2028b4ef0f7647dd">◆ </a></span>shared_ptr() <span class="overload">[11/12]</span></h2>
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template<typename _Tp> </div>
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template<typename _Tp1 > </div>
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<td class="memname"><a class="el" href="a06085.html">std::shared_ptr</a>< _Tp >::<a class="el" href="a06085.html">shared_ptr</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="a06093.html">weak_ptr</a>< _Tp1 > & </td>
<td class="paramname"><em>__r</em></td><td>)</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>
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<tr><td class="paramname">__r</td><td>A weak_ptr. </td></tr>
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<dl class="section post"><dt>Postcondition</dt><dd>use_count() == __r.use_count() </dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
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<tr><td class="paramname">bad_weak_ptr</td><td>when __r.expired(), in which case the constructor has no effect. </td></tr>
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<p class="definition">Definition at line <a class="el" href="a00467_source.html#l00250">250</a> of file <a class="el" href="a00467_source.html">shared_ptr.h</a>.</p>
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<td class="memname">constexpr <a class="el" href="a06085.html">std::shared_ptr</a>< _Tp >::<a class="el" href="a06085.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() == nullptr </dd></dl>
<p class="definition">Definition at line <a class="el" href="a00467_source.html#l00269">269</a> of file <a class="el" href="a00467_source.html">shared_ptr.h</a>.</p>
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<h2 class="groupheader">Friends And Related Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a77b51f20fa9bcc07477ddf4843e7a8e4">◆ </a></span>allocate_shared</h2>
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template<typename _Tp> </div>
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template<typename _Tp1 , typename _Alloc , typename... _Args> </div>
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<td class="memname"><a class="el" href="a06085.html">shared_ptr</a><_Tp1> allocate_shared </td>
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<td class="paramname"><em>__a</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">_Args &&... </td>
<td class="paramname"><em>__args</em> </td>
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<td>)</td>
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<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>
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</dd>
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<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>
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<tr><td class="paramname">An</td><td>exception thrown from <em>_Alloc::allocate</em> or from the constructor of <em>_Tp</em>.</td></tr>
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<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="a00467_source.html#l00617">617</a> of file <a class="el" href="a00467_source.html">shared_ptr.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="a00467_source.html#l00269">std::shared_ptr< _State >::shared_ptr()</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="a00467_source.html">shared_ptr.h</a></li>
<li><a class="el" href="a00671_source.html">auto_ptr.h</a></li>
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