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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 &#8212; 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: &lt;<a class="link" href="../../boost_compute/reference.html#header.boost.compute.container.mapped_view_hpp" title="Header &lt;boost/compute/container/mapped_view.hpp&gt;">boost/compute/container/mapped_view.hpp</a>&gt;
33
34 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</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">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</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">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</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#idm46009693346944-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#idm46009693345632-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">&amp;</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#idm46009693339632-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">&amp;</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#idm46009693333632-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">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span> <span class="special">&amp;</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">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span> <span class="special">&amp;</span> <a class="link" href="mapped_view.html#idm46009693331472-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">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
51   <a class="link" href="mapped_view.html#idm46009693328720-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#idm46009693382640-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#idm46009693382080-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#idm46009693380048-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#idm46009693377744-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#idm46009693375440-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#idm46009693373392-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#idm46009693371072-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#idm46009693368752-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#idm46009693366592-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#idm46009693365440-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#idm46009693364016-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#idm46009693361008-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">&amp;</span> <a class="link" href="mapped_view.html#idm46009693358416-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#idm46009693356992-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">&amp;</span><span class="special">)</span><span class="special">;</span>
67   <span class="keyword">void</span> <a class="link" href="mapped_view.html#idm46009693353232-bb"><span class="identifier">map</span></a><span class="special">(</span><span class="identifier">command_queue</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
68   <span class="keyword">void</span> <a class="link" href="mapped_view.html#idm46009693350192-bb"><span class="identifier">unmap</span></a><span class="special">(</span><span class="identifier">command_queue</span> <span class="special">&amp;</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="idm46113326062528"></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="idm46113326058480"></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="idm46009693346944-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="idm46009693345632-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">&amp;</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="idm46009693339632-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">&amp;</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="idm46009693333632-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">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span> <span class="special">&amp;</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">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span> <span class="special">&amp;</span> <a name="idm46009693331472-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">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span> <span class="special">&amp;</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="idm46009693328720-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="idm46113325988640"></a><h3>
110 <a name="idm46009693382640-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="idm46009693382080-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="idm46009693380048-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="idm46009693377744-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="idm46009693375440-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="idm46009693373392-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="idm46009693371072-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="idm46009693368752-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="idm46009693366592-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="idm46009693365440-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="idm46009693364016-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="idm46009693361008-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">&amp;</span> <a name="idm46009693358416-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="idm46009693356992-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">&amp;</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="idm46009693353232-bb"></a><span class="identifier">map</span><span class="special">(</span><span class="identifier">command_queue</span> <span class="special">&amp;</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="idm46009693350192-bb"></a><span class="identifier">unmap</span><span class="special">(</span><span class="identifier">command_queue</span> <span class="special">&amp;</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 &#169; 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>
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