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<h1>
<span class="m-breadcrumb"><a href="namespacetf.html">tf</a>::<wbr/></span>Task <span class="m-thin">class</span>
<div class="m-doc-include m-code m-inverted m-text-right"><span class="cp">#include</span> <a class="cpf" href="task_8hpp.html">&lt;taskflow/core/task.hpp&gt;</a></div>
</h1>
<p>class to create a task handle over a node in a taskflow graph</p>
<nav class="m-block m-default">
<h3>Contents</h3>
<ul>
<li>
Reference
<ul>
<li><a href="#typeless-methods">Constructors, destructors, conversion operators</a></li>
<li><a href="#pub-methods">Public functions</a></li>
</ul>
</li>
</ul>
</nav>
<p>A task is a wrapper over a node in a taskflow graph. It provides a set of methods for users to access and modify the attributes of the associated node in the taskflow graph. A task is very lightweight object (i.e., only storing a node pointer) that can be trivially copied around, and it does not own the lifetime of the associated node.</p>
<section id="typeless-methods">
<h2><a href="#typeless-methods">Constructors, destructors, conversion operators</a></h2>
<dl class="m-doc">
<dt id="a5ed7ba63e8eeaa0f21fe08c80aa474ba">
<span class="m-doc-wrap-bumper"><a href="#a5ed7ba63e8eeaa0f21fe08c80aa474ba" class="m-doc-self">Task</a>(</span><span class="m-doc-wrap">) <span class="m-label m-flat m-info">defaulted</span></span>
</dt>
<dd>constructs an empty task</dd>
<dt id="a53deffe60d7c758df4265aeb81063928">
<span class="m-doc-wrap-bumper"><a href="#a53deffe60d7c758df4265aeb81063928" class="m-doc-self">Task</a>(</span><span class="m-doc-wrap">const <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp; other)</span>
</dt>
<dd>constructs the task with the copy of the other task</dd>
</dl>
</section>
<section id="pub-methods">
<h2><a href="#pub-methods">Public functions</a></h2>
<dl class="m-doc">
<dt id="aebdcc47e47a119f261daab673a971458">
<span class="m-doc-wrap-bumper">auto <a href="#aebdcc47e47a119f261daab673a971458" class="m-doc-self">operator=</a>(</span><span class="m-doc-wrap">const <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp;) -&gt; <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp;</span>
</dt>
<dd>replaces the contents with a copy of the other task</dd>
<dt id="a4b0e3d6a1985a353626c15970c51c820">
<span class="m-doc-wrap-bumper">auto <a href="#a4b0e3d6a1985a353626c15970c51c820" class="m-doc-self">operator=</a>(</span><span class="m-doc-wrap"><a href="http://en.cppreference.com/w/cpp/types/nullptr_t.html" class="m-doc-external">std::<wbr />nullptr_t</a>) -&gt; <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp;</span>
</dt>
<dd>replaces the contents with a null pointer</dd>
<dt id="ad87bb498b0a4eae0c375bc59b66dbba8">
<span class="m-doc-wrap-bumper">auto <a href="#ad87bb498b0a4eae0c375bc59b66dbba8" class="m-doc-self">operator==</a>(</span><span class="m-doc-wrap">const <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp; rhs) const -&gt; bool</span>
</dt>
<dd>compares if two tasks are associated with the same graph node</dd>
<dt id="af4e13636e3a494297b30c2b2e483f095">
<span class="m-doc-wrap-bumper">auto <a href="#af4e13636e3a494297b30c2b2e483f095" class="m-doc-self">operator!=</a>(</span><span class="m-doc-wrap">const <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp; rhs) const -&gt; bool</span>
</dt>
<dd>compares if two tasks are not associated with the same graph node</dd>
<dt id="a08ada0425b490997b6ff7f310107e5e3">
<span class="m-doc-wrap-bumper">auto <a href="#a08ada0425b490997b6ff7f310107e5e3" class="m-doc-self">name</a>(</span><span class="m-doc-wrap">) const -&gt; const <a href="http://en.cppreference.com/w/cpp/string/basic_string.html" class="m-doc-external">std::<wbr />string</a>&amp;</span>
</dt>
<dd>queries the name of the task</dd>
<dt id="a1a0afc89e8a6a416c511e74d82df135d">
<span class="m-doc-wrap-bumper">auto <a href="#a1a0afc89e8a6a416c511e74d82df135d" class="m-doc-self">num_successors</a>(</span><span class="m-doc-wrap">) const -&gt; size_t</span>
</dt>
<dd>queries the number of successors of the task</dd>
<dt id="a974dc1d738b62b829ad261beeafbd67c">
<span class="m-doc-wrap-bumper">auto <a href="#a974dc1d738b62b829ad261beeafbd67c" class="m-doc-self">num_dependents</a>(</span><span class="m-doc-wrap">) const -&gt; size_t</span>
</dt>
<dd>queries the number of predecessors of the task</dd>
<dt id="ad49a92e8858c3c298bed0215e341b66b">
<span class="m-doc-wrap-bumper">auto <a href="#ad49a92e8858c3c298bed0215e341b66b" class="m-doc-self">num_strong_dependents</a>(</span><span class="m-doc-wrap">) const -&gt; size_t</span>
</dt>
<dd>queries the number of strong dependents of the task</dd>
<dt id="af3bf886291af7f39957d43d17083fe07">
<span class="m-doc-wrap-bumper">auto <a href="#af3bf886291af7f39957d43d17083fe07" class="m-doc-self">num_weak_dependents</a>(</span><span class="m-doc-wrap">) const -&gt; size_t</span>
</dt>
<dd>queries the number of weak dependents of the task</dd>
<dt>
<span class="m-doc-wrap-bumper">auto <a href="#a9057ecd0f3833b717480e914f8568f02" class="m-doc">name</a>(</span><span class="m-doc-wrap">const <a href="http://en.cppreference.com/w/cpp/string/basic_string.html" class="m-doc-external">std::<wbr />string</a>&amp; name) -&gt; <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp;</span>
</dt>
<dd>assigns a name to the task</dd>
<dt>
<div class="m-doc-template">template&lt;typename C&gt;</div>
<span class="m-doc-wrap-bumper">auto <a href="#a2f6f4cec42d016e5eb89390f362ffe99" class="m-doc">work</a>(</span><span class="m-doc-wrap">C&amp;&amp; callable) -&gt; <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp;</span>
</dt>
<dd>assigns a callable</dd>
<dt>
<div class="m-doc-template">template&lt;typename T&gt;</div>
<span class="m-doc-wrap-bumper">auto <a href="#ab38be520fe700cb4ca1f312308a95585" class="m-doc">composed_of</a>(</span><span class="m-doc-wrap">T&amp; object) -&gt; <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp;</span>
</dt>
<dd>creates a module task from a taskflow</dd>
<dt>
<div class="m-doc-template">template&lt;typename... Ts&gt;</div>
<span class="m-doc-wrap-bumper">auto <a href="#a8c78c453295a553c1c016e4062da8588" class="m-doc">precede</a>(</span><span class="m-doc-wrap">Ts &amp;&amp; ... tasks) -&gt; <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp;</span>
</dt>
<dd>adds precedence links from this to other tasks</dd>
<dt>
<div class="m-doc-template">template&lt;typename... Ts&gt;</div>
<span class="m-doc-wrap-bumper">auto <a href="#a331b1b726555072e7c7d10941257f664" class="m-doc">succeed</a>(</span><span class="m-doc-wrap">Ts &amp;&amp; ... tasks) -&gt; <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp;</span>
</dt>
<dd>adds precedence links from other tasks to this</dd>
<dt>
<span class="m-doc-wrap-bumper">auto <a href="#afd82ab6d6518d1142a72c4d2c97ff114" class="m-doc">data</a>(</span><span class="m-doc-wrap">void* data) -&gt; <a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp;</span>
</dt>
<dd>assigns pointer to user data</dd>
<dt id="a302f51ed717d0a4e99edc50f92a571f3">
<span class="m-doc-wrap-bumper">void <a href="#a302f51ed717d0a4e99edc50f92a571f3" class="m-doc-self">reset</a>(</span><span class="m-doc-wrap">)</span>
</dt>
<dd>resets the task handle to null</dd>
<dt id="aec3ab712e12137542b7e4bc311ee9f20">
<span class="m-doc-wrap-bumper">void <a href="#aec3ab712e12137542b7e4bc311ee9f20" class="m-doc-self">reset_work</a>(</span><span class="m-doc-wrap">)</span>
</dt>
<dd>resets the associated work to a placeholder</dd>
<dt id="a8149edcf9ec2bfac18dd171f7a55ce06">
<span class="m-doc-wrap-bumper">auto <a href="#a8149edcf9ec2bfac18dd171f7a55ce06" class="m-doc-self">empty</a>(</span><span class="m-doc-wrap">) const -&gt; bool</span>
</dt>
<dd>queries if the task handle points to a task node</dd>
<dt id="afc4ecb89dd4e4645b3ec3fb7c1bb0ec5">
<span class="m-doc-wrap-bumper">auto <a href="#afc4ecb89dd4e4645b3ec3fb7c1bb0ec5" class="m-doc-self">has_work</a>(</span><span class="m-doc-wrap">) const -&gt; bool</span>
</dt>
<dd>queries if the task has a work assigned</dd>
<dt id="aff13a503d4a3c994eb08cb6f22e1b427">
<div class="m-doc-template">template&lt;typename V&gt;</div>
<span class="m-doc-wrap-bumper">void <a href="#aff13a503d4a3c994eb08cb6f22e1b427" class="m-doc-self">for_each_successor</a>(</span><span class="m-doc-wrap">V&amp;&amp; visitor) const</span>
</dt>
<dd>applies an visitor callable to each successor of the task</dd>
<dt id="a3bf68937662bf291637e4a763476b2e4">
<div class="m-doc-template">template&lt;typename V&gt;</div>
<span class="m-doc-wrap-bumper">void <a href="#a3bf68937662bf291637e4a763476b2e4" class="m-doc-self">for_each_dependent</a>(</span><span class="m-doc-wrap">V&amp;&amp; visitor) const</span>
</dt>
<dd>applies an visitor callable to each dependents of the task</dd>
<dt id="a1c9301f2a330cc23ee18e8f61688141f">
<span class="m-doc-wrap-bumper">auto <a href="#a1c9301f2a330cc23ee18e8f61688141f" class="m-doc-self">hash_value</a>(</span><span class="m-doc-wrap">) const -&gt; size_t</span>
</dt>
<dd>obtains a hash value of the underlying node</dd>
<dt id="af2df95e6c8c5870c033d692e88af0bc2">
<span class="m-doc-wrap-bumper">auto <a href="#af2df95e6c8c5870c033d692e88af0bc2" class="m-doc-self">type</a>(</span><span class="m-doc-wrap">) const -&gt; <a href="namespacetf.html#a1355048578785a80414707ff308b395a" class="m-doc">TaskType</a></span>
</dt>
<dd>returns the task type</dd>
<dt id="a3318a49ff9d0a01cd1e8ee675251e3b7">
<span class="m-doc-wrap-bumper">void <a href="#a3318a49ff9d0a01cd1e8ee675251e3b7" class="m-doc-self">dump</a>(</span><span class="m-doc-wrap"><a href="http://en.cppreference.com/w/cpp/io/basic_ostream.html" class="m-doc-external">std::<wbr />ostream</a>&amp; ostream) const</span>
</dt>
<dd>dumps the task through an output stream</dd>
<dt id="a320827cb70295a6fe2cc37691405409c">
<span class="m-doc-wrap-bumper">auto <a href="#a320827cb70295a6fe2cc37691405409c" class="m-doc-self">data</a>(</span><span class="m-doc-wrap">) const -&gt; void*</span>
</dt>
<dd>queries pointer to user data</dd>
</dl>
</section>
<section>
<h2>Function documentation</h2>
<section class="m-doc-details" id="a9057ecd0f3833b717480e914f8568f02"><div>
<h3>
<span class="m-doc-wrap-bumper"><a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp; tf::<wbr />Task::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#a9057ecd0f3833b717480e914f8568f02" class="m-doc-self">name</a>(</span><span class="m-doc-wrap">const <a href="http://en.cppreference.com/w/cpp/string/basic_string.html" class="m-doc-external">std::<wbr />string</a>&amp; name)</span></span>
</h3>
<p>assigns a name to the task</p>
<table class="m-table m-fullwidth m-flat">
<thead>
<tr><th colspan="2">Parameters</th></tr>
</thead>
<tbody>
<tr>
<td style="width: 1%">name</td>
<td>a <a href="https://en.cppreference.com/w/cpp/string/basic_string">std::<wbr />string</a> acceptable string</td>
</tr>
</tbody>
<tfoot>
<tr>
<th>Returns</th>
<td><code>*this</code></td>
</tr>
</tfoot>
</table>
</div></section>
<section class="m-doc-details" id="a2f6f4cec42d016e5eb89390f362ffe99"><div>
<h3>
<div class="m-doc-template">
template&lt;typename C&gt;
</div>
<span class="m-doc-wrap-bumper"><a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp; tf::<wbr />Task::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#a2f6f4cec42d016e5eb89390f362ffe99" class="m-doc-self">work</a>(</span><span class="m-doc-wrap">C&amp;&amp; callable)</span></span>
</h3>
<p>assigns a callable</p>
<table class="m-table m-fullwidth m-flat">
<thead>
<tr><th colspan="2">Template parameters</th></tr>
</thead>
<tbody>
<tr>
<td style="width: 1%">C</td>
<td>callable type</td>
</tr>
</tbody>
<thead>
<tr><th colspan="2">Parameters</th></tr>
</thead>
<tbody>
<tr>
<td>callable</td>
<td>callable to construct a task</td>
</tr>
</tbody>
<tfoot>
<tr>
<th>Returns</th>
<td><code>*this</code></td>
</tr>
</tfoot>
</table>
</div></section>
<section class="m-doc-details" id="ab38be520fe700cb4ca1f312308a95585"><div>
<h3>
<div class="m-doc-template">
template&lt;typename T&gt;
</div>
<span class="m-doc-wrap-bumper"><a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp; tf::<wbr />Task::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#ab38be520fe700cb4ca1f312308a95585" class="m-doc-self">composed_of</a>(</span><span class="m-doc-wrap">T&amp; object)</span></span>
</h3>
<p>creates a module task from a taskflow</p>
<table class="m-table m-fullwidth m-flat">
<thead>
<tr><th colspan="2">Template parameters</th></tr>
</thead>
<tbody>
<tr>
<td style="width: 1%">T</td>
<td>object type</td>
</tr>
</tbody>
<thead>
<tr><th colspan="2">Parameters</th></tr>
</thead>
<tbody>
<tr>
<td>object</td>
<td>a custom object that defines <code>T::graph()</code> method</td>
</tr>
</tbody>
<tfoot>
<tr>
<th>Returns</th>
<td><code>*this</code></td>
</tr>
</tfoot>
</table>
</div></section>
<section class="m-doc-details" id="a8c78c453295a553c1c016e4062da8588"><div>
<h3>
<div class="m-doc-template">
template&lt;typename... Ts&gt;
</div>
<span class="m-doc-wrap-bumper"><a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp; tf::<wbr />Task::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#a8c78c453295a553c1c016e4062da8588" class="m-doc-self">precede</a>(</span><span class="m-doc-wrap">Ts &amp;&amp; ... tasks)</span></span>
</h3>
<p>adds precedence links from this to other tasks</p>
<table class="m-table m-fullwidth m-flat">
<thead>
<tr><th colspan="2">Template parameters</th></tr>
</thead>
<tbody>
<tr>
<td style="width: 1%">Ts</td>
<td>parameter pack</td>
</tr>
</tbody>
<thead>
<tr><th colspan="2">Parameters</th></tr>
</thead>
<tbody>
<tr>
<td>tasks</td>
<td>one or multiple tasks</td>
</tr>
</tbody>
<tfoot>
<tr>
<th>Returns</th>
<td><code>*this</code></td>
</tr>
</tfoot>
</table>
</div></section>
<section class="m-doc-details" id="a331b1b726555072e7c7d10941257f664"><div>
<h3>
<div class="m-doc-template">
template&lt;typename... Ts&gt;
</div>
<span class="m-doc-wrap-bumper"><a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp; tf::<wbr />Task::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#a331b1b726555072e7c7d10941257f664" class="m-doc-self">succeed</a>(</span><span class="m-doc-wrap">Ts &amp;&amp; ... tasks)</span></span>
</h3>
<p>adds precedence links from other tasks to this</p>
<table class="m-table m-fullwidth m-flat">
<thead>
<tr><th colspan="2">Template parameters</th></tr>
</thead>
<tbody>
<tr>
<td style="width: 1%">Ts</td>
<td>parameter pack</td>
</tr>
</tbody>
<thead>
<tr><th colspan="2">Parameters</th></tr>
</thead>
<tbody>
<tr>
<td>tasks</td>
<td>one or multiple tasks</td>
</tr>
</tbody>
<tfoot>
<tr>
<th>Returns</th>
<td><code>*this</code></td>
</tr>
</tfoot>
</table>
</div></section>
<section class="m-doc-details" id="afd82ab6d6518d1142a72c4d2c97ff114"><div>
<h3>
<span class="m-doc-wrap-bumper"><a href="classtf_1_1Task.html" class="m-doc">Task</a>&amp; tf::<wbr />Task::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#afd82ab6d6518d1142a72c4d2c97ff114" class="m-doc-self">data</a>(</span><span class="m-doc-wrap">void* data)</span></span>
</h3>
<p>assigns pointer to user data</p>
<table class="m-table m-fullwidth m-flat">
<thead>
<tr><th colspan="2">Parameters</th></tr>
</thead>
<tbody>
<tr>
<td style="width: 1%">data</td>
<td>pointer to user data</td>
</tr>
</tbody>
<tfoot>
<tr>
<th>Returns</th>
<td><code>*this</code></td>
</tr>
</tfoot>
</table>
<p>The following example shows how to attach user data to a task and run the task iteratively while changing the data value:</p><pre class="m-code"><span class="n">tf</span><span class="o">::</span><span class="n">Executor</span><span class="w"> </span><span class="n">executor</span><span class="p">;</span>
<span class="n">tf</span><span class="o">::</span><span class="n">Taskflow</span><span class="w"> </span><span class="nf">taskflow</span><span class="p">(</span><span class="s">&quot;attach data to a task&quot;</span><span class="p">);</span>
<span class="kt">int</span><span class="w"> </span><span class="n">data</span><span class="p">;</span>
<span class="c1">// create a task and attach it the data</span>
<span class="k">auto</span><span class="w"> </span><span class="n">A</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">taskflow</span><span class="p">.</span><span class="n">placeholder</span><span class="p">();</span>
<span class="n">A</span><span class="p">.</span><span class="n">data</span><span class="p">(</span><span class="o">&amp;</span><span class="n">data</span><span class="p">).</span><span class="n">work</span><span class="p">([</span><span class="n">A</span><span class="p">](){</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">d</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">*</span><span class="k">static_cast</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">*&gt;</span><span class="p">(</span><span class="n">A</span><span class="p">.</span><span class="n">data</span><span class="p">());</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="s">&quot;data is &quot;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="n">d</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">});</span>
<span class="c1">// run the taskflow iteratively with changing data</span>
<span class="k">for</span><span class="p">(</span><span class="n">data</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">data</span><span class="o">&lt;</span><span class="mi">10</span><span class="p">;</span><span class="w"> </span><span class="n">data</span><span class="o">++</span><span class="p">){</span>
<span class="w"> </span><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>
<span class="p">}</span></pre>
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