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I reference the cpp core guidelines all the time. It's not dead at all, things like clang-tidy make references to it constantly for rationale behind recommendations.

There's only a few things I'm not a fan of, mostly around mutable out parameters (I prefer pointers not refs to make it clear at the call site it's a potential mutation)

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reference as in a style-guide? Or are you actually using the guidelines support library with things like gsl::index ? I've never seen it used in the wild

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.

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