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56 lines
1.9 KiB
Markdown
56 lines
1.9 KiB
Markdown
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\page collecting-reactions Collecting Reactions
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D++ comes with many useful helper classes, but amongst these is something called dpp::collector. Collector is a template which can be specialised to automatically collect objects of a pre-determined type from events for a specific interval of time. Once this time period is up, or the class is otherwise signalled, a method is called with the complete set of collected objects.
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In the example below we will use it to collect all reactions on a message.
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~~~~~~~~~~{.cpp}
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#include <dpp/dpp.h>
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/* To create a collector we must derive from dpp::collector. As dpp::collector is a complicated template,
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* various pre-made forms exist such as this one, reaction_collector.
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*/
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class react_collector : public dpp::reaction_collector {
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public:
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/* Collector will run for 20 seconds */
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react_collector(dpp::cluster* cl, snowflake id) : dpp::message_collector(cl, 20, id) { }
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/* On completion just output number of collected reactions to as a message. */
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virtual void completed(const std::vector<dpp::collected_reaction>& list) {
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if (list.size()) {
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owner->message_create(dpp::message(list[0].channel_id, "I collected " + std::to_string(list.size()) + " reactions!"));
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} else {
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owner->message_create(dpp::message("... I got nothin'."));
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}
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}
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};
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int main() {
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/* Create bot */
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dpp::cluster bot("token", dpp::i_default_intents | dpp::i_message_content);
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/* Pointer to reaction collector */
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react_collector* r = nullptr;
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bot.on_log(dpp::utility::cout_logger());
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/* Message handler */
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bot.on_message_create([&](const dpp::message_create_t &event) {
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/* If someone sends a message that has the text 'collect reactions!' start a reaction collector */
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if (event.msg.content == "collect reactions!" && r == nullptr) {
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/* Create a new reaction collector to collect reactions */
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r = new react_collector(&bot, event.msg.id);
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}
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});
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/* Start bot */
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bot.start(dpp::st_wait);
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return 0;
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}
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~~~~~~~~~~
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