What are the alternatives to std::optional in C++17?

What are the alternatives to std::optional in C++17?

In C++17, alternatives to std::optional include using pointers, std::variant, and custom types. Each has its use cases.

Can you explain when to use std::variant instead of std::optional?

Sure! Use std::variant when you need to represent multiple types, while std::optional is for a single type that may or may not be present.

What about using pointers? Are there any downsides?

Yes, using raw pointers can lead to memory management issues, such as leaks or dangling pointers. Smart pointers are safer.

How does std::optional compare to using a custom type?

std::optional is simpler for cases where you just need to indicate presence or absence, while a custom type can encapsulate more complex logic.

Are there performance considerations with these alternatives?

Yes, std::optional is generally efficient, but the performance can vary based on the alternative used and the specific use case.