What are the performance implications of using exceptions in C++?

What are the performance implications of using exceptions in C++?

Using exceptions in C++ can introduce overhead due to stack unwinding and the need for additional code to handle exceptions. However, the impact varies based on how exceptions are used in your code.

Can you explain stack unwinding?

Stack unwinding is the process of cleaning up the stack when an exception is thrown. It involves calling destructors for all objects that were created in the current scope, which can add to the performance cost.

Are there scenarios where exceptions are preferred despite the performance cost?

Yes, exceptions can improve code readability and maintainability by separating error handling from regular control flow, making them preferable in many scenarios.

What are some alternatives to exceptions for error handling?

Alternatives include using error codes, assertions, or result objects that encapsulate success or failure, which can avoid the overhead of exceptions.