<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class mapped_region</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../boost_interprocess_reference.html#header.boost.interprocess.mapped_region_hpp" title="Header <boost/interprocess/mapped_region.hpp>"> <link rel="prev" href="basic_managed_windows_s_id820482.html" title="Class template basic_managed_windows_shared_memory"> <link rel="next" href="rbtree_best_fit.html" title="Class template rbtree_best_fit"> </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++ Libraries" width="277" height="86" src="../../../../boost.png"></td> <td align="center"><a 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class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Class mapped_region</span></h2> <p>boost::interprocess::mapped_region</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="../../boost_interprocess_reference.html#header.boost.interprocess.mapped_region_hpp" title="Header <boost/interprocess/mapped_region.hpp>">boost/interprocess/mapped_region.hpp</a>> </span> <span class="keyword">class</span> <a class="link" href="mapped_region.html" title="Class mapped_region">mapped_region</a> <span class="special">{</span> <span class="keyword">public</span><span class="special">:</span> <span class="comment">// <a class="link" href="mapped_region.html#boost.interprocess.mapped_regionconstruct-copy-destruct">construct/copy/destruct</a></span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> MemoryMappable<span class="special">></span> <a class="link" href="mapped_region.html#id820855-bb"><span class="identifier">mapped_region</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">MemoryMappable</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">mode_t</span><span class="special">,</span> <span class="identifier">offset_t</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">void</span> <span class="special">*</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span> <a class="link" href="mapped_region.html#id820905-bb"><span class="identifier">mapped_region</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> <a class="link" href="mapped_region.html#id820911-bb"><span class="identifier">mapped_region</span></a><span class="special">(</span><a class="link" href="mapped_region.html" title="Class mapped_region">mapped_region</a> <span class="special">&&</span><span class="special">)</span><span class="special">;</span> mapped_region& <a class="link" href="mapped_region.html#id820931-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="mapped_region.html" title="Class mapped_region">mapped_region</a> <span class="special">&&</span><span class="special">)</span><span class="special">;</span> <a class="link" href="mapped_region.html#id820926-bb"><span class="special">~</span><span class="identifier">mapped_region</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> <span class="comment">// <a class="link" href="mapped_region.html#id820753-bb">public member functions</a></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="mapped_region.html#id820756-bb"><span class="identifier">get_size</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="keyword">void</span> <span class="special">*</span> <a class="link" href="mapped_region.html#id820770-bb"><span class="identifier">get_address</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="identifier">offset_t</span> <a class="link" href="mapped_region.html#id820782-bb"><span class="identifier">get_offset</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="identifier">mode_t</span> <a class="link" href="mapped_region.html#id820794-bb"><span class="identifier">get_mode</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="mapped_region.html#id820807-bb"><span class="identifier">flush</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span> <span class="keyword">void</span> <a class="link" href="mapped_region.html#id820835-bb"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="mapped_region.html" title="Class mapped_region">mapped_region</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="comment">// <a class="link" href="mapped_region.html#id820945-bb">public static functions</a></span> <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="mapped_region.html#id820949-bb"><span class="identifier">get_page_size</span></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="id1475946"></a><h2>Description</h2> <p>The mapped_region class represents a portion or region created from a memory_mappable object. </p> <div class="refsect2"> <a name="id1475953"></a><h3> <a name="boost.interprocess.mapped_regionconstruct-copy-destruct"></a><code class="computeroutput">mapped_region</code> public construct/copy/destruct</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> MemoryMappable<span class="special">></span> <a name="id820855-bb"></a><span class="identifier">mapped_region</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">MemoryMappable</span> <span class="special">&</span> mapping<span class="special">,</span> <span class="identifier">mode_t</span> mode<span class="special">,</span> <span class="identifier">offset_t</span> offset <span class="special">=</span> <span class="number">0</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> size <span class="special">=</span> <span class="number">0</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">void</span> <span class="special">*</span> address <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre> <p>Creates a mapping region of the mapped memory "mapping", starting in offset "offset", and the mapping's size will be "size". The mapping can be opened for read-only "read_only" or read-write "read_write. </p> </li> <li class="listitem"> <pre class="literallayout"><a name="id820905-bb"></a><span class="identifier">mapped_region</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> <p>Default constructor. Address and size and offset will be 0. Does not throw </p> </li> <li class="listitem"> <pre class="literallayout"><a name="id820911-bb"></a><span class="identifier">mapped_region</span><span class="special">(</span><a class="link" href="mapped_region.html" title="Class mapped_region">mapped_region</a> <span class="special">&&</span> other<span class="special">)</span><span class="special">;</span></pre> <p>Move constructor. *this will be constructed taking ownership of "other"'s region and "other" will be left in default constructor state. </p> </li> <li class="listitem"> <pre class="literallayout">mapped_region& <a name="id820931-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="mapped_region.html" title="Class mapped_region">mapped_region</a> <span class="special">&&</span> other<span class="special">)</span><span class="special">;</span></pre> <p>Move assignment. If *this owns a memory mapped region, it will be destroyed and it will take ownership of "other"'s memory mapped region. </p> </li> <li class="listitem"> <pre class="literallayout"><a name="id820926-bb"></a><span class="special">~</span><span class="identifier">mapped_region</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> <p>Destroys the mapped region. Does not throw </p> </li> </ol></div> </div> <div class="refsect2"> <a name="id1476309"></a><h3> <a name="id820753-bb"></a><code class="computeroutput">mapped_region</code> public member functions</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="id820756-bb"></a><span class="identifier">get_size</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <p>Returns the size of the mapping. Note for windows users: If windows_shared_memory is mapped using 0 as the size, it returns 0 because the size is unknown. Never throws. </p> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">void</span> <span class="special">*</span> <a name="id820770-bb"></a><span class="identifier">get_address</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <p>Returns the base address of the mapping. Never throws. </p> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">offset_t</span> <a name="id820782-bb"></a><span class="identifier">get_offset</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <p>Returns the offset of the mapping from the beginning of the mapped memory. Never throws. </p> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">mode_t</span> <a name="id820794-bb"></a><span class="identifier">get_mode</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <p>Returns the mode of the mapping used to construct the mapped file. Never throws. </p> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">bool</span> <a name="id820807-bb"></a><span class="identifier">flush</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> mapping_offset <span class="special">=</span> <span class="number">0</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> numbytes <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre> <p>Flushes to the disk a byte range within the mapped memory. Never throws </p> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">void</span> <a name="id820835-bb"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="mapped_region.html" title="Class mapped_region">mapped_region</a> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre> <p>Swaps the mapped_region with another mapped region </p> </li> </ol></div> </div> <div class="refsect2"> <a name="id1476662"></a><h3> <a name="id820945-bb"></a><code class="computeroutput">mapped_region</code> public static functions</h3> <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="id820949-bb"></a><span class="identifier">get_page_size</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> <p>Returns the size of the page. This size is the minimum memory that will be used by the system when mapping a memory mappable source. </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 - 2008 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="basic_managed_windows_s_id820482.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_interprocess_reference.html#header.boost.interprocess.mapped_region_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="rbtree_best_fit.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>