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<h1>
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<div class="m-doc-include m-code m-inverted m-right-m m-text-right"><span class="cp">#include</span> <a class="cpf" href="partitioner_8hpp.html"><taskflow/algorithm/partitioner.hpp></a></div>
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<div class="m-doc-template">template<typename C = <a href="structtf_1_1DefaultClosureWrapper.html" class="m-doc">DefaultClosureWrapper</a>></div>
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<span class="m-breadcrumb"><a href="namespacetf.html">tf</a>::<wbr/></span>DynamicPartitioner <span class="m-thin">class</span>
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</h1>
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<p>class to construct a dynamic partitioner for scheduling parallel algorithms</p>
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<table class="m-table m-fullwidth m-flat">
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<thead>
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<tr><th colspan="2">Template parameters</th></tr>
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<td style="width: 1%">C</td>
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<td>closure wrapper type (default <a href="structtf_1_1DefaultClosureWrapper.html" class="m-doc">tf::<wbr />DefaultClosureWrapper</a>)</td>
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<h3>Contents</h3>
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Reference
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<li><a href="#base-classes">Base classes</a></li>
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<li><a href="#pub-static-methods">Public static functions</a></li>
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<li><a href="#typeless-methods">Constructors, destructors, conversion operators</a></li>
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<p>The partitioner splits iterations into many partitions each of size equal to the given chunk size. Different partitions are distributed dynamically to workers without any specific order.</p><p>In addition to partition size, the application can specify a closure wrapper for a dynamic partitioner. A closure wrapper allows the application to wrapper a partitioned task (i.e., closure) with a custom function object that performs additional tasks. For example:</p><pre class="m-code"><span class="n">std</span><span class="o">::</span><span class="n">atomic</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">count</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
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<span class="n">tf</span><span class="o">::</span><span class="n">Taskflow</span><span class="w"> </span><span class="n">taskflow</span><span class="p">;</span>
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<span class="n">taskflow</span><span class="p">.</span><span class="n">for_each_index</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">100</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span>
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<span class="w"> </span><span class="p">[](){</span><span class="w"> </span>
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<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="s">"%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">i</span><span class="p">);</span><span class="w"> </span>
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<span class="w"> </span><span class="p">},</span>
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<span class="w"> </span><span class="n">tf</span><span class="o">::</span><span class="n">DynamicPartitioner</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="p">[](</span><span class="k">auto</span><span class="o">&&</span><span class="w"> </span><span class="n">closure</span><span class="p">){</span>
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<span class="w"> </span><span class="c1">// do something before invoking the partitioned task</span>
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<span class="w"> </span><span class="c1">// ...</span>
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<span class="w"> </span>
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<span class="w"> </span><span class="c1">// invoke the partitioned task</span>
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<span class="w"> </span><span class="n">closure</span><span class="p">();</span>
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<span class="w"> </span><span class="c1">// do something else after invoking the partitioned task</span>
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<span class="w"> </span><span class="c1">// ...</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="p">);</span>
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<span class="n">executor</span><span class="p">.</span><span class="n">run</span><span class="p">(</span><span class="n">taskflow</span><span class="p">).</span><span class="n">wait</span><span class="p">();</span></pre>
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<section id="base-classes">
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<h2><a href="#base-classes">Base classes</a></h2>
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<dl class="m-doc">
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<dt>
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<div class="m-doc-template">template<typename C = <a href="structtf_1_1DefaultClosureWrapper.html" class="m-doc">DefaultClosureWrapper</a>></div>
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class <a href="classtf_1_1PartitionerBase.html" class="m-doc">PartitionerBase<DefaultClosureWrapper></a>
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</dt>
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<dd>class to derive a partitioner for scheduling parallel algorithms</dd>
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</dl>
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</section>
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<section id="pub-static-methods">
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<h2><a href="#pub-static-methods">Public static functions</a></h2>
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<dl class="m-doc">
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<dt id="ab16dcd2758ad0059aa5ac7822f31f8a7">
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<span class="m-doc-wrap-bumper">static auto <a href="#ab16dcd2758ad0059aa5ac7822f31f8a7" class="m-doc-self">type</a>(</span><span class="m-doc-wrap">) -> <a href="namespacetf.html#a32d51425fa23cd0dc3518c16cf3bb6c0" class="m-doc">PartitionerType</a> <span class="m-label m-flat m-primary">constexpr</span></span>
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</dt>
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<dd>queries the partition type (dynamic)</dd>
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</dl>
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</section>
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<section id="typeless-methods">
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<h2><a href="#typeless-methods">Constructors, destructors, conversion operators</a></h2>
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<dl class="m-doc">
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<dt id="a2ff37845f4489df50f199f06a96590c8">
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<span class="m-doc-wrap-bumper"><a href="#a2ff37845f4489df50f199f06a96590c8" class="m-doc-self">DynamicPartitioner</a>(</span><span class="m-doc-wrap">) <span class="m-label m-flat m-info">defaulted</span></span>
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</dt>
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<dd>default constructor</dd>
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<dt id="ac1922e2796cba43d81e4567c9e2c0c76">
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<span class="m-doc-wrap-bumper"><a href="#ac1922e2796cba43d81e4567c9e2c0c76" class="m-doc-self">DynamicPartitioner</a>(</span><span class="m-doc-wrap">size_t sz) <span class="m-label m-flat m-info">explicit</span> </span>
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</dt>
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<dd>construct a dynamic partitioner with the given chunk size</dd>
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<dt id="a82c2ee7829e54b474e9b11e0944bc2cd">
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<span class="m-doc-wrap-bumper"><a href="#a82c2ee7829e54b474e9b11e0944bc2cd" class="m-doc-self">DynamicPartitioner</a>(</span><span class="m-doc-wrap">size_t sz,
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C&& closure) <span class="m-label m-flat m-info">explicit</span> </span>
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</dt>
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<dd>construct a dynamic partitioner with the given chunk size and the closure</dd>
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</dl>
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</section>
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<p>Taskflow handbook is part of the <a href="https://taskflow.github.io">Taskflow project</a>, copyright © <a href="https://tsung-wei-huang.github.io/">Dr. Tsung-Wei Huang</a>, 2018–2024.<br />Generated by <a href="https://doxygen.org/">Doxygen</a> 1.9.1 and <a href="https://mcss.mosra.cz/">m.css</a>.</p>
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