Section E.27

[petecasso]

In the Gadget example in this section, there's mention of using a std::pair.

Wouldn't it be more idiomatic to use std::optional, or std::expected here? It seems this section, dealing with not being able to use exceptions should be refreshed, based on language evolution.

[hsutter]

Editors call: Thanks! The guideline does generally say to 'use error codes' and that you can write your own struct, and std::expected is such a thing so falls under that guidance. The Guidelines don't do C++23 yet but when we do we can consider mentioning std::expected.