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, or custom wrapper types.

Can you explain how std::variant can be used as an alternative?

Sure! std::variant can hold one of several types, allowing you to represent a value that may or may not be present.

What are the pros and cons of using pointers instead of std::optional?

Using pointers can lead to null pointer dereferencing issues, but they can be more lightweight than std::optional.

Are there any performance considerations when choosing between these alternatives?

Yes, std::optional is generally more efficient for single values, while std::variant can be more complex but flexible.