What is the performance impact of using exceptions in C++?

What is the performance impact 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 more efficient?

Yes, in scenarios where error handling is infrequent, exceptions can be more efficient than checking error codes after every operation, as they allow for cleaner code and separation of error handling.

What are some best practices for using exceptions in C++?

Some best practices include using exceptions for exceptional cases only, avoiding exceptions in performance-critical code, and ensuring that your code is exception-safe.