Are dollar-signs allowed in identifiers in C++03?

Question

What does the C++ standard say about using dollar signs in identifiers, such as Hello$World? Are they legal?

Answer 1

The relevant section is "2.8 Identifiers [lex.name]". From the basic character set, the only valid characters are A-Z a-z 0-9 and _. However, characters like é (U+00E9) are also allowed. Depending on your compiler, you might need to enter é as \u00e9, though.