Signal

template <typename... Args>
class Signal

using ConnectionID = size_t;

using SlotFunction = std::function<void(Args...)>;

ConnectionID connect(SlotFunction slot)

Signal<int, std::string> mySignal;

auto id = mySignal.connect([](int value, const std::string& text) {
    std::cout << "Received: " << value << ", " << text << std::endl;
});

void emit(Args... args) const

mySignal.emit(42, "Hello"); // Calls all connected functions

void disconnect(ConnectionID id)

auto id = mySignal.connect(callback);
mySignal.disconnect(id);  // Remove the connection

Signal<int, std::string> mySignal;

auto id = mySignal.connect([](int value, const std::string& text) {
    std::cout << "Received: " << value << ", " << text << std::endl;
});

mySignal.emit(42, "Hello"); // Calls the connected function
mySignal.disconnect(id);    // Remove the connection

class Button {
public:
    Signal<> onClick;  // No arguments
    
    void handleClick() {
        onClick.emit();
    }
};

Button button;
button.onClick.connect([]() {
    std::cout << "Button clicked!" << std::endl;
});

Signal<int> valueChanged;

auto id1 = valueChanged.connect([](int value) {
    std::cout << "Handler 1: " << value << std::endl;
});

auto id2 = valueChanged.connect([](int value) {
    std::cout << "Handler 2: " << value << std::endl;
});

valueChanged.emit(100);  // Calls both handlers
valueChanged.disconnect(id1);  // Remove first handler
valueChanged.emit(200);  // Only calls second handler

struct MouseEvent {
    int x, y;
    bool leftButton;
};

Signal<MouseEvent> onMouseClick;

onMouseClick.connect([](MouseEvent event) {
    std::cout << "Clicked at (" << event.x << ", " << event.y << ")" << std::endl;
});

onMouseClick.emit({100, 50, true});

button->onClick.connect([]() {
    std::cout << "Button clicked!" << std::endl;
});

slider->onValueChanged.connect([](float value) {
    std::cout << "New value: " << value << std::endl;
});

textInput->onTextChanged.connect([](const std::string& text) {
    std::cout << "Text changed to: " << text << std::endl;
});