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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_1Emitter.html">Emitter</a></li> </ul>
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<p>General purpose event emitter.
<a href="classentt_1_1Emitter.html#details">More...</a></p>
<p><code>#include &lt;<a class="el" href="emitter_8hpp_source.html">emitter.hpp</a>&gt;</code></p>
<table class="memberdecls">
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structentt_1_1Emitter_1_1Connection.html">Connection</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generic connection type for events. <a href="structentt_1_1Emitter_1_1Connection.html#details">More...</a><br /></td></tr>
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template&lt;typename Event &gt; </td></tr>
<tr class="memitem:a1a5bb5d6a7626aec285cc73bfc1e80ef"><td class="memTemplItemLeft" align="right" valign="top">using&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#a1a5bb5d6a7626aec285cc73bfc1e80ef">Listener</a> = typename Handler&lt; Event &gt;::listener_type</td></tr>
<tr class="memdesc:a1a5bb5d6a7626aec285cc73bfc1e80ef"><td class="mdescLeft">&#160;</td><td class="mdescRight">Type of listeners accepted for the given event. <br /></td></tr>
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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_1Emitter.html#a69aedf4db58a11af9eb6c36859e951c8">Emitter</a> () ENTT_NOEXCEPT=default</td></tr>
<tr class="memdesc:a69aedf4db58a11af9eb6c36859e951c8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Default constructor. <br /></td></tr>
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<tr class="memitem:ac713dddc6b8f7b056e3c1a8979a4e271"><td class="memItemLeft" align="right" valign="top"><a id="ac713dddc6b8f7b056e3c1a8979a4e271"></a>
virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#ac713dddc6b8f7b056e3c1a8979a4e271">~Emitter</a> () ENTT_NOEXCEPT</td></tr>
<tr class="memdesc:ac713dddc6b8f7b056e3c1a8979a4e271"><td class="mdescLeft">&#160;</td><td class="mdescRight">Default destructor. <br /></td></tr>
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<tr class="memitem:ab4ee1e31a476217c9c8c5a9b9dfe856b"><td class="memItemLeft" align="right" valign="top"><a id="ab4ee1e31a476217c9c8c5a9b9dfe856b"></a>
&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#ab4ee1e31a476217c9c8c5a9b9dfe856b">Emitter</a> (const <a class="el" href="classentt_1_1Emitter.html">Emitter</a> &amp;)=delete</td></tr>
<tr class="memdesc:ab4ee1e31a476217c9c8c5a9b9dfe856b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Copying an emitter isn't allowed. <br /></td></tr>
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<tr class="memitem:aef84a369260e86a006c151ab4a9041a8"><td class="memItemLeft" align="right" valign="top"><a id="aef84a369260e86a006c151ab4a9041a8"></a>
&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#aef84a369260e86a006c151ab4a9041a8">Emitter</a> (<a class="el" href="classentt_1_1Emitter.html">Emitter</a> &amp;&amp;)=default</td></tr>
<tr class="memdesc:aef84a369260e86a006c151ab4a9041a8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Default move constructor. <br /></td></tr>
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<tr class="memitem:ace3403fe310953f720dbddff016fe715"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classentt_1_1Emitter.html">Emitter</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#ace3403fe310953f720dbddff016fe715">operator=</a> (const <a class="el" href="classentt_1_1Emitter.html">Emitter</a> &amp;)=delete</td></tr>
<tr class="memdesc:ace3403fe310953f720dbddff016fe715"><td class="mdescLeft">&#160;</td><td class="mdescRight">Copying an emitter isn't allowed. <a href="#ace3403fe310953f720dbddff016fe715">More...</a><br /></td></tr>
<tr class="separator:ace3403fe310953f720dbddff016fe715"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8d06e737c14bf6be779135529424ca64"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classentt_1_1Emitter.html">Emitter</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#a8d06e737c14bf6be779135529424ca64">operator=</a> (<a class="el" href="classentt_1_1Emitter.html">Emitter</a> &amp;&amp;)=default</td></tr>
<tr class="memdesc:a8d06e737c14bf6be779135529424ca64"><td class="mdescLeft">&#160;</td><td class="mdescRight">Default move assignment operator. <a href="#a8d06e737c14bf6be779135529424ca64">More...</a><br /></td></tr>
<tr class="separator:a8d06e737c14bf6be779135529424ca64"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab5141fd9793f53ef83af47c8c8a74b0e"><td class="memTemplParams" colspan="2">template&lt;typename Event , typename... Args&gt; </td></tr>
<tr class="memitem:ab5141fd9793f53ef83af47c8c8a74b0e"><td class="memTemplItemLeft" align="right" valign="top">void&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#ab5141fd9793f53ef83af47c8c8a74b0e">publish</a> (Args &amp;&amp;... args)</td></tr>
<tr class="memdesc:ab5141fd9793f53ef83af47c8c8a74b0e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Emits the given event. <a href="#ab5141fd9793f53ef83af47c8c8a74b0e">More...</a><br /></td></tr>
<tr class="separator:ab5141fd9793f53ef83af47c8c8a74b0e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a1df9a54b806806add57c3168cbb2bdf1"><td class="memTemplParams" colspan="2">template&lt;typename Event &gt; </td></tr>
<tr class="memitem:a1df9a54b806806add57c3168cbb2bdf1"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="structentt_1_1Emitter_1_1Connection.html">Connection</a>&lt; Event &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#a1df9a54b806806add57c3168cbb2bdf1">on</a> (<a class="el" href="classentt_1_1Emitter.html#a1a5bb5d6a7626aec285cc73bfc1e80ef">Listener</a>&lt; Event &gt; listener)</td></tr>
<tr class="memdesc:a1df9a54b806806add57c3168cbb2bdf1"><td class="mdescLeft">&#160;</td><td class="mdescRight">Registers a long-lived listener with the event emitter. <a href="#a1df9a54b806806add57c3168cbb2bdf1">More...</a><br /></td></tr>
<tr class="separator:a1df9a54b806806add57c3168cbb2bdf1"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a1145cc27235acf0e24e1956ba0b15393"><td class="memTemplParams" colspan="2">template&lt;typename Event &gt; </td></tr>
<tr class="memitem:a1145cc27235acf0e24e1956ba0b15393"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="structentt_1_1Emitter_1_1Connection.html">Connection</a>&lt; Event &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#a1145cc27235acf0e24e1956ba0b15393">once</a> (<a class="el" href="classentt_1_1Emitter.html#a1a5bb5d6a7626aec285cc73bfc1e80ef">Listener</a>&lt; Event &gt; listener)</td></tr>
<tr class="memdesc:a1145cc27235acf0e24e1956ba0b15393"><td class="mdescLeft">&#160;</td><td class="mdescRight">Registers a short-lived listener with the event emitter. <a href="#a1145cc27235acf0e24e1956ba0b15393">More...</a><br /></td></tr>
<tr class="separator:a1145cc27235acf0e24e1956ba0b15393"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab15f07d10744ce8aa74964fa5623375c"><td class="memTemplParams" colspan="2">template&lt;typename Event &gt; </td></tr>
<tr class="memitem:ab15f07d10744ce8aa74964fa5623375c"><td class="memTemplItemLeft" align="right" valign="top">void&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#ab15f07d10744ce8aa74964fa5623375c">erase</a> (<a class="el" href="structentt_1_1Emitter_1_1Connection.html">Connection</a>&lt; Event &gt; conn) ENTT_NOEXCEPT</td></tr>
<tr class="memdesc:ab15f07d10744ce8aa74964fa5623375c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Disconnects a listener from the event emitter. <a href="#ab15f07d10744ce8aa74964fa5623375c">More...</a><br /></td></tr>
<tr class="separator:ab15f07d10744ce8aa74964fa5623375c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a4e722d57776f3185e39386e6f252c56b"><td class="memTemplParams" colspan="2">template&lt;typename Event &gt; </td></tr>
<tr class="memitem:a4e722d57776f3185e39386e6f252c56b"><td class="memTemplItemLeft" align="right" valign="top">void&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#a4e722d57776f3185e39386e6f252c56b">clear</a> () ENTT_NOEXCEPT</td></tr>
<tr class="memdesc:a4e722d57776f3185e39386e6f252c56b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Disconnects all the listeners for the given event type. <a href="#a4e722d57776f3185e39386e6f252c56b">More...</a><br /></td></tr>
<tr class="separator:a4e722d57776f3185e39386e6f252c56b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a12ce32d79978c671a4d72532cd8e33f7"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#a12ce32d79978c671a4d72532cd8e33f7">clear</a> () ENTT_NOEXCEPT</td></tr>
<tr class="memdesc:a12ce32d79978c671a4d72532cd8e33f7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Disconnects all the listeners. <a href="#a12ce32d79978c671a4d72532cd8e33f7">More...</a><br /></td></tr>
<tr class="separator:a12ce32d79978c671a4d72532cd8e33f7"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a4c54c5f15827be561e2912f7e91d1a6f"><td class="memTemplParams" colspan="2">template&lt;typename Event &gt; </td></tr>
<tr class="memitem:a4c54c5f15827be561e2912f7e91d1a6f"><td class="memTemplItemLeft" align="right" valign="top">bool&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#a4c54c5f15827be561e2912f7e91d1a6f">empty</a> () const ENTT_NOEXCEPT</td></tr>
<tr class="memdesc:a4c54c5f15827be561e2912f7e91d1a6f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Checks if there are listeners registered for the specific event. <a href="#a4c54c5f15827be561e2912f7e91d1a6f">More...</a><br /></td></tr>
<tr class="separator:a4c54c5f15827be561e2912f7e91d1a6f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a733f11dc3c15aa910e3f2e6f167b62fd"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classentt_1_1Emitter.html#a733f11dc3c15aa910e3f2e6f167b62fd">empty</a> () const ENTT_NOEXCEPT</td></tr>
<tr class="memdesc:a733f11dc3c15aa910e3f2e6f167b62fd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Checks if there are listeners registered with the event emitter. <a href="#a733f11dc3c15aa910e3f2e6f167b62fd">More...</a><br /></td></tr>
<tr class="separator:a733f11dc3c15aa910e3f2e6f167b62fd"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename Derived&gt;<br />
class entt::Emitter&lt; Derived &gt;</h3>
<p>General purpose event emitter. </p>
<p>The emitter class template follows the CRTP idiom. To create a custom emitter type, derived classes must inherit directly from the base class as:</p>
<div class="fragment"><div class="line"><span class="keyword">struct </span>MyEmitter: <a class="code" href="classentt_1_1Emitter.html#a69aedf4db58a11af9eb6c36859e951c8">Emitter</a>&lt;MyEmitter&gt; {</div><div class="line"> <span class="comment">// ...</span></div><div class="line">}</div></div><!-- fragment --><p>Handlers for the type of events are created internally on the fly. It's not required to specify in advance the full list of accepted types.<br />
Moreover, whenever an event is published, an emitter provides the listeners with a reference to itself along with a const reference to the event. Therefore listeners have an handy way to work with it without incurring in the need of capturing a reference to the emitter.</p>
<dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">Derived</td><td>Actual type of emitter that extends the class template. </td></tr>
</table>
</dd>
</dl>
<p class="definition">Definition at line <a class="el" href="emitter_8hpp_source.html#l00042">42</a> of file <a class="el" href="emitter_8hpp_source.html">emitter.hpp</a>.</p>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="a4e722d57776f3185e39386e6f252c56b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4e722d57776f3185e39386e6f252c56b">&#9670;&nbsp;</a></span>clear() <span class="overload">[1/2]</span></h2>
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template&lt;typename Derived &gt; </div>
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<p>Disconnects all the listeners for the given event type. </p>
<p>All the connections previously returned for the given event are invalidated. Using them results in undefined behavior.</p>
<dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">Event</td><td>Type of event to reset. </td></tr>
</table>
</dd>
</dl>
<p class="definition">Definition at line <a class="el" href="emitter_8hpp_source.html#l00288">288</a> of file <a class="el" href="emitter_8hpp_source.html">emitter.hpp</a>.</p>
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<a id="a12ce32d79978c671a4d72532cd8e33f7"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a12ce32d79978c671a4d72532cd8e33f7">&#9670;&nbsp;</a></span>clear() <span class="overload">[2/2]</span></h2>
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<p>Disconnects all the listeners. </p>
<p>All the connections previously returned are invalidated. Using them results in undefined behavior. </p>
<p class="definition">Definition at line <a class="el" href="emitter_8hpp_source.html#l00298">298</a> of file <a class="el" href="emitter_8hpp_source.html">emitter.hpp</a>.</p>
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<a id="a4c54c5f15827be561e2912f7e91d1a6f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4c54c5f15827be561e2912f7e91d1a6f">&#9670;&nbsp;</a></span>empty() <span class="overload">[1/2]</span></h2>
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<p>Checks if there are listeners registered for the specific event. </p>
<dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">Event</td><td>Type of event to test. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>True if there are no listeners registered, false otherwise. </dd></dl>
<p class="definition">Definition at line <a class="el" href="emitter_8hpp_source.html#l00310">310</a> of file <a class="el" href="emitter_8hpp_source.html">emitter.hpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a733f11dc3c15aa910e3f2e6f167b62fd">&#9670;&nbsp;</a></span>empty() <span class="overload">[2/2]</span></h2>
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<td class="memname">bool <a class="el" href="classentt_1_1Emitter.html">entt::Emitter</a>&lt; Derived &gt;::empty </td>
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<p>Checks if there are listeners registered with the event emitter. </p>
<dl class="section return"><dt>Returns</dt><dd>True if there are no listeners registered, false otherwise. </dd></dl>
<p class="definition">Definition at line <a class="el" href="emitter_8hpp_source.html#l00322">322</a> of file <a class="el" href="emitter_8hpp_source.html">emitter.hpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ab15f07d10744ce8aa74964fa5623375c">&#9670;&nbsp;</a></span>erase()</h2>
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<td class="memname">void <a class="el" href="classentt_1_1Emitter.html">entt::Emitter</a>&lt; Derived &gt;::erase </td>
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<p>Disconnects a listener from the event emitter. </p>
<p>Do not use twice the same connection to disconnect a listener, it results in undefined behavior. Once used, discard the connection object.</p>
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<tr><td class="paramname">Event</td><td>Type of event of the connection. </td></tr>
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<p class="definition">Definition at line <a class="el" href="emitter_8hpp_source.html#l00275">275</a> of file <a class="el" href="emitter_8hpp_source.html">emitter.hpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1df9a54b806806add57c3168cbb2bdf1">&#9670;&nbsp;</a></span>on()</h2>
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<td class="memname"><a class="el" href="structentt_1_1Emitter_1_1Connection.html">Connection</a>&lt;Event&gt; <a class="el" href="classentt_1_1Emitter.html">entt::Emitter</a>&lt; Derived &gt;::on </td>
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<p>Registers a long-lived listener with the event emitter. </p>
<p>This method can be used to register a listener designed to be invoked more than once for the given event type.<br />
The connection returned by the method can be freely discarded. It's meant to be used later to disconnect the listener if required.</p>
<p>The listener is as a callable object that can be moved and the type of which is <code>void(const Event &amp;, Derived &amp;)</code>.</p>
<dl class="section note"><dt>Note</dt><dd>Whenever an event is emitted, the emitter provides the listener with a reference to the derived class. Listeners don't have to capture those instances for later uses.</dd></dl>
<dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">Event</td><td>Type of event to which to connect the listener. </td></tr>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">listener</td><td>The listener to register. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd><a class="el" href="structentt_1_1Emitter_1_1Connection.html" title="Generic connection type for events. ">Connection</a> object that can be used to disconnect the listener. </dd></dl>
<p class="definition">Definition at line <a class="el" href="emitter_8hpp_source.html#l00236">236</a> of file <a class="el" href="emitter_8hpp_source.html">emitter.hpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1145cc27235acf0e24e1956ba0b15393">&#9670;&nbsp;</a></span>once()</h2>
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<p>Registers a short-lived listener with the event emitter. </p>
<p>This method can be used to register a listener designed to be invoked only once for the given event type.<br />
The connection returned by the method can be freely discarded. It's meant to be used later to disconnect the listener if required.</p>
<p>The listener is as a callable object that can be moved and the type of which is <code>void(const Event &amp;, Derived &amp;)</code>.</p>
<dl class="section note"><dt>Note</dt><dd>Whenever an event is emitted, the emitter provides the listener with a reference to the derived class. Listeners don't have to capture those instances for later uses.</dd></dl>
<dl class="tparams"><dt>Template Parameters</dt><dd>
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<tr><td class="paramname">Event</td><td>Type of event to which to connect the listener. </td></tr>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">listener</td><td>The listener to register. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd><a class="el" href="structentt_1_1Emitter_1_1Connection.html" title="Generic connection type for events. ">Connection</a> object that can be used to disconnect the listener. </dd></dl>
<p class="definition">Definition at line <a class="el" href="emitter_8hpp_source.html#l00261">261</a> of file <a class="el" href="emitter_8hpp_source.html">emitter.hpp</a>.</p>
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<td class="memname"><a class="el" href="classentt_1_1Emitter.html">Emitter</a>&amp; <a class="el" href="classentt_1_1Emitter.html">entt::Emitter</a>&lt; Derived &gt;::operator= </td>
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<p>Copying an emitter isn't allowed. </p>
<dl class="section return"><dt>Returns</dt><dd>This emitter. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a8d06e737c14bf6be779135529424ca64">&#9670;&nbsp;</a></span>operator=() <span class="overload">[2/2]</span></h2>
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<td class="memname"><a class="el" href="classentt_1_1Emitter.html">Emitter</a>&amp; <a class="el" href="classentt_1_1Emitter.html">entt::Emitter</a>&lt; Derived &gt;::operator= </td>
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<p>Default move assignment operator. </p>
<dl class="section return"><dt>Returns</dt><dd>This emitter. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ab5141fd9793f53ef83af47c8c8a74b0e">&#9670;&nbsp;</a></span>publish()</h2>
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<p>Emits the given event. </p>
<p>All the listeners registered for the specific event type are invoked with the given event. The event type must either have a proper constructor for the arguments provided or be an aggregate type.</p>
<dl class="tparams"><dt>Template Parameters</dt><dd>
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<tr><td class="paramname">Event</td><td>Type of event to publish. </td></tr>
<tr><td class="paramname">Args</td><td>Types of arguments to use to construct the event. </td></tr>
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<tr><td class="paramname">args</td><td>Parameters to use to initialize the event. </td></tr>
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<p class="definition">Definition at line <a class="el" href="emitter_8hpp_source.html#l00211">211</a> of file <a class="el" href="emitter_8hpp_source.html">emitter.hpp</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>src/entt/signal/<a class="el" href="emitter_8hpp_source.html">emitter.hpp</a></li>
</ul>
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