What Are Signals and Slots in Qt?

Signals and slots are two of the most common mechanisms used in Qt to communicate between objects. Signals are emitted when an event occurs, and slots are listened for and invoked when a signal is received.

A signal can be emitted by any object, and a slot can be registered to receive signals from any object. When an object emits a signal, it notifies all objects that have registered to listen for that particular signal. Slots can be registered with any object, or even with the QObject itself.

When a QObject receives a signal, it checks to see if the slot is registered to receive that particular signal. If the slot is registered, the QObject invokes the slot’s implementation.

Signals and slots provide an easy way for objects to communicate with one another. They allow you to create reusable components that can respond to events without having to code all of the logic yourself.

In addition, they make it easy to create user interfaces that are responsive to user input.

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