What are the differences between signals and callbacks in programming?

What are the differences between signals and callbacks in programming?

Signals and callbacks are both mechanisms for handling events, but they differ in implementation and usage. Callbacks are functions passed as arguments to other functions, while signals are more like notifications that can be emitted by objects.

Can you give me an example of each?

Sure! A callback example is a function that runs after a data fetch completes. A signal example is in Qt, where an object emits a signal when an event occurs, and other objects can connect to that signal.

Which one is better to use?

It depends on the context. Callbacks are simpler and more straightforward, while signals offer more flexibility and decoupling, especially in larger applications.

Are there any performance differences?

Yes, signals can introduce some overhead due to their flexibility, while callbacks are generally more efficient since they are direct function calls.