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Michele Caini 1546c8982e API reference v3.8.0
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<li class="navelem"><a class="el" href="namespaceentt.html">entt</a></li><li class="navelem"><a class="el" href="classentt_1_1scheduler.html">scheduler</a></li> </ul>
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<div class="title">entt::scheduler&lt; Delta &gt; Class Template Reference</div> </div>
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<p>Cooperative scheduler for processes.
<a href="classentt_1_1scheduler.html#details">More...</a></p>
<p><code>#include &lt;<a class="el" href="scheduler_8hpp_source.html">scheduler.hpp</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:afcec47d6ec28a994af2a7097348ce59f"><td class="memItemLeft" align="right" valign="top"><a id="afcec47d6ec28a994af2a7097348ce59f"></a>
using&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#afcec47d6ec28a994af2a7097348ce59f">size_type</a> = std::size_t</td></tr>
<tr class="memdesc:afcec47d6ec28a994af2a7097348ce59f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Unsigned integer type. <br /></td></tr>
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</table><table class="memberdecls">
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Public Member Functions</h2></td></tr>
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&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#a49a81e662dc26831f4a951a715705d6e">scheduler</a> ()=default</td></tr>
<tr class="memdesc:a49a81e662dc26831f4a951a715705d6e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Default constructor. <br /></td></tr>
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<tr class="memitem:af582ffea72368a83ea4dd7d9e563f715"><td class="memItemLeft" align="right" valign="top"><a id="af582ffea72368a83ea4dd7d9e563f715"></a>
&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#af582ffea72368a83ea4dd7d9e563f715">scheduler</a> (<a class="el" href="classentt_1_1scheduler.html">scheduler</a> &amp;&amp;)=default</td></tr>
<tr class="memdesc:af582ffea72368a83ea4dd7d9e563f715"><td class="mdescLeft">&#160;</td><td class="mdescRight">Default move constructor. <br /></td></tr>
<tr class="separator:af582ffea72368a83ea4dd7d9e563f715"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aea6ab78dbf00ba17c6e828ee0505afd9"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classentt_1_1scheduler.html">scheduler</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#aea6ab78dbf00ba17c6e828ee0505afd9">operator=</a> (<a class="el" href="classentt_1_1scheduler.html">scheduler</a> &amp;&amp;)=default</td></tr>
<tr class="memdesc:aea6ab78dbf00ba17c6e828ee0505afd9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Default move assignment operator. <a href="classentt_1_1scheduler.html#aea6ab78dbf00ba17c6e828ee0505afd9">More...</a><br /></td></tr>
<tr class="separator:aea6ab78dbf00ba17c6e828ee0505afd9"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a137d1d00e30f8840051adb5002a69bc5"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classentt_1_1scheduler.html#afcec47d6ec28a994af2a7097348ce59f">size_type</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#a137d1d00e30f8840051adb5002a69bc5">size</a> () const</td></tr>
<tr class="memdesc:a137d1d00e30f8840051adb5002a69bc5"><td class="mdescLeft">&#160;</td><td class="mdescRight">Number of processes currently scheduled. <a href="classentt_1_1scheduler.html#a137d1d00e30f8840051adb5002a69bc5">More...</a><br /></td></tr>
<tr class="separator:a137d1d00e30f8840051adb5002a69bc5"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:af12c8d59db78f91c3fdc144e90f24155"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#af12c8d59db78f91c3fdc144e90f24155">empty</a> () const</td></tr>
<tr class="memdesc:af12c8d59db78f91c3fdc144e90f24155"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns true if at least a process is currently scheduled. <a href="classentt_1_1scheduler.html#af12c8d59db78f91c3fdc144e90f24155">More...</a><br /></td></tr>
<tr class="separator:af12c8d59db78f91c3fdc144e90f24155"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5a0f92dbe54b58751237a567e86805e0"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#a5a0f92dbe54b58751237a567e86805e0">clear</a> ()</td></tr>
<tr class="memdesc:a5a0f92dbe54b58751237a567e86805e0"><td class="mdescLeft">&#160;</td><td class="mdescRight">Discards all scheduled processes. <a href="classentt_1_1scheduler.html#a5a0f92dbe54b58751237a567e86805e0">More...</a><br /></td></tr>
<tr class="separator:a5a0f92dbe54b58751237a567e86805e0"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a729c83e1983123c642a08cda67e486e3"><td class="memTemplParams" colspan="2">template&lt;typename Proc , typename... Args&gt; </td></tr>
<tr class="memitem:a729c83e1983123c642a08cda67e486e3"><td class="memTemplItemLeft" align="right" valign="top">auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#a729c83e1983123c642a08cda67e486e3">attach</a> (Args &amp;&amp;... args)</td></tr>
<tr class="memdesc:a729c83e1983123c642a08cda67e486e3"><td class="mdescLeft">&#160;</td><td class="mdescRight">Schedules a process for the next tick. <a href="classentt_1_1scheduler.html#a729c83e1983123c642a08cda67e486e3">More...</a><br /></td></tr>
<tr class="separator:a729c83e1983123c642a08cda67e486e3"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a871812d08af8483316d1ce5d1e9d686f"><td class="memTemplParams" colspan="2">template&lt;typename Func &gt; </td></tr>
<tr class="memitem:a871812d08af8483316d1ce5d1e9d686f"><td class="memTemplItemLeft" align="right" valign="top">auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#a871812d08af8483316d1ce5d1e9d686f">attach</a> (Func &amp;&amp;func)</td></tr>
<tr class="memdesc:a871812d08af8483316d1ce5d1e9d686f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Schedules a process for the next tick. <a href="classentt_1_1scheduler.html#a871812d08af8483316d1ce5d1e9d686f">More...</a><br /></td></tr>
<tr class="separator:a871812d08af8483316d1ce5d1e9d686f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a827eae426378df9ed9190752156a4154"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#a827eae426378df9ed9190752156a4154">update</a> (const Delta delta, void *data=nullptr)</td></tr>
<tr class="memdesc:a827eae426378df9ed9190752156a4154"><td class="mdescLeft">&#160;</td><td class="mdescRight">Updates all scheduled processes. <a href="classentt_1_1scheduler.html#a827eae426378df9ed9190752156a4154">More...</a><br /></td></tr>
<tr class="separator:a827eae426378df9ed9190752156a4154"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aabc25388bff1b3b0770f913f54b915f2"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1scheduler.html#aabc25388bff1b3b0770f913f54b915f2">abort</a> (const bool immediately=false)</td></tr>
<tr class="memdesc:aabc25388bff1b3b0770f913f54b915f2"><td class="mdescLeft">&#160;</td><td class="mdescRight">Aborts all scheduled processes. <a href="classentt_1_1scheduler.html#aabc25388bff1b3b0770f913f54b915f2">More...</a><br /></td></tr>
<tr class="separator:aabc25388bff1b3b0770f913f54b915f2"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename Delta&gt;<br />
class entt::scheduler&lt; Delta &gt;</h3>
<p>Cooperative scheduler for processes. </p>
<p>A cooperative scheduler runs processes and helps managing their life cycles.</p>
<p>Each process is invoked once per tick. If a process terminates, it's removed automatically from the scheduler and it's never invoked again.<br />
A process can also have a child. In this case, the process is replaced with its child when it terminates if it returns with success. In case of errors, both the process and its child are discarded.</p>
<p>Example of use (pseudocode):</p>
<div class="fragment"><div class="line"><a class="code" href="classentt_1_1scheduler.html#a49a81e662dc26831f4a951a715705d6e">scheduler</a>.attach([](<span class="keyword">auto</span> delta, <span class="keywordtype">void</span> *, <span class="keyword">auto</span> succeed, <span class="keyword">auto</span> fail) {</div>
<div class="line"> <span class="comment">// code</span></div>
<div class="line">}).then&lt;my_process&gt;(arguments...);</div>
<div class="ttc" id="aclassentt_1_1scheduler_html_a49a81e662dc26831f4a951a715705d6e"><div class="ttname"><a href="classentt_1_1scheduler.html#a49a81e662dc26831f4a951a715705d6e">entt::scheduler::scheduler</a></div><div class="ttdeci">scheduler()=default</div><div class="ttdoc">Default constructor.</div></div>
</div><!-- fragment --><p>In order to invoke all scheduled processes, call the <code>update</code> member function passing it the elapsed time to forward to the tasks.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="classentt_1_1process.html" title="Base class for processes.">process</a></dd></dl>
<dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">Delta</td><td>Type to use to provide elapsed time. </td></tr>
</table>
</dd>
</dl>
<p class="definition">Definition at line <a class="el" href="scheduler_8hpp_source.html#l00044">44</a> of file <a class="el" href="scheduler_8hpp_source.html">scheduler.hpp</a>.</p>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="aabc25388bff1b3b0770f913f54b915f2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aabc25388bff1b3b0770f913f54b915f2">&#9670;&nbsp;</a></span>abort()</h2>
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<div class="memtemplate">
template&lt;typename Delta &gt; </div>
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<td class="memname">void <a class="el" href="classentt_1_1scheduler.html">entt::scheduler</a>&lt; Delta &gt;::abort </td>
<td>(</td>
<td class="paramtype">const bool&#160;</td>
<td class="paramname"><em>immediately</em> = <code>false</code></td><td>)</td>
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<p>Aborts all scheduled processes. </p>
<p>Unless an immediate operation is requested, the abort is scheduled for the next tick. Processes won't be executed anymore in any case.<br />
Once a process is fully aborted and thus finished, it's discarded along with its child, if any.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">immediately</td><td>Requests an immediate operation. </td></tr>
</table>
</dd>
</dl>
<p class="definition">Definition at line <a class="el" href="scheduler_8hpp_source.html#l00276">276</a> of file <a class="el" href="scheduler_8hpp_source.html">scheduler.hpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a729c83e1983123c642a08cda67e486e3">&#9670;&nbsp;</a></span>attach() <span class="overload">[1/2]</span></h2>
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template&lt;typename Delta &gt; </div>
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template&lt;typename Proc , typename... Args&gt; </div>
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<td>(</td>
<td class="paramtype">Args &amp;&amp;...&#160;</td>
<td class="paramname"><em>args</em></td><td>)</td>
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<p>Schedules a process for the next tick. </p>
<p>Returned value is an opaque object that can be used to attach a child to the given process. The child is automatically scheduled when the process terminates and only if the process returns with success.</p>
<p>Example of use (pseudocode):</p>
<div class="fragment"><div class="line"><span class="comment">// schedules a task in the form of a process class</span></div>
<div class="line"><a class="code" href="classentt_1_1scheduler.html#a49a81e662dc26831f4a951a715705d6e">scheduler</a>.attach&lt;my_process&gt;(arguments...)</div>
<div class="line"><span class="comment">// appends a child in the form of a lambda function</span></div>
<div class="line">.then([](<span class="keyword">auto</span> delta, <span class="keywordtype">void</span> *, <span class="keyword">auto</span> succeed, <span class="keyword">auto</span> fail) {</div>
<div class="line"> <span class="comment">// code</span></div>
<div class="line">})</div>
<div class="line"><span class="comment">// appends a child in the form of another process class</span></div>
<div class="line">.then&lt;my_other_process&gt;();</div>
</div><!-- fragment --><dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">Proc</td><td>Type of process to schedule. </td></tr>
<tr><td class="paramname">Args</td><td>Types of arguments to use to initialize the process. </td></tr>
</table>
</dd>
</dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">args</td><td>Parameters to use to initialize the process. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>An opaque object to use to concatenate processes. </dd></dl>
<p class="definition">Definition at line <a class="el" href="scheduler_8hpp_source.html#l00175">175</a> of file <a class="el" href="scheduler_8hpp_source.html">scheduler.hpp</a>.</p>
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<a id="a871812d08af8483316d1ce5d1e9d686f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a871812d08af8483316d1ce5d1e9d686f">&#9670;&nbsp;</a></span>attach() <span class="overload">[2/2]</span></h2>
<div class="memitem">
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<div class="memtemplate">
template&lt;typename Delta &gt; </div>
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<td class="paramname"><em>func</em></td><td>)</td>
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<p>Schedules a process for the next tick. </p>
<p>A process can be either a lambda or a functor. The scheduler wraps both of them in a process adaptor internally.<br />
The signature of the function call operator should be equivalent to the following:</p>
<div class="fragment"><div class="line">void(Delta delta, <span class="keywordtype">void</span> *data, <span class="keyword">auto</span> succeed, <span class="keyword">auto</span> fail);</div>
</div><!-- fragment --><p>Where:</p>
<ul>
<li><code>delta</code> is the elapsed time.</li>
<li><code>data</code> is an opaque pointer to user data if any, <code>nullptr</code> otherwise.</li>
<li><code>succeed</code> is a function to call when a process terminates with success.</li>
<li><code>fail</code> is a function to call when a process terminates with errors.</li>
</ul>
<p>The signature of the function call operator of both <code>succeed</code> and <code>fail</code> is equivalent to the following:</p>
<div class="fragment"><div class="line">void();</div>
</div><!-- fragment --><p>Returned value is an opaque object that can be used to attach a child to the given process. The child is automatically scheduled when the process terminates and only if the process returns with success.</p>
<p>Example of use (pseudocode):</p>
<div class="fragment"><div class="line"><span class="comment">// schedules a task in the form of a lambda function</span></div>
<div class="line"><a class="code" href="classentt_1_1scheduler.html#a49a81e662dc26831f4a951a715705d6e">scheduler</a>.attach([](<span class="keyword">auto</span> delta, <span class="keywordtype">void</span> *, <span class="keyword">auto</span> succeed, <span class="keyword">auto</span> fail) {</div>
<div class="line"> <span class="comment">// code</span></div>
<div class="line">})</div>
<div class="line"><span class="comment">// appends a child in the form of another lambda function</span></div>
<div class="line">.then([](<span class="keyword">auto</span> delta, <span class="keywordtype">void</span> *, <span class="keyword">auto</span> succeed, <span class="keyword">auto</span> fail) {</div>
<div class="line"> <span class="comment">// code</span></div>
<div class="line">})</div>
<div class="line"><span class="comment">// appends a child in the form of a process class</span></div>
<div class="line">.then&lt;my_process&gt;(arguments...);</div>
</div><!-- fragment --><dl class="section see"><dt>See also</dt><dd><a class="el" href="structentt_1_1process__adaptor.html" title="Adaptor for lambdas and functors to turn them into processes.">process_adaptor</a></dd></dl>
<dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">Func</td><td>Type of process to schedule. </td></tr>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">func</td><td>Either a lambda or a functor to use as a process. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>An opaque object to use to concatenate processes. </dd></dl>
<p class="definition">Definition at line <a class="el" href="scheduler_8hpp_source.html#l00236">236</a> of file <a class="el" href="scheduler_8hpp_source.html">scheduler.hpp</a>.</p>
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<p>Discards all scheduled processes. </p>
<p>Processes aren't aborted. They are discarded along with their children and never executed again. </p>
<p class="definition">Definition at line <a class="el" href="scheduler_8hpp_source.html#l00145">145</a> of file <a class="el" href="scheduler_8hpp_source.html">scheduler.hpp</a>.</p>
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<p>Returns true if at least a process is currently scheduled. </p>
<dl class="section return"><dt>Returns</dt><dd>True if there are scheduled processes, false otherwise. </dd></dl>
<p class="definition">Definition at line <a class="el" href="scheduler_8hpp_source.html#l00135">135</a> of file <a class="el" href="scheduler_8hpp_source.html">scheduler.hpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aea6ab78dbf00ba17c6e828ee0505afd9">&#9670;&nbsp;</a></span>operator=()</h2>
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<p>Default move assignment operator. </p>
<dl class="section return"><dt>Returns</dt><dd>This scheduler. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a137d1d00e30f8840051adb5002a69bc5">&#9670;&nbsp;</a></span>size()</h2>
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<p>Number of processes currently scheduled. </p>
<dl class="section return"><dt>Returns</dt><dd>Number of processes currently scheduled. </dd></dl>
<p class="definition">Definition at line <a class="el" href="scheduler_8hpp_source.html#l00127">127</a> of file <a class="el" href="scheduler_8hpp_source.html">scheduler.hpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a827eae426378df9ed9190752156a4154">&#9670;&nbsp;</a></span>update()</h2>
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<p>Updates all scheduled processes. </p>
<p>All scheduled processes are executed in no specific order.<br />
If a process terminates with success, it's replaced with its child, if any. Otherwise, if a process terminates with an error, it's removed along with its child.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">delta</td><td>Elapsed time. </td></tr>
<tr><td class="paramname">data</td><td>Optional data. </td></tr>
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<p class="definition">Definition at line <a class="el" href="scheduler_8hpp_source.html#l00252">252</a> of file <a class="el" href="scheduler_8hpp_source.html">scheduler.hpp</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>src/entt/process/<a class="el" href="scheduler_8hpp_source.html">scheduler.hpp</a></li>
</ul>
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