What is the signal-slot mechanism in C++?

What is the signal-slot mechanism in C++?

The signal-slot mechanism is a design pattern used in C++ for communication between objects. It allows one object to send a signal that another object can listen for and respond to.

How does it work in practice?

In practice, you define signals in one class and slots in another. When a signal is emitted, the connected slots are called automatically.

Can you give me a code example?

Sure! Here's a simple example:

class Button {
    Q_OBJECT
public:
    void click() {
        emit clicked();
    }
signals:
    void clicked();
};

class Window {
public:
    void onButtonClicked() {
        // Handle button click
    }
};

Button button;
Window window;
QObject::connect(&button, &Button::clicked, &window, &Window::onButtonClicked);

What are the advantages of using this mechanism?

The advantages include loose coupling between components, easier maintenance, and improved code readability.