Is '@' used in C++?

c++, keyword

Solution

No, it isn’t used in C++. It doesn’t appear anywhere in the standard. In particular, it does not appear in the set of legal C++ characters [lex.charset].

Problem

Is '@' used in C++? In this yacc file it is listed as a token. And i am sure i cant use @ as part of a variable name. Is @ used in C++? and how might i use it?

Original source