<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class template intrusive_ptr</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../interprocess/indexes_reference.html#header.boost.interprocess.smart_ptr.intrusive_ptr_hpp" title="Header <boost/interprocess/smart_ptr/intrusive_ptr.hpp>"> <link rel="prev" href="deleter.html" title="Class template deleter"> <link rel="next" href="operator_idm45879390712336.html" title="Function template operator=="> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ 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class="refentry"> <a name="boost.interprocess.intrusive_ptr"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Class template intrusive_ptr</span></h2> <p>boost::interprocess::intrusive_ptr</p> </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <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>> </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> <span class="keyword">class</span> <a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">{</span> <span class="keyword">public</span><span class="special">:</span> <span class="comment">// types</span> <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> <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> <span class="comment">// <a class="link" href="intrusive_ptr.html#boost.interprocess.intrusive_ptrconstruct-copy-destruct">construct/copy/destruct</a></span> <a class="link" href="intrusive_ptr.html#idm45879390728528-bb"><span class="identifier">intrusive_ptr</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> <a class="link" href="intrusive_ptr.html#idm45879390727776-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="special">;</span> <a class="link" href="intrusive_ptr.html#idm45879390725280-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="special">;</span> <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#idm45879390723488-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="special">;</span> <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#idm45879390720032-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="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <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" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45879390717712-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="special">;</span> <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#idm45879390714544-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="special">;</span> <a class="link" href="intrusive_ptr.html#idm45879390720832-bb"><span class="special">~</span><span class="identifier">intrusive_ptr</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> <span class="comment">// <a class="link" href="intrusive_ptr.html#idm45879390741920-bb">public member functions</a></span> <span class="identifier">pointer</span> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45879390741360-bb"><span class="identifier">get</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> <span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45879390740048-bb"><span class="identifier">get</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="identifier">T</span> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45879390738464-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="special">;</span> <span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45879390736912-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="special">;</span> <span class="identifier">pointer</span> <span class="special">&</span> <a class="link" href="intrusive_ptr.html#idm45879390735360-bb"><span class="keyword">operator</span><span class="special">-></span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> <a class="link" href="intrusive_ptr.html#idm45879390734080-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="special">;</span> <span class="keyword">bool</span> <a class="link" href="intrusive_ptr.html#idm45879390732528-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="special">;</span> <span class="keyword">void</span> <a class="link" href="intrusive_ptr.html#idm45879390730976-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="special">;</span> <span class="special">}</span><span class="special">;</span></pre></div> <div class="refsect1"> <a name="idm45555315635600"></a><h2>Description</h2> <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> <p>void intrusive_ptr_add_ref(T * p); void intrusive_ptr_release(T * p);</p> <p>with (p != 0)</p> <p>The object is responsible for destroying itself. </p> <div class="refsect2"> <a name="idm45555315630032"></a><h3> <a name="boost.interprocess.intrusive_ptrconstruct-copy-destruct"></a><code class="computeroutput">intrusive_ptr</code> public construct/copy/destruct</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><a name="idm45879390728528-bb"></a><span class="identifier">intrusive_ptr</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> <p>Constructor. Initializes internal pointer to 0. Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><a name="idm45879390727776-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="special">;</span></pre> <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> </li> <li class="listitem"> <pre class="literallayout"><a name="idm45879390725280-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="special">;</span></pre> <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> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a name="idm45879390723488-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="special">;</span></pre> <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> </li> <li class="listitem"> <pre class="literallayout"><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a name="idm45879390720032-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="keyword">const</span> <span class="special">&</span> rhs<span class="special">)</span><span class="special">;</span></pre> <p>Assignment operator. Equivalent to intrusive_ptr(r).swap(*this). Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><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" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a name="idm45879390717712-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="special">;</span></pre> <p>Assignment from related. Equivalent to intrusive_ptr(r).swap(*this). Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><a class="link" href="intrusive_ptr.html" title="Class template intrusive_ptr">intrusive_ptr</a> <span class="special">&</span> <a name="idm45879390714544-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="special">;</span></pre> <p>Assignment from pointer. Equivalent to intrusive_ptr(r).swap(*this). Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><a name="idm45879390720832-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> <p>Destructor. If internal pointer is not 0, calls intrusive_ptr_release(to_raw_pointer(m_ptr)). Does not throw </p> </li> </ol></div> </div> <div class="refsect2"> <a name="idm45555315564000"></a><h3> <a name="idm45879390741920-bb"></a><code class="computeroutput">intrusive_ptr</code> public member functions</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><span class="identifier">pointer</span> <span class="special">&</span> <a name="idm45879390741360-bb"></a><span class="identifier">get</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> <p>Returns a reference to the internal pointer. Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> <a name="idm45879390740048-bb"></a><span class="identifier">get</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <p>Returns a reference to the internal pointer. Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">T</span> <span class="special">&</span> <a name="idm45879390738464-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="special">;</span></pre> <p>Returns *get(). Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> <a name="idm45879390736912-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="special">;</span></pre> <p>Returns *get(). Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">pointer</span> <span class="special">&</span> <a name="idm45879390735360-bb"></a><span class="keyword">operator</span><span class="special">-></span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> <p>Returns get(). Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><a name="idm45879390734080-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="special">;</span></pre> <p>Conversion to boolean. Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45879390732528-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="special">;</span></pre> <p>Not operator. Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">void</span> <a name="idm45879390730976-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="special">;</span></pre> <p>Exchanges the contents of the two smart pointers. Does not throw </p> </li> </ol></div> </div> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2005-2015 Ion Gaztanaga<p> Distributed under the Boost Software License, Version 1.0. (See accompanying 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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <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_idm45879390712336.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>