Variable: c-identifier-key
c-identifier-key is a buffer-local variable defined in
cc-engine.el.gz.
Documentation
Regexp matching a fully qualified identifier, like "A::B::c" in
C++. It does not recognize the full range of syntactic whitespace
between the tokens; c-forward-name has to be used for that. It
should also not match identifiers containing parenthesis groupings,
e.g. identifiers with template arguments such as "A<X,Y>" in C++.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/cc-engine.el.gz
(c-declare-lang-variables)