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<div><div class="header">
<div class="headertitle"><div class="title">Waiting for events </div></div>
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<div class="textblock"><p ><dl class="section warning"><dt>Warning</dt><dd>D++ Coroutines are a very new feature and are currently only supported by D++ on g++ 13, clang/LLVM 14, and MSVC 19.37 or above. Additionally, D++ must be built with the CMake option DPP_CORO, and your program must both define the macro DPP_CORO and use C++20 or above. </dd></dl>
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<p >D++ makes it possible to await events: simple use <code>co_await</code> on any of the event routers, such as <a class="el" href="classdpp_1_1cluster.html#a1a632b3c2c8d3ff3a47372ffa770acf5">on_message_create</a>, and your coroutine will be suspended until the next event fired by this event router. You can also <code>co_await</code> the return of an event router's <a class="el" href="classdpp_1_1event__router__t.html#a16c2527f66c8b74e5c0678ace4fa549e">when()</a> method while passing it a predicate function object, it will only resume your coroutine when the predicate returns true. Be aware that your coroutine is attached to the event router only when you call <code>co_await</code> and not before, and will be detached as it is resumed.</p>
<dl class="section note"><dt>Note</dt><dd>When the event router resumes your coroutine, it will give you <b>a reference to the event object</b>. This will likely mean it will be destroyed after your next co_await, make sure to save it in a local variable if you need it for longer.</dd></dl>
<div class="fragment"><div class="line"><span class="preprocessor">#include <dpp/dpp.h></span></div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main() {</div>
<div class="line"> <a class="code hl_class" href="classdpp_1_1cluster.html">dpp::cluster</a> bot{<span class="stringliteral">"token"</span>};</div>
<div class="line"> </div>
<div class="line"> bot.<a class="code hl_variable" href="classdpp_1_1cluster.html#ab840686c7cd2e15f4a66ab64f62e106b">on_log</a>(<a class="code hl_function" href="namespacedpp_1_1utility.html#a8c2cc04bb80ffd287b376d5977899277">dpp::utility::cout_logger</a>());</div>
<div class="line"> </div>
<div class="line"> bot.on_slashcommand([](<span class="keyword">const</span> <a class="code hl_struct" href="structdpp_1_1slashcommand__t.html">dpp::slashcommand_t</a>& event) -> <a class="code hl_class" href="classdpp_1_1task.html">dpp::task<void></a> {</div>
<div class="line"> <span class="keywordflow">if</span> (event.<a class="code hl_variable" href="structdpp_1_1interaction__create__t.html#a8b0c69c156a1e532507a918c13414f14">command</a>.<a class="code hl_function" href="classdpp_1_1interaction.html#aabbb8d58d708128098516ed443d5c140">get_command_name</a>() == <span class="stringliteral">"test"</span>) {</div>
<div class="line"> <span class="comment">// Make a message and add a button with its custom ID set to the command interaction's ID so we can identify it</span></div>
<div class="line"> dpp::message m{<span class="stringliteral">"Test"</span>};</div>
<div class="line"> std::string <span class="keywordtype">id</span>{event.command.id.str()};</div>
<div class="line"> <a class="code hl_variable" href="namespacedpp_1_1unicode__emoji.html#a24ac871c89f4e1779cfeda23077faeac">m</a>.add_component(</div>
<div class="line"> <a class="code hl_class" href="classdpp_1_1component.html">dpp::component</a>{}.<a class="code hl_function" href="classdpp_1_1component.html#a3707437be16cc7dfd5edcf321f8e842d">add_component</a>(</div>
<div class="line"> <a class="code hl_class" href="classdpp_1_1component.html">dpp::component</a>{}</div>
<div class="line"> .<a class="code hl_function" href="classdpp_1_1component.html#a281e39d6b8c65b1fd301d195a835e703">set_type</a>(<a class="code hl_enumvalue" href="namespacedpp.html#afce43206033521b990e3a72bb87481b7a98228836af5d0c180cfc05eb1f0bfde9">dpp::cot_button</a>)</div>
<div class="line"> .<a class="code hl_function" href="classdpp_1_1component.html#a33f254b5ac5a043870cb30efc99fb580">set_label</a>(<span class="stringliteral">"Click me!"</span>)</div>
<div class="line"> .<a class="code hl_function" href="classdpp_1_1component.html#a5b5e20746e11d017569ccc46efd56688">set_id</a>(<span class="keywordtype">id</span>)</div>
<div class="line"> )</div>
<div class="line"> );</div>
<div class="line"> <span class="keyword">co_await</span> event.<a class="code hl_function" href="structdpp_1_1interaction__create__t.html#aef38626cd24d2212b00ab866509b4d59">co_reply</a>(m);</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> click_event = <span class="keyword">co_await</span> event.<a class="code hl_variable" href="structdpp_1_1event__dispatch__t.html#a8a87dcb222d9e2444a50b4df5caa28d4">owner</a>-><a class="code hl_variable" href="classdpp_1_1cluster.html#af9409347218d270da0aeb22b0a27c38d">on_button_click</a>.when(</div>
<div class="line"> <span class="comment">// Note!! Due to a bug in g++11 and g++12, id must be captured as a reference here or the compiler will destroy it twice. This is fixed in g++13</span></div>
<div class="line"> [&<span class="keywordtype">id</span>] (<a class="code hl_struct" href="structdpp_1_1button__click__t.html">dpp::button_click_t</a> <span class="keyword">const</span> &b) {</div>
<div class="line"> return b.custom_id == id;</div>
<div class="line"> }</div>
<div class="line"> );</div>
<div class="line"> <span class="comment">// Acknowledge the click and edit the original response, removing the button</span></div>
<div class="line"> click_event.reply();</div>
<div class="line"> event.<a class="code hl_function" href="structdpp_1_1interaction__create__t.html#a10553ebb8d10ba58595f825e0a89eb1b">edit_original_response</a>(<a class="code hl_struct" href="structdpp_1_1message.html">dpp::message</a>{<span class="stringliteral">"You clicked the button!"</span>});</div>
<div class="line"> }</div>
<div class="line"> });</div>
<div class="line"> </div>
<div class="line"> bot.on_ready([&bot](<span class="keyword">const</span> <a class="code hl_struct" href="structdpp_1_1ready__t.html">dpp::ready_t</a>& event) {</div>
<div class="line"> <span class="keywordflow">if</span> (dpp::run_once<struct register_bot_commands>()) {</div>
<div class="line"> <a class="code hl_class" href="classdpp_1_1slashcommand.html">dpp::slashcommand</a> command{<span class="stringliteral">"test"</span>, <span class="stringliteral">"Test awaiting for an event"</span>, bot.me.<a class="code hl_variable" href="classdpp_1_1managed.html#a40bf0c6cc03909910512808fa6caa112">id</a>};</div>
<div class="line"> </div>
<div class="line"> bot.global_command_create(command);</div>
<div class="line"> }</div>
<div class="line"> });</div>
<div class="line"> </div>
<div class="line"> bot.start(<a class="code hl_enumvalue" href="namespacedpp.html#af447e04d0490cd4a9de085e4a758faa4a155f7db65696b4c09b5fcc41787e4726">dpp::st_wait</a>);</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="ttc" id="aclassdpp_1_1cluster_html"><div class="ttname"><a href="classdpp_1_1cluster.html">dpp::cluster</a></div><div class="ttdoc">The cluster class represents a group of shards and a command queue for sending and receiving commands...</div><div class="ttdef"><b>Definition:</b> cluster.h:89</div></div>
<div class="ttc" id="aclassdpp_1_1cluster_html_ab840686c7cd2e15f4a66ab64f62e106b"><div class="ttname"><a href="classdpp_1_1cluster.html#ab840686c7cd2e15f4a66ab64f62e106b">dpp::cluster::on_log</a></div><div class="ttdeci">event_router_t< log_t > on_log</div><div class="ttdoc">Called when a log message is to be written to the log. You can attach any logging system here you wis...</div><div class="ttdef"><b>Definition:</b> cluster.h:657</div></div>
<div class="ttc" id="aclassdpp_1_1cluster_html_af9409347218d270da0aeb22b0a27c38d"><div class="ttname"><a href="classdpp_1_1cluster.html#af9409347218d270da0aeb22b0a27c38d">dpp::cluster::on_button_click</a></div><div class="ttdeci">event_router_t< button_click_t > on_button_click</div><div class="ttdoc">Called when a button is clicked attached to a message. Button clicks are triggered by discord when bu...</div><div class="ttdef"><b>Definition:</b> cluster.h:701</div></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_1component_html_a281e39d6b8c65b1fd301d195a835e703"><div class="ttname"><a href="classdpp_1_1component.html#a281e39d6b8c65b1fd301d195a835e703">dpp::component::set_type</a></div><div class="ttdeci">component & set_type(component_type ct)</div><div class="ttdoc">Set the type of the component. Button components (type dpp::cot_button) should always be contained wi...</div></div>
<div class="ttc" id="aclassdpp_1_1component_html_a33f254b5ac5a043870cb30efc99fb580"><div class="ttname"><a href="classdpp_1_1component.html#a33f254b5ac5a043870cb30efc99fb580">dpp::component::set_label</a></div><div class="ttdeci">component & set_label(std::string_view label)</div><div class="ttdoc">Set the label of the component, e.g. button text. For action rows, this field is ignored....</div></div>
<div class="ttc" id="aclassdpp_1_1component_html_a3707437be16cc7dfd5edcf321f8e842d"><div class="ttname"><a href="classdpp_1_1component.html#a3707437be16cc7dfd5edcf321f8e842d">dpp::component::add_component</a></div><div class="ttdeci">component & add_component(const component &c)</div><div class="ttdoc">Add a sub-component, only valid for action rows. Adding subcomponents to a component will automatical...</div></div>
<div class="ttc" id="aclassdpp_1_1component_html_a5b5e20746e11d017569ccc46efd56688"><div class="ttname"><a href="classdpp_1_1component.html#a5b5e20746e11d017569ccc46efd56688">dpp::component::set_id</a></div><div class="ttdeci">component & set_id(std::string_view id)</div><div class="ttdoc">Set the id of the component. For action rows, this field is ignored. Setting the id will auto-set the...</div></div>
<div class="ttc" id="aclassdpp_1_1interaction_html_aabbb8d58d708128098516ed443d5c140"><div class="ttname"><a href="classdpp_1_1interaction.html#aabbb8d58d708128098516ed443d5c140">dpp::interaction::get_command_name</a></div><div class="ttdeci">std::string get_command_name() const</div><div class="ttdoc">Get the command name for a command interaction.</div></div>
<div class="ttc" id="aclassdpp_1_1managed_html_a40bf0c6cc03909910512808fa6caa112"><div class="ttname"><a href="classdpp_1_1managed.html#a40bf0c6cc03909910512808fa6caa112">dpp::managed::id</a></div><div class="ttdeci">snowflake id</div><div class="ttdoc">Unique ID of object set by Discord. This value contains a timestamp, worker ID, internal server ID,...</div><div class="ttdef"><b>Definition:</b> managed.h:39</div></div>
<div class="ttc" id="aclassdpp_1_1slashcommand_html"><div class="ttname"><a href="classdpp_1_1slashcommand.html">dpp::slashcommand</a></div><div class="ttdoc">Represents an application command, created by your bot either globally, or on a guild.</div><div class="ttdef"><b>Definition:</b> appcommand.h:1397</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_a24ac871c89f4e1779cfeda23077faeac"><div class="ttname"><a href="namespacedpp_1_1unicode__emoji.html#a24ac871c89f4e1779cfeda23077faeac">dpp::unicode_emoji::m</a></div><div class="ttdeci">constexpr const char m[]</div><div class="ttdef"><b>Definition:</b> unicode_emoji.h:5304</div></div>
<div class="ttc" id="anamespacedpp_1_1utility_html_a8c2cc04bb80ffd287b376d5977899277"><div class="ttname"><a href="namespacedpp_1_1utility.html#a8c2cc04bb80ffd287b376d5977899277">dpp::utility::cout_logger</a></div><div class="ttdeci">std::function< void(const dpp::log_t &)> DPP_EXPORT cout_logger()</div><div class="ttdoc">Get a default logger that outputs to std::cout. e.g.</div></div>
<div class="ttc" id="anamespacedpp_html_af447e04d0490cd4a9de085e4a758faa4a155f7db65696b4c09b5fcc41787e4726"><div class="ttname"><a href="namespacedpp.html#af447e04d0490cd4a9de085e4a758faa4a155f7db65696b4c09b5fcc41787e4726">dpp::st_wait</a></div><div class="ttdeci">@ st_wait</div><div class="ttdoc">Wait forever on a condition variable. The cluster will spawn threads for each shard and start() will ...</div><div class="ttdef"><b>Definition:</b> cluster.h:72</div></div>
<div class="ttc" id="anamespacedpp_html_afce43206033521b990e3a72bb87481b7a98228836af5d0c180cfc05eb1f0bfde9"><div class="ttname"><a href="namespacedpp.html#afce43206033521b990e3a72bb87481b7a98228836af5d0c180cfc05eb1f0bfde9">dpp::cot_button</a></div><div class="ttdeci">@ cot_button</div><div class="ttdoc">Clickable button.</div><div class="ttdef"><b>Definition:</b> message.h:48</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_1event__dispatch__t_html_a8a87dcb222d9e2444a50b4df5caa28d4"><div class="ttname"><a href="structdpp_1_1event__dispatch__t.html#a8a87dcb222d9e2444a50b4df5caa28d4">dpp::event_dispatch_t::owner</a></div><div class="ttdeci">dpp::cluster * owner</div><div class="ttdoc">Cluster owning the event dispatch.</div><div class="ttdef"><b>Definition:</b> dispatcher.h:94</div></div>
<div class="ttc" id="astructdpp_1_1interaction__create__t_html_a10553ebb8d10ba58595f825e0a89eb1b"><div class="ttname"><a href="structdpp_1_1interaction__create__t.html#a10553ebb8d10ba58595f825e0a89eb1b">dpp::interaction_create_t::edit_original_response</a></div><div class="ttdeci">void edit_original_response(const message &m, command_completion_event_t callback=utility::log_error()) const</div><div class="ttdoc">Edit original response message for this interaction.</div></div>
<div class="ttc" id="astructdpp_1_1interaction__create__t_html_a8b0c69c156a1e532507a918c13414f14"><div class="ttname"><a href="structdpp_1_1interaction__create__t.html#a8b0c69c156a1e532507a918c13414f14">dpp::interaction_create_t::command</a></div><div class="ttdeci">interaction command</div><div class="ttdoc">command interaction</div><div class="ttdef"><b>Definition:</b> dispatcher.h:688</div></div>
<div class="ttc" id="astructdpp_1_1interaction__create__t_html_aef38626cd24d2212b00ab866509b4d59"><div class="ttname"><a href="structdpp_1_1interaction__create__t.html#aef38626cd24d2212b00ab866509b4d59">dpp::interaction_create_t::co_reply</a></div><div class="ttdeci">dpp::async< dpp::confirmation_callback_t > co_reply() const</div><div class="ttdoc">Acknowledge interaction without displaying a message to the user, for use with button and select menu...</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_1ready__t_html"><div class="ttname"><a href="structdpp_1_1ready__t.html">dpp::ready_t</a></div><div class="ttdoc">Session ready.</div><div class="ttdef"><b>Definition:</b> dispatcher.h:971</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>
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