_     _                           _   
 _| |_ _| |_ _ _ ___ ___ _ _ ___ ___| |_ 
| . | | | . | | |___| -_| | | -_|   |  _|
|___|___|___|___|   |___|\_/|___|_|_|_|  

C++ Event Library

Features

• Emit Events of any type
• Subscribe to Events of any type
• Manage subscription lifetime using scoped Tokens

Examples

Event Emitter

#include <iostream>

#include <dubu_event/dubu_event.h>

struct ResizeEvent {
    int width;
    int height;
};

class Window : public dubu::event::EventEmitter {
public:
    void Update() { Emit(ResizeEvent{.width = 800, .height = 600}); }
};

int main() {
    Window window;

    {
        auto token =
            window.RegisterListener<ResizeEvent>([](const ResizeEvent& e) {
                std::cout << "Window Resized: (" << e.width << ", " << e.height
                          << ")" << std::endl;
            });

        window.Update();  // This call will trigger the callback
    }

    window.Update();  // This call won't trigger the callback because the token
                      // has gone out of scope
}

Event Subscriber

#include <iostream>

#include <dubu_event/dubu_event.h>

struct CustomEvent {};

struct Foo : public dubu::event::EventEmitter {
    void DoSomething() { Emit<CustomEvent>(); }
};

struct Bar : public dubu::event::EventSubscriber {
    Bar(Foo& foo) {
        Subscribe<CustomEvent>([&](const auto&) { ++counter; }, foo);
    }

    int counter = 0;
};

int main() {
    Foo foo;
    Bar bar(foo);

    std::cout << bar.counter;  // 0

    foo.DoSomething();

    std::cout << bar.counter;  // 1
}