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src="../../../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="boost.interprocess.intrusive_ptr"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Class template intrusive_ptr</span></h2> 30<p>boost::interprocess::intrusive_ptr</p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../interprocess/indexes_reference.html#header.boost.interprocess.smart_ptr.intrusive_ptr_hpp" title="Header <boost/interprocess/smart_ptr/intrusive_ptr.hpp>">boost/interprocess/smart_ptr/intrusive_ptr.hpp</a>> 34 35</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> VoidPointer<span class="special">></span> 36<span class="keyword">class</span> <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">{</span> 37<span class="keyword">public</span><span class="special">:</span> 38 <span class="comment">// types</span> 39 <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">::</span><span class="identifier">pointer_traits</span><span class="special"><</span> <span class="identifier">VoidPointer</span> <span class="special">></span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">rebind_pointer</span><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="boost.interprocess.intrusive_ptr.pointer"></a><span class="identifier">pointer</span><span class="special">;</span> <span class="comment">// Provides the type of the internal stored pointer. </span> 40 <span class="keyword">typedef</span> <span class="identifier">T</span> <a name="boost.interprocess.intrusive_ptr.element_type"></a><span class="identifier">element_type</span><span class="special">;</span> <span class="comment">// Provides the type of the stored pointer. </span> 41 42 <span class="comment">// <a class="link" href="intrusive_ptr.html#boost.interprocess.intrusive_ptrconstruct-copy-destruct">construct/copy/destruct</a></span> 43 <a class="link" href="intrusive_ptr.html#idm45304011002496-bb"><span class="identifier">intrusive_ptr</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 44 <a class="link" href="intrusive_ptr.html#idm45304011001472-bb"><span class="identifier">intrusive_ptr</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span><span class="special">,</span> <span class="keyword">bool</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 45 <a class="link" href="intrusive_ptr.html#idm45304010998704-bb"><span class="identifier">intrusive_ptr</span></a><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 46 <a class="link" href="intrusive_ptr.html#idm45304010996640-bb"><span class="identifier">intrusive_ptr</span></a><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 47 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a class="link" href="intrusive_ptr.html#idm45304010994768-bb"><span class="identifier">intrusive_ptr</span></a><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a><span class="special"><</span> <span class="identifier">U</span><span class="special">,</span> <span class="identifier">VP</span> <span class="special">></span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 48 <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45304010991232-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">BOOST_COPY_ASSIGN_REF</span><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a><span class="special">)</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 49 <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45304010988480-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 50 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> 51 <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45304010985920-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a><span class="special"><</span> <span class="identifier">U</span><span class="special">,</span> <span class="identifier">VP</span> <span class="special">></span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 52 <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45304010982480-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">pointer</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 53 <a class="link" href="intrusive_ptr.html#idm45304010991840-bb"><span class="special">~</span><span class="identifier">intrusive_ptr</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 54 55 <span class="comment">// <a class="link" href="intrusive_ptr.html#idm45304011018368-bb">public member functions</a></span> 56 <span class="keyword">void</span> <a class="link" href="intrusive_ptr.html#idm45304011017808-bb"><span class="identifier">reset</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 57 <span class="identifier">pointer</span> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45304011016144-bb"><span class="identifier">get</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 58 <span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45304011014560-bb"><span class="identifier">get</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> 59 <span class="identifier">T</span> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45304011012976-bb"><span class="keyword">operator</span> <span class="special">*</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> 60 <span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45304011011424-bb"><span class="keyword">operator</span><span class="special">-></span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> 61 <span class="identifier">pointer</span> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45304011009872-bb"><span class="keyword">operator</span><span class="special">-></span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 62 <a class="link" href="intrusive_ptr.html#idm45304011008320-bb"><span class="keyword">operator</span> <span class="identifier">unspecified_bool_type</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> 63 <span class="keyword">bool</span> <a class="link" href="intrusive_ptr.html#idm45304011006768-bb"><span class="keyword">operator</span><span class="special">!</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> 64 <span class="keyword">void</span> <a class="link" href="intrusive_ptr.html#idm45304011005216-bb"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> 65<span class="special">}</span><span class="special">;</span></pre></div> 66<div class="refsect1"> 67<a name="id-1.3.19.17.3.50.4.4"></a><h2>Description</h2> 68<p>The <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> class template stores a pointer to an object with an embedded reference count. <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> is parameterized on T (the type of the object pointed to) and VoidPointer(a void pointer type that defines the type of pointer that <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> will store). intrusive_ptr<T, void *> defines a class with a T* member whereas <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a><T, offset_ptr<void> > defines a class with a offset_ptr<T> member. Relies on unqualified calls to:</p> 69<p>void intrusive_ptr_add_ref(T * p) BOOST_NOEXCEPT; void intrusive_ptr_release(T * p) BOOST_NOEXCEPT;</p> 70<p>with (p != 0)</p> 71<p>The object is responsible for destroying itself. </p> 72<div class="refsect2"> 73<a name="id-1.3.19.17.3.50.4.4.6"></a><h3> 74<a name="boost.interprocess.intrusive_ptrconstruct-copy-destruct"></a><code class="computeroutput">intrusive_ptr</code> 75 public 76 construct/copy/destruct</h3> 77<div class="orderedlist"><ol class="orderedlist" type="1"> 78<li class="listitem"> 79<pre class="literallayout"><a name="idm45304011002496-bb"></a><span class="identifier">intrusive_ptr</span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 80<p>Constructor. Initializes internal pointer to 0. Does not throw </p> 81</li> 82<li class="listitem"> 83<pre class="literallayout"><a name="idm45304011001472-bb"></a><span class="identifier">intrusive_ptr</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> p<span class="special">,</span> <span class="keyword">bool</span> add_ref <span class="special">=</span> <span class="keyword">true</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 84<p>Constructor. Copies pointer and if "p" is not zero and "add_ref" is true calls intrusive_ptr_add_ref(to_raw_pointer(p)). Does not throw </p> 85</li> 86<li class="listitem"> 87<pre class="literallayout"><a name="idm45304010998704-bb"></a><span class="identifier">intrusive_ptr</span><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="keyword">const</span> <span class="special">&</span> rhs<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 88<p>Copy constructor. Copies the internal pointer and if "p" is not zero calls intrusive_ptr_add_ref(to_raw_pointer(p)). Does not throw </p> 89</li> 90<li class="listitem"> 91<pre class="literallayout"><a name="idm45304010996640-bb"></a><span class="identifier">intrusive_ptr</span><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&&</span> rhs<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>Move constructor. Moves the internal pointer. Does not throw. </li> 92<li class="listitem"> 93<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> 94 <a name="idm45304010994768-bb"></a><span class="identifier">intrusive_ptr</span><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a><span class="special"><</span> <span class="identifier">U</span><span class="special">,</span> <span class="identifier">VP</span> <span class="special">></span> <span class="keyword">const</span> <span class="special">&</span> rhs<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 95<p>Constructor from related. Copies the internal pointer and if "p" is not zero calls intrusive_ptr_add_ref(to_raw_pointer(p)). Does not throw </p> 96</li> 97<li class="listitem"> 98<pre class="literallayout"><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a name="idm45304010991232-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">BOOST_COPY_ASSIGN_REF</span><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a><span class="special">)</span> rhs<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 99<p>Assignment operator. Equivalent to intrusive_ptr(r).swap(*this). Does not throw </p> 100</li> 101<li class="listitem"> 102<pre class="literallayout"><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a name="idm45304010988480-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&&</span> rhs<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 103<p>Move Assignment operator Does not throw </p> 104</li> 105<li class="listitem"> 106<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> 107 <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a name="idm45304010985920-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a><span class="special"><</span> <span class="identifier">U</span><span class="special">,</span> <span class="identifier">VP</span> <span class="special">></span> <span class="keyword">const</span> <span class="special">&</span> rhs<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 108<p>Assignment from related. Equivalent to intrusive_ptr(r).swap(*this). Does not throw </p> 109</li> 110<li class="listitem"> 111<pre class="literallayout"><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a name="idm45304010982480-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">pointer</span> rhs<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 112<p>Assignment from pointer. Equivalent to intrusive_ptr(r).swap(*this). Does not throw </p> 113</li> 114<li class="listitem"> 115<pre class="literallayout"><a name="idm45304010991840-bb"></a><span class="special">~</span><span class="identifier">intrusive_ptr</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Destructor. Calls reset(). Does not throw. </li> 116</ol></div> 117</div> 118<div class="refsect2"> 119<a name="id-1.3.19.17.3.50.4.4.7"></a><h3> 120<a name="idm45304011018368-bb"></a><code class="computeroutput">intrusive_ptr</code> public member functions</h3> 121<div class="orderedlist"><ol class="orderedlist" type="1"> 122<li class="listitem"> 123<pre class="literallayout"><span class="keyword">void</span> <a name="idm45304011017808-bb"></a><span class="identifier">reset</span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 124<p>Release internal pointer and set it to 0. If internal pointer is not 0, calls intrusive_ptr_release(to_raw_pointer(m_ptr)). Does not throw </p> 125</li> 126<li class="listitem"> 127<pre class="literallayout"><span class="identifier">pointer</span> <span class="special">&</span> <a name="idm45304011016144-bb"></a><span class="identifier">get</span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 128<p>Returns a reference to the internal pointer. Does not throw </p> 129</li> 130<li class="listitem"> 131<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> <a name="idm45304011014560-bb"></a><span class="identifier">get</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 132<p>Returns a reference to the internal pointer. Does not throw </p> 133</li> 134<li class="listitem"> 135<pre class="literallayout"><span class="identifier">T</span> <span class="special">&</span> <a name="idm45304011012976-bb"></a><span class="keyword">operator</span> <span class="special">*</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 136<p>Returns *get(). Does not throw </p> 137</li> 138<li class="listitem"> 139<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> <a name="idm45304011011424-bb"></a><span class="keyword">operator</span><span class="special">-></span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 140<p>Returns *get(). Does not throw </p> 141</li> 142<li class="listitem"> 143<pre class="literallayout"><span class="identifier">pointer</span> <span class="special">&</span> <a name="idm45304011009872-bb"></a><span class="keyword">operator</span><span class="special">-></span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 144<p>Returns get(). Does not throw </p> 145</li> 146<li class="listitem"> 147<pre class="literallayout"><a name="idm45304011008320-bb"></a><span class="keyword">operator</span> <span class="identifier">unspecified_bool_type</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 148<p>Conversion to boolean. Does not throw </p> 149</li> 150<li class="listitem"> 151<pre class="literallayout"><span class="keyword">bool</span> <a name="idm45304011006768-bb"></a><span class="keyword">operator</span><span class="special">!</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 152<p>Not operator. Does not throw </p> 153</li> 154<li class="listitem"> 155<pre class="literallayout"><span class="keyword">void</span> <a name="idm45304011005216-bb"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> rhs<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> 156<p>Exchanges the contents of the two smart pointers. Does not throw </p> 157</li> 158</ol></div> 159</div> 160</div> 161</div> 162<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 163<td align="left"></td> 164<td align="right"><div class="copyright-footer">Copyright © 2005-2015 Ion Gaztanaga<p> 165 Distributed under the Boost Software License, Version 1.0. (See accompanying 166 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 167 </p> 168</div></td> 169</tr></table> 170<hr> 171<div class="spirit-nav"> 172<a accesskey="p" href="deleter.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../interprocess/indexes_reference.html#header.boost.interprocess.smart_ptr.intrusive_ptr_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="operator_idm45304010980000.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 173</div> 174</body> 175</html> 176
