1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Class template mapped_view</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../index.html" title="Chapter 1. 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22<div class="spirit-nav"> 23<a accesskey="p" href="flat_set.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_compute/reference.html#header.boost.compute.container.mapped_view_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="stack.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="refentry"> 26<a name="boost.compute.mapped_view"></a><div class="titlepage"></div> 27<div class="refnamediv"> 28<h2><span class="refentrytitle">Class template mapped_view</span></h2> 29<p>boost::compute::mapped_view — A mapped view of host memory. </p> 30</div> 31<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 32<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_compute/reference.html#header.boost.compute.container.mapped_view_hpp" title="Header <boost/compute/container/mapped_view.hpp>">boost/compute/container/mapped_view.hpp</a>> 33 34</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> 35<span class="keyword">class</span> <a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a> <span class="special">{</span> 36<span class="keyword">public</span><span class="special">:</span> 37 <span class="comment">// types</span> 38 <span class="keyword">typedef</span> <span class="identifier">T</span> <a name="boost.compute.mapped_view.value_type"></a><span class="identifier">value_type</span><span class="special">;</span> 39 <span class="keyword">typedef</span> <span class="identifier">size_t</span> <a name="boost.compute.mapped_view.size_type"></a><span class="identifier">size_type</span><span class="special">;</span> 40 <span class="keyword">typedef</span> <span class="identifier">ptrdiff_t</span> <a name="boost.compute.mapped_view.difference_type"></a><span class="identifier">difference_type</span><span class="special">;</span> 41 <span class="keyword">typedef</span> <a class="link" href="buffer_iterator.html" title="Class template buffer_iterator">buffer_iterator</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <a name="boost.compute.mapped_view.iterator"></a><span class="identifier">iterator</span><span class="special">;</span> 42 <span class="keyword">typedef</span> <a class="link" href="buffer_iterator.html" title="Class template buffer_iterator">buffer_iterator</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <a name="boost.compute.mapped_view.const_iterator"></a><span class="identifier">const_iterator</span><span class="special">;</span> 43 44 <span class="comment">// <a class="link" href="mapped_view.html#boost.compute.mapped_viewconstruct-copy-destruct">construct/copy/destruct</a></span> 45 <a class="link" href="mapped_view.html#idm45549385871248-bb"><span class="identifier">mapped_view</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 46 <a class="link" href="mapped_view.html#idm45549385869936-bb"><span class="identifier">mapped_view</span></a><span class="special">(</span><span class="identifier">T</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">context</span> <span class="special">&</span> <span class="special">=</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">default_context</span><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span> 47 <a class="link" href="mapped_view.html#idm45549385863936-bb"><span class="identifier">mapped_view</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">,</span> 48 <span class="keyword">const</span> <span class="identifier">context</span> <span class="special">&</span> <span class="special">=</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">default_context</span><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span> 49 <a class="link" href="mapped_view.html#idm45549385857936-bb"><span class="identifier">mapped_view</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 50 <a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">&</span> <a class="link" href="mapped_view.html#idm45549385855776-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 51 <a class="link" href="mapped_view.html#idm45549385853024-bb"><span class="special">~</span><span class="identifier">mapped_view</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 52 53 <span class="comment">// <a class="link" href="mapped_view.html#idm45549385906944-bb">public member functions</a></span> 54 <a class="link" href="mapped_view.html#boost.compute.mapped_view.iterator">iterator</a> <a class="link" href="mapped_view.html#idm45549385906384-bb"><span class="identifier">begin</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 55 <a class="link" href="mapped_view.html#boost.compute.mapped_view.const_iterator">const_iterator</a> <a class="link" href="mapped_view.html#idm45549385904352-bb"><span class="identifier">begin</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 56 <a class="link" href="mapped_view.html#boost.compute.mapped_view.const_iterator">const_iterator</a> <a class="link" href="mapped_view.html#idm45549385902048-bb"><span class="identifier">cbegin</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 57 <a class="link" href="mapped_view.html#boost.compute.mapped_view.iterator">iterator</a> <a class="link" href="mapped_view.html#idm45549385899744-bb"><span class="identifier">end</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 58 <a class="link" href="mapped_view.html#boost.compute.mapped_view.const_iterator">const_iterator</a> <a class="link" href="mapped_view.html#idm45549385897696-bb"><span class="identifier">end</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 59 <a class="link" href="mapped_view.html#boost.compute.mapped_view.const_iterator">const_iterator</a> <a class="link" href="mapped_view.html#idm45549385895376-bb"><span class="identifier">cend</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 60 <span class="identifier">size_type</span> <a class="link" href="mapped_view.html#idm45549385893056-bb"><span class="identifier">size</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 61 <span class="identifier">T</span> <span class="special">*</span> <a class="link" href="mapped_view.html#idm45549385890896-bb"><span class="identifier">get_host_ptr</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 62 <span class="keyword">const</span> <span class="identifier">T</span> <span class="special">*</span> <a class="link" href="mapped_view.html#idm45549385889744-bb"><span class="identifier">get_host_ptr</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 63 <span class="keyword">void</span> <a class="link" href="mapped_view.html#idm45549385888320-bb"><span class="identifier">resize</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span> 64 <span class="keyword">bool</span> <a class="link" href="mapped_view.html#idm45549385885312-bb"><span class="identifier">empty</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 65 <span class="keyword">const</span> <span class="identifier">buffer</span> <span class="special">&</span> <a class="link" href="mapped_view.html#idm45549385882720-bb"><span class="identifier">get_buffer</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 66 <span class="keyword">void</span> <a class="link" href="mapped_view.html#idm45549385881296-bb"><span class="identifier">map</span></a><span class="special">(</span><span class="identifier">cl_map_flags</span><span class="special">,</span> <span class="identifier">command_queue</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 67 <span class="keyword">void</span> <a class="link" href="mapped_view.html#idm45549385877536-bb"><span class="identifier">map</span></a><span class="special">(</span><span class="identifier">command_queue</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 68 <span class="keyword">void</span> <a class="link" href="mapped_view.html#idm45549385874496-bb"><span class="identifier">unmap</span></a><span class="special">(</span><span class="identifier">command_queue</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 69<span class="special">}</span><span class="special">;</span></pre></div> 70<div class="refsect1"> 71<a name="idm45849514187776"></a><h2>Description</h2> 72<p>The <a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a> class simplifies mapping host-memory to a compute device. This allows for host-allocated memory to be used with the Boost.Compute algorithms.</p> 73<p>The following example shows how to map a simple C-array containing data on the host to the device and run the reduce() algorithm to calculate the sum:</p> 74<pre class="programlisting"></pre> 75<p> </p> 76<p><span class="bold"><strong>See Also:</strong></span></p> 77<p>buffer </p> 78<p> 79</p> 80<p> 81</p> 82<div class="refsect2"> 83<a name="idm45849514183728"></a><h3> 84<a name="boost.compute.mapped_viewconstruct-copy-destruct"></a><code class="computeroutput">mapped_view</code> 85 public 86 construct/copy/destruct</h3> 87<div class="orderedlist"><ol class="orderedlist" type="1"> 88<li class="listitem"> 89<pre class="literallayout"><a name="idm45549385871248-bb"></a><span class="identifier">mapped_view</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Creates a null <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code> object. </li> 90<li class="listitem"> 91<pre class="literallayout"><a name="idm45549385869936-bb"></a><span class="identifier">mapped_view</span><span class="special">(</span><span class="identifier">T</span> <span class="special">*</span> host_ptr<span class="special">,</span> <span class="identifier">size_type</span> n<span class="special">,</span> 92 <span class="keyword">const</span> <span class="identifier">context</span> <span class="special">&</span> context <span class="special">=</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">default_context</span><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre> 93<p>Creates a <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code> for <code class="computeroutput">host_ptr</code> with <code class="computeroutput">n</code> elements. After constructing a <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code> the data is available for use by a compute device. Use the <code class="computeroutput">unmap()</code> method to make the updated data available to the host. </p> 94</li> 95<li class="listitem"> 96<pre class="literallayout"><a name="idm45549385863936-bb"></a><span class="identifier">mapped_view</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">*</span> host_ptr<span class="special">,</span> <span class="identifier">size_type</span> n<span class="special">,</span> 97 <span class="keyword">const</span> <span class="identifier">context</span> <span class="special">&</span> context <span class="special">=</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">default_context</span><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre> 98<p>Creates a read-only <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code> for <code class="computeroutput">host_ptr</code> with <code class="computeroutput">n</code> elements. After constructing a <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code> the data is available for use by a compute device. Use the <code class="computeroutput">unmap()</code> method to make the updated data available to the host. </p> 99</li> 100<li class="listitem"> 101<pre class="literallayout"><a name="idm45549385857936-bb"></a><span class="identifier">mapped_view</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>Creates a copy of <code class="computeroutput">other</code>. </li> 102<li class="listitem"> 103<pre class="literallayout"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">&</span> <a name="idm45549385855776-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>Copies the mapped buffer from <code class="computeroutput">other</code>. </li> 104<li class="listitem"> 105<pre class="literallayout"><a name="idm45549385853024-bb"></a><span class="special">~</span><span class="identifier">mapped_view</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Destroys the <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code> object. </li> 106</ol></div> 107</div> 108<div class="refsect2"> 109<a name="idm45849514113904"></a><h3> 110<a name="idm45549385906944-bb"></a><code class="computeroutput">mapped_view</code> public member functions</h3> 111<div class="orderedlist"><ol class="orderedlist" type="1"> 112<li class="listitem"> 113<pre class="literallayout"><a class="link" href="mapped_view.html#boost.compute.mapped_view.iterator">iterator</a> <a name="idm45549385906384-bb"></a><span class="identifier">begin</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Returns an iterator to the first element in the <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code>. </li> 114<li class="listitem"> 115<pre class="literallayout"><a class="link" href="mapped_view.html#boost.compute.mapped_view.const_iterator">const_iterator</a> <a name="idm45549385904352-bb"></a><span class="identifier">begin</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns a const_iterator to the first element in the <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code>. </li> 116<li class="listitem"> 117<pre class="literallayout"><a class="link" href="mapped_view.html#boost.compute.mapped_view.const_iterator">const_iterator</a> <a name="idm45549385902048-bb"></a><span class="identifier">cbegin</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns a const_iterator to the first element in the <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code>. </li> 118<li class="listitem"> 119<pre class="literallayout"><a class="link" href="mapped_view.html#boost.compute.mapped_view.iterator">iterator</a> <a name="idm45549385899744-bb"></a><span class="identifier">end</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Returns an iterator to one past the last element in the <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code>. </li> 120<li class="listitem"> 121<pre class="literallayout"><a class="link" href="mapped_view.html#boost.compute.mapped_view.const_iterator">const_iterator</a> <a name="idm45549385897696-bb"></a><span class="identifier">end</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns a const_iterator to one past the last element in the <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code>. </li> 122<li class="listitem"> 123<pre class="literallayout"><a class="link" href="mapped_view.html#boost.compute.mapped_view.const_iterator">const_iterator</a> <a name="idm45549385895376-bb"></a><span class="identifier">cend</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns a const_iterator to one past the last element in the <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code>. </li> 124<li class="listitem"> 125<pre class="literallayout"><span class="identifier">size_type</span> <a name="idm45549385893056-bb"></a><span class="identifier">size</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns the number of elements in the <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code>. </li> 126<li class="listitem"> 127<pre class="literallayout"><span class="identifier">T</span> <span class="special">*</span> <a name="idm45549385890896-bb"></a><span class="identifier">get_host_ptr</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Returns the host data pointer. </li> 128<li class="listitem"> 129<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">*</span> <a name="idm45549385889744-bb"></a><span class="identifier">get_host_ptr</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns the host data pointer. </li> 130<li class="listitem"> 131<pre class="literallayout"><span class="keyword">void</span> <a name="idm45549385888320-bb"></a><span class="identifier">resize</span><span class="special">(</span><span class="identifier">size_type</span> size<span class="special">)</span><span class="special">;</span></pre>Resizes the <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code> to <code class="computeroutput">size</code> elements. </li> 132<li class="listitem"> 133<pre class="literallayout"><span class="keyword">bool</span> <a name="idm45549385885312-bb"></a><span class="identifier">empty</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns <code class="computeroutput">true</code> if the <code class="computeroutput"><a class="link" href="mapped_view.html" title="Class template mapped_view">mapped_view</a></code> is empty. </li> 134<li class="listitem"> 135<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">buffer</span> <span class="special">&</span> <a name="idm45549385882720-bb"></a><span class="identifier">get_buffer</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns the mapped buffer. </li> 136<li class="listitem"> 137<pre class="literallayout"><span class="keyword">void</span> <a name="idm45549385881296-bb"></a><span class="identifier">map</span><span class="special">(</span><span class="identifier">cl_map_flags</span> flags<span class="special">,</span> <span class="identifier">command_queue</span> <span class="special">&</span> queue<span class="special">)</span><span class="special">;</span></pre> 138<p>Maps the buffer into the host address space.</p> 139<p>See the documentation for <a href="http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueMapBuffer.html" target="_top">clEnqueueMapBuffer()</a> for more information. </p> 140</li> 141<li class="listitem"> 142<pre class="literallayout"><span class="keyword">void</span> <a name="idm45549385877536-bb"></a><span class="identifier">map</span><span class="special">(</span><span class="identifier">command_queue</span> <span class="special">&</span> queue<span class="special">)</span><span class="special">;</span></pre> 143<p>Maps the buffer into the host address space for reading and writing.</p> 144<p>Equivalent to: </p> 145<pre class="programlisting"><span class="identifier">map</span><span class="special">(</span><span class="identifier">CL_MAP_READ</span> <span class="special">|</span> <span class="identifier">CL_MAP_WRITE</span><span class="special">,</span> <span class="identifier">queue</span><span class="special">)</span><span class="special">;</span> 146</pre> 147<p> </p> 148</li> 149<li class="listitem"> 150<pre class="literallayout"><span class="keyword">void</span> <a name="idm45549385874496-bb"></a><span class="identifier">unmap</span><span class="special">(</span><span class="identifier">command_queue</span> <span class="special">&</span> queue<span class="special">)</span><span class="special">;</span></pre> 151<p>Unmaps the buffer from the host address space.</p> 152<p>See the documentation for <a href="http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueUnmapMemObject.html" target="_top">clEnqueueUnmapMemObject()</a> for more information. </p> 153</li> 154</ol></div> 155</div> 156</div> 157</div> 158<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 159<td align="left"></td> 160<td align="right"><div class="copyright-footer">Copyright © 2013, 2014 Kyle Lutz<p> 161 Distributed under the Boost Software License, Version 1.0. (See accompanying 162 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>) 163 </p> 164</div></td> 165</tr></table> 166<hr> 167<div class="spirit-nav"> 168<a accesskey="p" href="flat_set.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_compute/reference.html#header.boost.compute.container.mapped_view_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="stack.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 169</div> 170</body> 171</html> 172
