56 lines
1.2 KiB
C++
56 lines
1.2 KiB
C++
// Copyright (c) 2023 Dominic Masters
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//
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// This software is released under the MIT License.
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// https://opensource.org/licenses/MIT
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#pragma once
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#include "dawnlibs.hpp"
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namespace Dawn {
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template<typename ...A>
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class Event {
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private:
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int32_t nextId = 0;
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std::map<int32_t, std::function<void(A...)>> listeners;
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public:
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/**
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* Constructs a new Event.
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*/
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Event() {
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}
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/**
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* Emits the event.
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* @param args The arguments to pass to the listeners.
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*/
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void emit(A ...args) {
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auto copy = listeners;
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for(auto &pair : copy) {
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pair.second(args...);
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}
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}
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/**
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* Listens to the event.
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* @param listener The listener to add.
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* @returns A function that can be called to remove the listener.
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*/
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std::function<void()> listen(const std::function<void(A...)> listener) {
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int32_t id = nextId++;
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listeners[id] = listener;
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return [this, id]() {
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listeners.erase(id);
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};
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}
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/**
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* Removes a listener from the event.
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* @param id The id of the listener to remove.
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*/
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virtual ~Event() {
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listeners.clear();
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}
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};
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} |