How can I use std::optional to return a NULL value?

Question

How can I return a value, similar to null, with std::optional? My function receives an int index as parameter to iterate through a list, if the index value is not valid, how this std::optional can be used to return a value similar to null?

user_2079303 · Answer

nullptr is to pointers what std::nullopt is to std::optional.

How can I use std::optional to return a NULL value?

1 Answers