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<a href="#pub-methods">Public Member Functions</a> |
<a href="#pro-methods">Protected Member Functions</a> |
<a href="#friends">Friends</a> |
<a href="classdpp_1_1event__router__t-members.html">List of all members</a> </div>
<div class="headertitle"><div class="title">dpp::event_router_t< T > Class Template Reference</div></div>
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<p>Handles routing of an event to multiple listeners. Multiple listeners may attach to the <a class="el" href="classdpp_1_1event__router__t.html" title="Handles routing of an event to multiple listeners. Multiple listeners may attach to the event_router_...">event_router_t</a> by means of <a class="el" href="classdpp_1_1event__router__t.html#a1abf0dab2344fad5d1ce20d79c87dac0">operator()</a>. Passing a lambda into <a class="el" href="classdpp_1_1event__router__t.html#a1abf0dab2344fad5d1ce20d79c87dac0">operator()</a> attaches to the event.
<a href="classdpp_1_1event__router__t.html#details">More...</a></p>
<p><code>#include <event_router.h></code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-methods" name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a5ead27e7e608a86b4622021fddb384c3"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a5ead27e7e608a86b4622021fddb384c3">event_router_t</a> ()=default</td></tr>
<tr class="memdesc:a5ead27e7e608a86b4622021fddb384c3"><td class="mdescLeft"> </td><td class="mdescRight">Construct a new <a class="el" href="classdpp_1_1event__router__t.html" title="Handles routing of an event to multiple listeners. Multiple listeners may attach to the event_router_...">event_router_t</a> object. <a href="classdpp_1_1event__router__t.html#a5ead27e7e608a86b4622021fddb384c3">More...</a><br /></td></tr>
<tr class="separator:a5ead27e7e608a86b4622021fddb384c3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a17b89d58a79e87083b060a9c0800a8c5"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a17b89d58a79e87083b060a9c0800a8c5">~event_router_t</a> ()</td></tr>
<tr class="memdesc:a17b89d58a79e87083b060a9c0800a8c5"><td class="mdescLeft"> </td><td class="mdescRight">Destructor. Will cancel any coroutine awaiting on events. <a href="classdpp_1_1event__router__t.html#a17b89d58a79e87083b060a9c0800a8c5">More...</a><br /></td></tr>
<tr class="separator:a17b89d58a79e87083b060a9c0800a8c5"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8099d8f317b52a9e9a2e5c6b248a73a3"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a8099d8f317b52a9e9a2e5c6b248a73a3">call</a> (const T &event) const</td></tr>
<tr class="memdesc:a8099d8f317b52a9e9a2e5c6b248a73a3"><td class="mdescLeft"> </td><td class="mdescRight">Call all attached listeners. Listeners may cancel, by calling the event.cancel method. <a href="classdpp_1_1event__router__t.html#a8099d8f317b52a9e9a2e5c6b248a73a3">More...</a><br /></td></tr>
<tr class="separator:a8099d8f317b52a9e9a2e5c6b248a73a3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a36d1120fa6ea95b44bd34cdf8cdcf9d4"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a36d1120fa6ea95b44bd34cdf8cdcf9d4">call</a> (T &&event) const</td></tr>
<tr class="memdesc:a36d1120fa6ea95b44bd34cdf8cdcf9d4"><td class="mdescLeft"> </td><td class="mdescRight">Call all attached listeners. Listeners may cancel, by calling the event.cancel method. <a href="classdpp_1_1event__router__t.html#a36d1120fa6ea95b44bd34cdf8cdcf9d4">More...</a><br /></td></tr>
<tr class="separator:a36d1120fa6ea95b44bd34cdf8cdcf9d4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a16c2527f66c8b74e5c0678ace4fa549e"><td class="memTemplParams" colspan="2">template<typename Predicate > </td></tr>
<tr class="memitem:a16c2527f66c8b74e5c0678ace4fa549e"><td class="memTemplItemLeft" align="right" valign="top">auto </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a16c2527f66c8b74e5c0678ace4fa549e">when</a> (Predicate &&pred)</td></tr>
<tr class="memdesc:a16c2527f66c8b74e5c0678ace4fa549e"><td class="mdescLeft"> </td><td class="mdescRight">Obtain an awaitable object that refers to an event with a certain condition. It can be co_await-ed to wait for the next event that satisfies this condition. On resumption the awaiter will be given <b>a reference</b> to the event, saving it in a variable is recommended to avoid variable lifetime issues. <a href="classdpp_1_1event__router__t.html#a16c2527f66c8b74e5c0678ace4fa549e">More...</a><br /></td></tr>
<tr class="separator:a16c2527f66c8b74e5c0678ace4fa549e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2223cf644fac6d4ab67b59236af4e63c"><td class="memItemLeft" align="right" valign="top">auto </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a2223cf644fac6d4ab67b59236af4e63c">operator co_await</a> () noexcept</td></tr>
<tr class="memdesc:a2223cf644fac6d4ab67b59236af4e63c"><td class="mdescLeft"> </td><td class="mdescRight">Obtain an awaitable object that refers to any event. It can be co_await-ed to wait for the next event. <a href="classdpp_1_1event__router__t.html#a2223cf644fac6d4ab67b59236af4e63c">More...</a><br /></td></tr>
<tr class="separator:a2223cf644fac6d4ab67b59236af4e63c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abab35ab0fc1efe0057b69ff7bbd485ab"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#abab35ab0fc1efe0057b69ff7bbd485ab">empty</a> () const</td></tr>
<tr class="memdesc:abab35ab0fc1efe0057b69ff7bbd485ab"><td class="mdescLeft"> </td><td class="mdescRight">Returns true if the container of listeners is empty, i.e. there is nothing listening for this event right now. <a href="classdpp_1_1event__router__t.html#abab35ab0fc1efe0057b69ff7bbd485ab">More...</a><br /></td></tr>
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<tr class="memitem:a98f8bb07280138a21bbdd2348912da5b"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a98f8bb07280138a21bbdd2348912da5b">operator bool</a> () const</td></tr>
<tr class="memdesc:a98f8bb07280138a21bbdd2348912da5b"><td class="mdescLeft"> </td><td class="mdescRight">Returns true if any listeners are attached. <a href="classdpp_1_1event__router__t.html#a98f8bb07280138a21bbdd2348912da5b">More...</a><br /></td></tr>
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<tr class="memitem:a1abf0dab2344fad5d1ce20d79c87dac0"><td class="memTemplParams" colspan="2">template<typename F > </td></tr>
<tr class="memitem:a1abf0dab2344fad5d1ce20d79c87dac0"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="namespacedpp.html#a4641626be7775de0b8b63a6e68d0934e">event_handle</a> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a1abf0dab2344fad5d1ce20d79c87dac0">operator()</a> (F &&fun)</td></tr>
<tr class="memdesc:a1abf0dab2344fad5d1ce20d79c87dac0"><td class="mdescLeft"> </td><td class="mdescRight">Attach a callable to the event, adding a listener. The callable should either be of the form <code>void(const T&)</code> or <code><a class="el" href="classdpp_1_1task.html" title="A coroutine task. It starts immediately on construction and can be co_await-ed, making it perfect for...">dpp::task</a><void>(const T&)</code> (the latter requires DPP_CORO to be defined), where T is the event type for this event router. <a href="classdpp_1_1event__router__t.html#a1abf0dab2344fad5d1ce20d79c87dac0">More...</a><br /></td></tr>
<tr class="separator:a1abf0dab2344fad5d1ce20d79c87dac0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a636ce010bc662fd3d8c93a538786fc07"><td class="memTemplParams" colspan="2">template<typename F > </td></tr>
<tr class="memitem:a636ce010bc662fd3d8c93a538786fc07"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="namespacedpp.html#a4641626be7775de0b8b63a6e68d0934e">event_handle</a> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a636ce010bc662fd3d8c93a538786fc07">attach</a> (F &&fun)</td></tr>
<tr class="memdesc:a636ce010bc662fd3d8c93a538786fc07"><td class="mdescLeft"> </td><td class="mdescRight">Attach a callable to the event, adding a listener. The callable should either be of the form <code>void(const T&)</code> or <code><a class="el" href="classdpp_1_1task.html" title="A coroutine task. It starts immediately on construction and can be co_await-ed, making it perfect for...">dpp::task</a><void>(const T&)</code> (the latter requires DPP_CORO to be defined), where T is the event type for this event router. <a href="classdpp_1_1event__router__t.html#a636ce010bc662fd3d8c93a538786fc07">More...</a><br /></td></tr>
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<tr class="memitem:a6cb1a37fce0778d18db0104b2e61b9f4"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a6cb1a37fce0778d18db0104b2e61b9f4">detach</a> (const <a class="el" href="namespacedpp.html#a4641626be7775de0b8b63a6e68d0934e">event_handle</a> &<a class="el" href="classdpp_1_1event__router__t.html#a493534366b5897f60f37c61b9faf454e">handle</a>)</td></tr>
<tr class="memdesc:a6cb1a37fce0778d18db0104b2e61b9f4"><td class="mdescLeft"> </td><td class="mdescRight">Detach a listener from the event using a previously obtained ID. <a href="classdpp_1_1event__router__t.html#a6cb1a37fce0778d18db0104b2e61b9f4">More...</a><br /></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pro-methods" name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr class="memitem:a5a344ce973c4428d889d11c5f35bea74"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a5a344ce973c4428d889d11c5f35bea74">set_warning_callback</a> (std::function< void(const T &)> warning_function)</td></tr>
<tr class="memdesc:a5a344ce973c4428d889d11c5f35bea74"><td class="mdescLeft"> </td><td class="mdescRight">Next handle to be given out by the event router. <a href="classdpp_1_1event__router__t.html#a5a344ce973c4428d889d11c5f35bea74">More...</a><br /></td></tr>
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<tr class="memitem:a493534366b5897f60f37c61b9faf454e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a493534366b5897f60f37c61b9faf454e">handle</a> (const T &event) const</td></tr>
<tr class="memdesc:a493534366b5897f60f37c61b9faf454e"><td class="mdescLeft"> </td><td class="mdescRight">Handle an event. This function should only be used without coro enabled, otherwise use handle_coro. <a href="classdpp_1_1event__router__t.html#a493534366b5897f60f37c61b9faf454e">More...</a><br /></td></tr>
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<tr class="memitem:a7870d7eac66020245fa0b35b12852147"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structdpp_1_1job.html">dpp::job</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a7870d7eac66020245fa0b35b12852147">handle_coro</a> (T event) const</td></tr>
<tr class="memdesc:a7870d7eac66020245fa0b35b12852147"><td class="mdescLeft"> </td><td class="mdescRight">Handle an event as a coroutine, ensuring the lifetime of the event object. <a href="classdpp_1_1event__router__t.html#a7870d7eac66020245fa0b35b12852147">More...</a><br /></td></tr>
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<tr class="memitem:ae83e7b537ef2c5a087e13257aac4e73d"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#ae83e7b537ef2c5a087e13257aac4e73d">attach_awaiter</a> (<a class="el" href="classdpp_1_1detail_1_1event__router_1_1awaitable.html">detail::event_router::awaitable</a>< T > *awaiter)</td></tr>
<tr class="memdesc:ae83e7b537ef2c5a087e13257aac4e73d"><td class="mdescLeft"> </td><td class="mdescRight">Attach a suspended coroutine to this event router via <a class="el" href="classdpp_1_1detail_1_1event__router_1_1awaitable.html" title="Awaitable object representing an event. A user can co_await on this object to resume the next time th...">detail::event_router::awaitable</a>. It will be resumed and detached when an event satisfying its condition completes, or it is cancelled. <a href="classdpp_1_1event__router__t.html#ae83e7b537ef2c5a087e13257aac4e73d">More...</a><br /></td></tr>
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<tr class="memitem:a11d4ed56a2b579428a26ae77ac418854"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a11d4ed56a2b579428a26ae77ac418854">detach_coro</a> (void *<a class="el" href="classdpp_1_1event__router__t.html#a493534366b5897f60f37c61b9faf454e">handle</a>)</td></tr>
<tr class="memdesc:a11d4ed56a2b579428a26ae77ac418854"><td class="mdescLeft"> </td><td class="mdescRight">Detach an awaiting coroutine handle from this event router. This is mostly called when a <a class="el" href="classdpp_1_1detail_1_1event__router_1_1awaitable.html" title="Awaitable object representing an event. A user can co_await on this object to resume the next time th...">detail::event_router::awaitable</a> is cancelled. <a href="classdpp_1_1event__router__t.html#a11d4ed56a2b579428a26ae77ac418854">More...</a><br /></td></tr>
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<tr class="memitem:a67fa825b406bca67e2f7972f1428c597"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a67fa825b406bca67e2f7972f1428c597">resume_awaiters</a> (const T &event) const</td></tr>
<tr class="memdesc:a67fa825b406bca67e2f7972f1428c597"><td class="mdescLeft"> </td><td class="mdescRight">Resume any awaiter whose predicate matches this event, or is null. <a href="classdpp_1_1event__router__t.html#a67fa825b406bca67e2f7972f1428c597">More...</a><br /></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="friends" name="friends"></a>
Friends</h2></td></tr>
<tr class="memitem:a93941955d9d15030232a5aaa08bb9afa"><td class="memItemLeft" align="right" valign="top">class </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a93941955d9d15030232a5aaa08bb9afa">cluster</a></td></tr>
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<tr class="memitem:a4e278a27ba250ce3f647b2a695c01335"><td class="memItemLeft" align="right" valign="top">class </td><td class="memItemRight" valign="bottom"><a class="el" href="classdpp_1_1event__router__t.html#a4e278a27ba250ce3f647b2a695c01335">detail::event_router::awaitable< T ></a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><div class="compoundTemplParams">template<class T><br />
class dpp::event_router_t< T ></div><p >Handles routing of an event to multiple listeners. Multiple listeners may attach to the <a class="el" href="classdpp_1_1event__router__t.html" title="Handles routing of an event to multiple listeners. Multiple listeners may attach to the event_router_...">event_router_t</a> by means of <a class="el" href="classdpp_1_1event__router__t.html#a1abf0dab2344fad5d1ce20d79c87dac0">operator()</a>. Passing a lambda into <a class="el" href="classdpp_1_1event__router__t.html#a1abf0dab2344fad5d1ce20d79c87dac0">operator()</a> attaches to the event. </p>
<p >Dispatchers of the event may call the <a class="el" href="classdpp_1_1event__router__t.html#a8099d8f317b52a9e9a2e5c6b248a73a3">call()</a> method to cause all listeners to receive the event.</p>
<p >The <a class="el" href="classdpp_1_1event__router__t.html#abab35ab0fc1efe0057b69ff7bbd485ab">empty()</a> method will return true if there are no listeners attached to the <a class="el" href="classdpp_1_1event__router__t.html" title="Handles routing of an event to multiple listeners. Multiple listeners may attach to the event_router_...">event_router_t</a> (this can be used to save time by not constructing objects that nobody will ever see).</p>
<p >The <a class="el" href="classdpp_1_1event__router__t.html#a6cb1a37fce0778d18db0104b2e61b9f4">detach()</a> method removes an existing listener from the event, using the event_handle ID returned by <a class="el" href="classdpp_1_1event__router__t.html#a1abf0dab2344fad5d1ce20d79c87dac0">operator()</a>.</p>
<p >This class is used by the library to route all websocket events to listening code.</p>
<p >Example:</p>
<div class="fragment"><div class="line"><span class="comment">// Declare an event that takes log_t as its parameter</span></div>
<div class="line">event_router_t<log_t> my_event;</div>
<div class="line"> </div>
<div class="line"><span class="comment">// Attach a listener to the event</span></div>
<div class="line"><a class="code hl_typedef" href="namespacedpp.html#a4641626be7775de0b8b63a6e68d0934e">event_handle</a> <span class="keywordtype">id</span> = my_event([&](<span class="keyword">const</span> log_t& cc) {</div>
<div class="line"> std::cout << cc.message << <span class="stringliteral">"\n"</span>;</div>
<div class="line">});</div>
<div class="line"> </div>
<div class="line"><span class="comment">// Construct a log_t and call the event (listeners will receive the log_t object)</span></div>
<div class="line">log_t lt;</div>
<div class="line">lt.message = <span class="stringliteral">"foo"</span>;</div>
<div class="line">my_event.call(lt);</div>
<div class="line"> </div>
<div class="line"><span class="comment">// Detach from an event using the handle returned by operator()</span></div>
<div class="line">my_event.detach(<span class="keywordtype">id</span>);</div>
<div class="ttc" id="anamespacedpp_html_a4641626be7775de0b8b63a6e68d0934e"><div class="ttname"><a href="namespacedpp.html#a4641626be7775de0b8b63a6e68d0934e">dpp::event_handle</a></div><div class="ttdeci">size_t event_handle</div><div class="ttdoc">A returned event handle for an event which was attached.</div><div class="ttdef"><b>Definition:</b> event_router.h:159</div></div>
</div><!-- fragment --><dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">T</td><td>type of single parameter passed to event lambda derived from <a class="el" href="structdpp_1_1event__dispatch__t.html" title="Base event parameter struct. Each event you receive from the library will have its parameter derived ...">event_dispatch_t</a> </td></tr>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
<a id="a5ead27e7e608a86b4622021fddb384c3" name="a5ead27e7e608a86b4622021fddb384c3"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5ead27e7e608a86b4622021fddb384c3">◆ </a></span>event_router_t()</h2>
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<td class="memname"><a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::<a class="el" href="classdpp_1_1event__router__t.html">event_router_t</a> </td>
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<p>Construct a new <a class="el" href="classdpp_1_1event__router__t.html" title="Handles routing of an event to multiple listeners. Multiple listeners may attach to the event_router_...">event_router_t</a> object. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a17b89d58a79e87083b060a9c0800a8c5">◆ </a></span>~event_router_t()</h2>
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<td class="memname"><a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::~<a class="el" href="classdpp_1_1event__router__t.html">event_router_t</a> </td>
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<p>Destructor. Will cancel any coroutine awaiting on events. </p>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">!</td><td>Cancelling a coroutine will throw a <a class="el" href="classdpp_1_1task__cancelled__exception.html" title="Represents the cancellation of a task. Will be thrown to the awaiter of a cancelled task.">dpp::task_cancelled_exception</a> to it. This will be caught in this destructor, however, make sure no other exceptions are thrown in the coroutine after that or it will terminate. </td></tr>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a636ce010bc662fd3d8c93a538786fc07">◆ </a></span>attach()</h2>
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<td class="memname"><a class="el" href="namespacedpp.html#a4641626be7775de0b8b63a6e68d0934e">event_handle</a> <a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::attach </td>
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<p>Attach a callable to the event, adding a listener. The callable should either be of the form <code>void(const T&)</code> or <code><a class="el" href="classdpp_1_1task.html" title="A coroutine task. It starts immediately on construction and can be co_await-ed, making it perfect for...">dpp::task</a><void>(const T&)</code> (the latter requires DPP_CORO to be defined), where T is the event type for this event router. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">fun</td><td>Callable to attach to event </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>event_handle An event handle unique to this event, used to detach the listener from the event later if necessary. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ae83e7b537ef2c5a087e13257aac4e73d">◆ </a></span>attach_awaiter()</h2>
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<td class="memname">void <a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::attach_awaiter </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classdpp_1_1detail_1_1event__router_1_1awaitable.html">detail::event_router::awaitable</a>< T > * </td>
<td class="paramname"><em>awaiter</em></td><td>)</td>
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<p>Attach a suspended coroutine to this event router via <a class="el" href="classdpp_1_1detail_1_1event__router_1_1awaitable.html" title="Awaitable object representing an event. A user can co_await on this object to resume the next time th...">detail::event_router::awaitable</a>. It will be resumed and detached when an event satisfying its condition completes, or it is cancelled. </p>
<p >This is for internal usage only, the user way to do this is to co_await it (which will call this when suspending) This guarantees that the coroutine is indeed suspended and thus can be resumed at any time</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">awaiter</td><td>Awaiter to attach </td></tr>
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</dd>
</dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a8099d8f317b52a9e9a2e5c6b248a73a3">◆ </a></span>call() <span class="overload">[1/2]</span></h2>
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<td class="memname">void <a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::call </td>
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<p>Call all attached listeners. Listeners may cancel, by calling the event.cancel method. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">event</td><td>Class to pass as parameter to all listeners. </td></tr>
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</dd>
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<h2 class="memtitle"><span class="permalink"><a href="#a36d1120fa6ea95b44bd34cdf8cdcf9d4">◆ </a></span>call() <span class="overload">[2/2]</span></h2>
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<td class="memname">void <a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::call </td>
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<p>Call all attached listeners. Listeners may cancel, by calling the event.cancel method. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">event</td><td>Class to pass as parameter to all listeners. </td></tr>
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</dd>
</dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a6cb1a37fce0778d18db0104b2e61b9f4">◆ </a></span>detach()</h2>
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<td class="memname">bool <a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::detach </td>
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<td class="paramtype">const <a class="el" href="namespacedpp.html#a4641626be7775de0b8b63a6e68d0934e">event_handle</a> & </td>
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<p>Detach a listener from the event using a previously obtained ID. </p>
<dl class="section warning"><dt>Warning</dt><dd>You cannot call this within an event handler.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">handle</td><td>An ID obtained from operator() </td></tr>
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<dl class="retval"><dt>Return values</dt><dd>
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<tr><td class="paramname">true</td><td>The event was successfully detached </td></tr>
<tr><td class="paramname">false</td><td>The ID is invalid (possibly already detached, or does not exist) </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a11d4ed56a2b579428a26ae77ac418854">◆ </a></span>detach_coro()</h2>
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<td class="memname">void <a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::detach_coro </td>
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<p>Detach an awaiting coroutine handle from this event router. This is mostly called when a <a class="el" href="classdpp_1_1detail_1_1event__router_1_1awaitable.html" title="Awaitable object representing an event. A user can co_await on this object to resume the next time th...">detail::event_router::awaitable</a> is cancelled. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">handle</td><td>Coroutine handle to find in the attached coroutines </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#abab35ab0fc1efe0057b69ff7bbd485ab">◆ </a></span>empty()</h2>
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<p>Returns true if the container of listeners is empty, i.e. there is nothing listening for this event right now. </p>
<dl class="retval"><dt>Return values</dt><dd>
<table class="retval">
<tr><td class="paramname">true</td><td>if there are no listeners </td></tr>
<tr><td class="paramname">false</td><td>if there are some listeners </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a493534366b5897f60f37c61b9faf454e">◆ </a></span>handle()</h2>
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<p>Handle an event. This function should only be used without coro enabled, otherwise use handle_coro. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a7870d7eac66020245fa0b35b12852147">◆ </a></span>handle_coro()</h2>
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<td class="memname"><a class="el" href="structdpp_1_1job.html">dpp::job</a> <a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::handle_coro </td>
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<p>Handle an event as a coroutine, ensuring the lifetime of the event object. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a98f8bb07280138a21bbdd2348912da5b">◆ </a></span>operator bool()</h2>
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<p>Returns true if any listeners are attached. </p>
<p >This is the boolean opposite of <a class="el" href="classdpp_1_1event__router__t.html#abab35ab0fc1efe0057b69ff7bbd485ab" title="Returns true if the container of listeners is empty, i.e. there is nothing listening for this event r...">event_router_t::empty()</a>. </p><dl class="retval"><dt>Return values</dt><dd>
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<tr><td class="paramname">true</td><td>if listeners are attached </td></tr>
<tr><td class="paramname">false</td><td>if no listeners are attached </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a2223cf644fac6d4ab67b59236af4e63c">◆ </a></span>operator co_await()</h2>
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<td class="memname">auto <a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::operator co_await </td>
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<p>Obtain an awaitable object that refers to any event. It can be co_await-ed to wait for the next event. </p>
<p >Example: </p><div class="fragment"><div class="line"><a class="code hl_class" href="classdpp_1_1task.html">dpp::task<></a> my_handler(<span class="keyword">const</span> <a class="code hl_struct" href="structdpp_1_1slashcommand__t.html">dpp::slashcommand_t</a>& event) {</div>
<div class="line"> <span class="keyword">co_await</span> <span class="keyword">event</span>.co_reply(<a class="code hl_struct" href="structdpp_1_1message.html">dpp::message</a>().add_component(<a class="code hl_class" href="classdpp_1_1component.html">dpp::component</a>().add_component().set_label(<span class="stringliteral">"click me!"</span>).set_id(<span class="stringliteral">"test"</span>)));</div>
<div class="line"> </div>
<div class="line"> <a class="code hl_struct" href="structdpp_1_1button__click__t.html">dpp::button_click_t</a> <a class="code hl_variable" href="namespacedpp_1_1unicode__emoji.html#a1121b729a73cc36fb0bf2b8e3d7dc979">b</a> = <span class="keyword">co_await</span> c->on_message_create;</div>
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<div class="line"> <span class="comment">// do something on button click</span></div>
<div class="line">}</div>
<div class="ttc" id="aclassdpp_1_1component_html"><div class="ttname"><a href="classdpp_1_1component.html">dpp::component</a></div><div class="ttdoc">Represents the component object. A component is a clickable button or drop down list within a discord...</div><div class="ttdef"><b>Definition:</b> message.h:348</div></div>
<div class="ttc" id="aclassdpp_1_1task_html"><div class="ttname"><a href="classdpp_1_1task.html">dpp::task</a></div><div class="ttdoc">A coroutine task. It starts immediately on construction and can be co_await-ed, making it perfect for...</div><div class="ttdef"><b>Definition:</b> task.h:95</div></div>
<div class="ttc" id="anamespacedpp_1_1unicode__emoji_html_a1121b729a73cc36fb0bf2b8e3d7dc979"><div class="ttname"><a href="namespacedpp_1_1unicode__emoji.html#a1121b729a73cc36fb0bf2b8e3d7dc979">dpp::unicode_emoji::b</a></div><div class="ttdeci">constexpr const char b[]</div><div class="ttdef"><b>Definition:</b> unicode_emoji.h:5255</div></div>
<div class="ttc" id="astructdpp_1_1button__click__t_html"><div class="ttname"><a href="structdpp_1_1button__click__t.html">dpp::button_click_t</a></div><div class="ttdoc">Click on button.</div><div class="ttdef"><b>Definition:</b> dispatcher.h:713</div></div>
<div class="ttc" id="astructdpp_1_1message_html"><div class="ttname"><a href="structdpp_1_1message.html">dpp::message</a></div><div class="ttdoc">Represents messages sent and received on Discord.</div><div class="ttdef"><b>Definition:</b> message.h:2071</div></div>
<div class="ttc" id="astructdpp_1_1slashcommand__t_html"><div class="ttname"><a href="structdpp_1_1slashcommand__t.html">dpp::slashcommand_t</a></div><div class="ttdoc">User has issued a slash command.</div><div class="ttdef"><b>Definition:</b> dispatcher.h:705</div></div>
</div><!-- fragment --><p >This can be combined with <a class="el" href="classdpp_1_1when__any.html" title="Experimental class to co_await on a bunch of awaitable objects, resuming when the first one completes...">dpp::when_any</a> and other awaitables, for example <a class="el" href="classdpp_1_1cluster.html#ab960df57796742a4013c7a492f782ed8" title="Get an awaitable to wait a certain amount of seconds. Use the co_await keyword on its return value to...">dpp::cluster::co_sleep</a> to create expiring buttons.</p>
<dl class="section warning"><dt>Warning</dt><dd>On resumption the awaiter will be given <b>a reference</b> to the event. This means that variable may become dangling at the next co_await, be careful and save it in a variable if you need to. </dd></dl>
<dl class="section return"><dt>Returns</dt><dd>awaitable An awaitable object that can be co_await-ed to await an event matching the condition. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a1abf0dab2344fad5d1ce20d79c87dac0">◆ </a></span>operator()()</h2>
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<td class="memname"><a class="el" href="namespacedpp.html#a4641626be7775de0b8b63a6e68d0934e">event_handle</a> <a class="el" href="classdpp_1_1event__router__t.html">dpp::event_router_t</a>< T >::operator() </td>
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<p>Attach a callable to the event, adding a listener. The callable should either be of the form <code>void(const T&)</code> or <code><a class="el" href="classdpp_1_1task.html" title="A coroutine task. It starts immediately on construction and can be co_await-ed, making it perfect for...">dpp::task</a><void>(const T&)</code> (the latter requires DPP_CORO to be defined), where T is the event type for this event router. </p>
<p >This has the exact same behavior as using <a class="el" href="classdpp_1_1event__router__t.html#a636ce010bc662fd3d8c93a538786fc07">attach</a>.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="classdpp_1_1event__router__t.html#a636ce010bc662fd3d8c93a538786fc07" title="Attach a callable to the event, adding a listener. The callable should either be of the form void(con...">attach</a> </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">fun</td><td>Callable to attach to event </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>event_handle An event handle unique to this event, used to detach the listener from the event later if necessary. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a67fa825b406bca67e2f7972f1428c597">◆ </a></span>resume_awaiters()</h2>
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<p>Resume any awaiter whose predicate matches this event, or is null. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">event</td><td>Event to compare and pass to accepting awaiters </td></tr>
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<p >If state == none (was never awaited), do nothing If state == waiting, prevent resumption, resume on our end If state == resuming || cancelling, ignore</p>
<p >Technically only cancelling || waiting should be possible here We do this by trying to exchange "waiting" with "resuming". If that returns false, this is presumed to be "cancelling"</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a5a344ce973c4428d889d11c5f35bea74">◆ </a></span>set_warning_callback()</h2>
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<p>Next handle to be given out by the event router. </p>
<p >Set the warning callback object used to check that this event is capable of running properly</p>
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<tr><td class="paramname">warning_function</td><td>A checking function to call </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a16c2527f66c8b74e5c0678ace4fa549e">◆ </a></span>when()</h2>
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<p>Obtain an awaitable object that refers to an event with a certain condition. It can be co_await-ed to wait for the next event that satisfies this condition. On resumption the awaiter will be given <b>a reference</b> to the event, saving it in a variable is recommended to avoid variable lifetime issues. </p>
<p >Example: </p><div class="fragment"><div class="line"><a class="code hl_class" href="classdpp_1_1task.html">dpp::task<></a> my_handler(<span class="keyword">const</span> <a class="code hl_struct" href="structdpp_1_1slashcommand__t.html">dpp::slashcommand_t</a>& event) {</div>
<div class="line"> <span class="keyword">co_await</span> <span class="keyword">event</span>.co_reply(<a class="code hl_struct" href="structdpp_1_1message.html">dpp::message</a>().add_component(<a class="code hl_class" href="classdpp_1_1component.html">dpp::component</a>().add_component().set_label(<span class="stringliteral">"click me!"</span>).set_id(<span class="stringliteral">"test"</span>)));</div>
<div class="line"> </div>
<div class="line"> <a class="code hl_struct" href="structdpp_1_1button__click__t.html">dpp::button_click_t</a> <a class="code hl_variable" href="namespacedpp_1_1unicode__emoji.html#a1121b729a73cc36fb0bf2b8e3d7dc979">b</a> = <span class="keyword">co_await</span> c->on_button_click.with([](<span class="keyword">const</span> <a class="code hl_struct" href="structdpp_1_1button__click__t.html">dpp::button_click_t</a> &event){ <span class="keywordflow">return</span> <span class="keyword">event</span>.custom_id == <span class="stringliteral">"test"</span>; });</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// do something on button click</span></div>
<div class="line">}</div>
</div><!-- fragment --><p >This can be combined with <a class="el" href="classdpp_1_1when__any.html" title="Experimental class to co_await on a bunch of awaitable objects, resuming when the first one completes...">dpp::when_any</a> and other awaitables, for example <a class="el" href="classdpp_1_1cluster.html#ab960df57796742a4013c7a492f782ed8" title="Get an awaitable to wait a certain amount of seconds. Use the co_await keyword on its return value to...">dpp::cluster::co_sleep</a> to create <a class="el" href="expiring-buttons.html">expiring buttons</a>.</p>
<dl class="section warning"><dt>Warning</dt><dd>On resumption the awaiter will be given <b>a reference</b> to the event. This means that variable may become dangling at the next co_await, be careful and save it in a variable if you need to. </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pred</td><td>Predicate to check the event against. This should be a callable of the form <code>bool(const T&)</code> where T is the event type, returning true if the event is to match. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>awaitable An awaitable object that can be co_await-ed to await an event matching the condition. </dd></dl>
</div>
</div>
<h2 class="groupheader">Friends And Related Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a93941955d9d15030232a5aaa08bb9afa">◆ </a></span>cluster</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a4e278a27ba250ce3f647b2a695c01335">◆ </a></span>detail::event_router::awaitable< T ></h2>
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