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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="boost_compute.tutorial"></a><a class="link" href="tutorial.html" title="Tutorial">Tutorial</a>
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</h2></div></div></div>
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<div class="toc"><dl class="toc">
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<dt><span class="section"><a href="tutorial.html#boost_compute.tutorial.hello_world">Hello World</a></span></dt>
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<dt><span class="section"><a href="tutorial.html#boost_compute.tutorial.transferring_data">Transferring
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Data</a></span></dt>
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<dt><span class="section"><a href="tutorial.html#boost_compute.tutorial.transforming_data">Transforming
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Data</a></span></dt>
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</dl></div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_compute.tutorial.hello_world"></a><a class="link" href="tutorial.html#boost_compute.tutorial.hello_world" title="Hello World">Hello World</a>
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</h3></div></div></div>
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<p>
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The hello world example gives a simple application that prints the name of
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the default compute device on the system.
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</p>
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<p>
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The <code class="computeroutput">boost::compute::system</code>
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class provides access to the OpenCL platforms and devices present on the
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host system.
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</p>
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<p>
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Compute devices are represented with the <code class="computeroutput">device</code>
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class.
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</p>
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<p>
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</p>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">compute</span><span class="special">/</span><span class="identifier">core</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="keyword">namespace</span> <span class="identifier">compute</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">compute</span><span class="special">;</span>
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<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
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<span class="special">{</span>
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<span class="comment">// get the default device</span>
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<span class="identifier">compute</span><span class="special">::</span><span class="identifier">device</span> <span class="identifier">device</span> <span class="special">=</span> <span class="identifier">compute</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">default_device</span><span class="special">();</span>
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<span class="comment">// print the device's name and platform</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"hello from "</span> <span class="special"><<</span> <span class="identifier">device</span><span class="special">.</span><span class="identifier">name</span><span class="special">();</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">" (platform: "</span> <span class="special"><<</span> <span class="identifier">device</span><span class="special">.</span><span class="identifier">platform</span><span class="special">().</span><span class="identifier">name</span><span class="special">()</span> <span class="special"><<</span> <span class="string">")"</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
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<span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
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<span class="special">}</span>
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</pre>
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<p>
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</p>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_compute.tutorial.transferring_data"></a><a class="link" href="tutorial.html#boost_compute.tutorial.transferring_data" title="Transferring Data">Transferring
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Data</a>
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</h3></div></div></div>
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<p>
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Before any computation occurs, data must be transferred from the host to
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the compute device. The generic <code class="computeroutput"><a class="link" href="../boost/compute/copy.html" title="Function template copy">copy()</a></code>
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function provides a simple interface for transfering data and the generic
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<code class="computeroutput"><a class="link" href="../boost/compute/vector.html" title="Class template vector">vector<T></a></code> class
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provides a container for storing data on a compute device.
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</p>
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<p>
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The following example shows how to transfer data from an array on the host
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to a <code class="computeroutput"><a class="link" href="../boost/compute/vector.html" title="Class template vector">vector<T></a></code>
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on the device and then back to a separate <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code>
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on the host. At the end of the example both <code class="computeroutput"><span class="identifier">host_array</span></code>
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and <code class="computeroutput"><span class="identifier">host_vector</span></code> contain the
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same values which were copied through the memory on the compute device.
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</p>
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<p>
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</p>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">compute</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">copy</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">compute</span><span class="special">/</span><span class="identifier">container</span><span class="special">/</span><span class="identifier">vector</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="keyword">namespace</span> <span class="identifier">compute</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">compute</span><span class="special">;</span>
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<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
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<span class="special">{</span>
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<span class="comment">// get default device and setup context</span>
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<span class="identifier">compute</span><span class="special">::</span><span class="identifier">device</span> <span class="identifier">device</span> <span class="special">=</span> <span class="identifier">compute</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">default_device</span><span class="special">();</span>
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<span class="identifier">compute</span><span class="special">::</span><span class="identifier">context</span> <span class="identifier">context</span><span class="special">(</span><span class="identifier">device</span><span class="special">);</span>
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<span class="identifier">compute</span><span class="special">::</span><span class="identifier">command_queue</span> <span class="identifier">queue</span><span class="special">(</span><span class="identifier">context</span><span class="special">,</span> <span class="identifier">device</span><span class="special">);</span>
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<span class="comment">// create data array on host</span>
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<span class="keyword">int</span> <span class="identifier">host_data</span><span class="special">[]</span> <span class="special">=</span> <span class="special">{</span> <span class="number">1</span><span class="special">,</span> <span class="number">3</span><span class="special">,</span> <span class="number">5</span><span class="special">,</span> <span class="number">7</span><span class="special">,</span> <span class="number">9</span> <span class="special">};</span>
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<span class="comment">// create vector on device</span>
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<span class="identifier">compute</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">device_vector</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="identifier">context</span><span class="special">);</span>
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<span class="comment">// copy from host to device</span>
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<span class="identifier">compute</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span>
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<span class="identifier">host_data</span><span class="special">,</span> <span class="identifier">host_data</span> <span class="special">+</span> <span class="number">5</span><span class="special">,</span> <span class="identifier">device_vector</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">queue</span>
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<span class="special">);</span>
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<span class="comment">// create vector on host</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">host_vector</span><span class="special">(</span><span class="number">5</span><span class="special">);</span>
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<span class="comment">// copy data back to host</span>
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<span class="identifier">compute</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span>
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<span class="identifier">device_vector</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">device_vector</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">host_vector</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">queue</span>
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<span class="special">);</span>
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<span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
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<span class="special">}</span>
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</pre>
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<p>
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</p>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
|
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<a name="boost_compute.tutorial.transforming_data"></a><a class="link" href="tutorial.html#boost_compute.tutorial.transforming_data" title="Transforming Data">Transforming
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Data</a>
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</h3></div></div></div>
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<p>
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The following example shows how to calculate the square-root of a vector
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of <code class="computeroutput"><span class="keyword">float</span></code>s on a compute device
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using the <code class="computeroutput"><a class="link" href="../boost/compute/transform.html" title="Function transform">transform()</a></code>
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function.
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</p>
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<p>
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</p>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span>
|
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">algorithm</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">compute</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transform</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">compute</span><span class="special">/</span><span class="identifier">container</span><span class="special">/</span><span class="identifier">vector</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">compute</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">math</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="keyword">namespace</span> <span class="identifier">compute</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">compute</span><span class="special">;</span>
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||
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<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
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||
<span class="special">{</span>
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<span class="comment">// get default device and setup context</span>
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||
<span class="identifier">compute</span><span class="special">::</span><span class="identifier">device</span> <span class="identifier">device</span> <span class="special">=</span> <span class="identifier">compute</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">default_device</span><span class="special">();</span>
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||
<span class="identifier">compute</span><span class="special">::</span><span class="identifier">context</span> <span class="identifier">context</span><span class="special">(</span><span class="identifier">device</span><span class="special">);</span>
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||
<span class="identifier">compute</span><span class="special">::</span><span class="identifier">command_queue</span> <span class="identifier">queue</span><span class="special">(</span><span class="identifier">context</span><span class="special">,</span> <span class="identifier">device</span><span class="special">);</span>
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||
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<span class="comment">// generate random data on the host</span>
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||
<span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">float</span><span class="special">></span> <span class="identifier">host_vector</span><span class="special">(</span><span class="number">10000</span><span class="special">);</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">generate</span><span class="special">(</span><span class="identifier">host_vector</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">host_vector</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">rand</span><span class="special">);</span>
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||
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<span class="comment">// create a vector on the device</span>
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||
<span class="identifier">compute</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">float</span><span class="special">></span> <span class="identifier">device_vector</span><span class="special">(</span><span class="identifier">host_vector</span><span class="special">.</span><span class="identifier">size</span><span class="special">(),</span> <span class="identifier">context</span><span class="special">);</span>
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||
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<span class="comment">// transfer data from the host to the device</span>
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<span class="identifier">compute</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span>
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<span class="identifier">host_vector</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">host_vector</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">device_vector</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">queue</span>
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<span class="special">);</span>
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<span class="comment">// calculate the square-root of each element in-place</span>
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||
<span class="identifier">compute</span><span class="special">::</span><span class="identifier">transform</span><span class="special">(</span>
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<span class="identifier">device_vector</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span>
|
||
<span class="identifier">device_vector</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span>
|
||
<span class="identifier">device_vector</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span>
|
||
<span class="identifier">compute</span><span class="special">::</span><span class="identifier">sqrt</span><span class="special"><</span><span class="keyword">float</span><span class="special">>(),</span>
|
||
<span class="identifier">queue</span>
|
||
<span class="special">);</span>
|
||
|
||
<span class="comment">// copy values back to the host</span>
|
||
<span class="identifier">compute</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span>
|
||
<span class="identifier">device_vector</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">device_vector</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">host_vector</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">queue</span>
|
||
<span class="special">);</span>
|
||
|
||
<span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
|
||
<span class="special">}</span>
|
||
</pre>
|
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<p>
|
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</p>
|
||
</div>
|
||
</div>
|
||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2013, 2014 Kyle Lutz<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>
|
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="design.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><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="advanced_topics.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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