What are some alternatives to exceptions in C++20?

What are some alternatives to exceptions in C++20?

In C++20, you can use features like std::expected and std::variant as alternatives to exceptions for error handling.

Can you explain how std::expected works?

Sure! std::expected is a template that represents a value that may either hold a valid result or an error. It allows you to handle errors without throwing exceptions.

What about std::variant? How is it different?

std::variant is a type-safe union that can hold one of several types. It's useful for returning different types of results, including error states, without exceptions.

Are there any performance benefits to using these alternatives?

Yes, using std::expected or std::variant can lead to better performance in some cases, as they avoid the overhead of exception handling.