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  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: &lt;<a class="link" href="../../interprocess/indexes_reference.html#header.boost.interprocess.smart_ptr.intrusive_ptr_hpp" title="Header &lt;boost/interprocess/smart_ptr/intrusive_ptr.hpp&gt;">boost/interprocess/smart_ptr/intrusive_ptr.hpp</a>&gt;
  34
  35 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> VoidPointer<span class="special">&gt;</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">&lt;</span> <span class="identifier">VoidPointer</span> <span class="special">&gt;</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">rebind_pointer</span><span class="special">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</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#idm45336641223696-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#idm45336641222672-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">&amp;</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#idm45336641219904-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">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  46   <a class="link" href="intrusive_ptr.html#idm45336641217840-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">&amp;&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  47   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<span class="special">&gt;</span> <a class="link" href="intrusive_ptr.html#idm45336641215968-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">&lt;</span> <span class="identifier">U</span><span class="special">,</span> <span class="identifier">VP</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</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">&amp;</span> <a class="link" href="intrusive_ptr.html#idm45336641212432-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">&amp;</span> <a class="link" href="intrusive_ptr.html#idm45336641209680-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">&amp;&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  50   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<span class="special">&gt;</span>
  51     <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&amp;</span> <a class="link" href="intrusive_ptr.html#idm45336641207120-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">&lt;</span> <span class="identifier">U</span><span class="special">,</span> <span class="identifier">VP</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</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">&amp;</span> <a class="link" href="intrusive_ptr.html#idm45336641203680-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#idm45336641213040-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#idm45336641239568-bb">public member functions</a></span>
  56   <span class="keyword">void</span> <a class="link" href="intrusive_ptr.html#idm45336641239008-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">&amp;</span> <a class="link" href="intrusive_ptr.html#idm45336641237344-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">&amp;</span> <a class="link" href="intrusive_ptr.html#idm45336641235760-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">&amp;</span> <a class="link" href="intrusive_ptr.html#idm45336641234176-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">&amp;</span> <a class="link" href="intrusive_ptr.html#idm45336641232624-bb"><span class="keyword">operator</span><span class="special">-&gt;</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">&amp;</span> <a class="link" href="intrusive_ptr.html#idm45336641231072-bb"><span class="keyword">operator</span><span class="special">-&gt;</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#idm45336641229520-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#idm45336641227968-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#idm45336641226416-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">&amp;</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&lt;T, void *&gt; defines a class with a T* member whereas <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a>&lt;T, offset_ptr&lt;void&gt; &gt; defines a class with a offset_ptr&lt;T&gt; 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="idm45336641223696-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="idm45336641222672-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">&amp;</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="idm45336641219904-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">&amp;</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="idm45336641217840-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">&amp;&amp;</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">&lt;</span><span class="keyword">typename</span> U<span class="special">&gt;</span>
  94   <a name="idm45336641215968-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">&lt;</span> <span class="identifier">U</span><span class="special">,</span> <span class="identifier">VP</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</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">&amp;</span> <a name="idm45336641212432-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">&amp;</span> <a name="idm45336641209680-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">&amp;&amp;</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">&lt;</span><span class="keyword">typename</span> U<span class="special">&gt;</span>
 107   <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&amp;</span> <a name="idm45336641207120-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">&lt;</span> <span class="identifier">U</span><span class="special">,</span> <span class="identifier">VP</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</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">&amp;</span> <a name="idm45336641203680-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="idm45336641213040-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="idm45336641239568-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="idm45336641239008-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">&amp;</span> <a name="idm45336641237344-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">&amp;</span> <a name="idm45336641235760-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">&amp;</span> <a name="idm45336641234176-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">&amp;</span> <a name="idm45336641232624-bb"></a><span class="keyword">operator</span><span class="special">-&gt;</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">&amp;</span> <a name="idm45336641231072-bb"></a><span class="keyword">operator</span><span class="special">-&gt;</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="idm45336641229520-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="idm45336641227968-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="idm45336641226416-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">&amp;</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>
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 164 <td align="right"><div class="copyright-footer">Copyright &#169; 2005-2015 Ion Gaztanaga<p>
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