Part one - removed references and smart pointers
This commit is contained in:
@ -1,119 +1,119 @@
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// Copyright (c) 2022 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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struct IEventListener {
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/**
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* Abstracted method for C++ template reasons. Invokes the listener.
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*
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* @param args Arguments to pass to the listener.
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*/
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virtual void invoke(A... args) = 0;
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};
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template <class T, typename... A>
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struct EventListener : public IEventListener<A...> {
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T *instance;
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void (T::*callback)(A... args);
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/**
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* Construct a new event listener structure.
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*
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* @param instance Instance that the callback belongs to.
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* @param callback Callback method that invokes back.
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*/
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EventListener(T *instance, void (T::*callback)(A... args)) :
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instance(instance),
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callback(callback)
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{
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}
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void invoke(A... args) {
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((*this->instance).*(this->callback))(args...);
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}
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};
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template<typename...A>
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class Event {
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private:
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std::vector<IEventListener<A...>*> listeners;
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public:
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/**
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* Add a listener to this event.
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*
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* @tparam T The class that will receive the event.
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* @param instance Instance of type T that will receive the callback.
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* @param callback Callback method attached to T to receive the event.
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* @return The initialized event listener. You don't really need this.
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*/
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template<class T>
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EventListener<T, A...> * addListener(
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T *instance,
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void (T::*callback)(A... args)
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) {
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auto listener = new EventListener<T,A...>(instance, callback);
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this->listeners.push_back(listener);
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return listener;
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}
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/**
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* Removes an event listener from this event.
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*
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* @tparam T The class that was once receiving the event.
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* @param instance Instance of type T that did receive the callback.
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* @param callback Callback method attached to T for the event.
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*/
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template<class T>
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void removeListener(
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T *instance,
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void (T::*callback)(A... args)
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) {
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auto it = this->listeners.begin();
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while(it != this->listeners.end()) {
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auto listener = static_cast<EventListener<T,A...>*>(*it);
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if(listener->instance != instance || listener->callback != callback) {
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++it;
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continue;
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}
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this->listeners.erase(it);
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delete listener;
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break;
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}
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}
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/**
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* Invokes the event and emits to all of the listeners.
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*
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* @param args Arguments for this event to pass to the listeners.
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*/
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void invoke(A... args) {
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auto it = this->listeners.begin();
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while(it != this->listeners.end()) {
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(*it)->invoke(args...);
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++it;
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}
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}
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/**
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* Disposes the event instance. Will also destroy all of the event
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* listeners.
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*/
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~Event() {
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auto it = this->listeners.begin();
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while(it != this->listeners.end()) {
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delete *it;
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++it;
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}
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}
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};
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// Copyright (c) 2022 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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#include "assert/assert.hpp"
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namespace Dawn {
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template<typename... A>
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struct IEventListener {
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/**
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* Abstracted method for C++ template reasons. Invokes the listener.
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*
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* @param args Arguments to pass to the listener.
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*/
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virtual void invoke(A... args) = 0;
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};
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template <class T, typename... A>
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struct EventListener : public IEventListener<A...> {
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T *instance;
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void (T::*callback)(A... args);
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/**
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* Construct a new event listener structure.
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*
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* @param instance Instance that the callback belongs to.
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* @param callback Callback method that invokes back.
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*/
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EventListener(T *instance, void (T::*callback)(A... args)) {
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this->instance = instance;
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this->callback = callback;
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}
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void invoke(A... args) {
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((*this->instance).*(this->callback))(args...);
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}
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};
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template<typename...A>
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class Event {
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private:
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std::vector<IEventListener<A...>*> listeners;
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public:
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/**
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* Add a listener to this event.
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*
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* @tparam T The class that will receive the event.
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* @param instance Instance of type T that will receive the callback.
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* @param callback Callback method attached to T to receive the event.
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* @return The initialized event listener. You don't really need this.
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*/
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template<class T>
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EventListener<T, A...> * addListener(
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T *instance,
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void (T::*callback)(A... args)
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) {
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auto listener = new EventListener<T,A...>(instance, callback);
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this->listeners.push_back(listener);
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return listener;
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}
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/**
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* Removes an event listener from this event.
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*
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* @tparam T The class that was once receiving the event.
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* @param instance Instance of type T that did receive the callback.
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* @param callback Callback method attached to T for the event.
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*/
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template<class T>
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void removeListener(
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T *instance,
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void (T::*callback)(A... args)
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) {
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auto it = this->listeners.begin();
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while(it != this->listeners.end()) {
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auto listener = static_cast<EventListener<T,A...>*>(*it);
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if(listener->instance != instance || listener->callback != callback) {
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++it;
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continue;
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}
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this->listeners.erase(it);
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delete listener;
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break;
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}
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}
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/**
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* Invokes the event and emits to all of the listeners.
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*
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* @param args Arguments for this event to pass to the listeners.
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*/
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void invoke(A... args) {
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auto it = this->listeners.begin();
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while(it != this->listeners.end()) {
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(*it)->invoke(args...);
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++it;
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}
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}
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/**
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* Disposes the event instance. Will also destroy all of the event
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* listeners.
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*/
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~Event() {
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auto it = this->listeners.begin();
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while(it != this->listeners.end()) {
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delete *it;
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++it;
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}
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}
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};
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}
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