I don't use the gsl, no, but I do use linters (like clang-tidy) that enforce a decent chunk of the guide. And reference like a style guide (or any documentation really), yes.
> but I do use linters (like clang-tidy) that enforce a decent chunk of the guide. And reference like a style guide (or any documentation really), yes.
That's my experience as well. Clang-tidy, clang-format, cppcheck and Core Guidelines. I don't recall the last project I've worked that didn't used that combo.