Comment by valleyer
4 hours ago
Names beginning with double underbar (or single underbar + capital letter) are reserved. Single underbar + lowercase is not. C23 §6.4.2.1.
4 hours ago
Names beginning with double underbar (or single underbar + capital letter) are reserved. Single underbar + lowercase is not. C23 §6.4.2.1.
Also reserved as identifier with file scope, just not for "any use". In any case, the program used underbar + capital letter.
Ah, I hadn't noticed _SimpleSetNode.
This leaves out part of the clause.
Single underscore followed by non-uppercase is allowed, but not in file scope. This means that you can use them in structs and as local variables, but never as globals.
You're right, and I guess I've been breaking that rule for a while. What's the purpose there? The double-underbar and underbar-capital rules seem to be allowing for non-conflicting introduction of keywords. Is the single-underbar rule to protect standard library headers or something?