C++ preprocessor __VA_ARGS__ number of arguments

Question

Simple question for which I could not find answer on the net. In variadic argument macros, how to find the number of arguments? I am okay with boost preprocessor, if it has

Answer 1

Boost Preprocessor actually has this as of Boost 1.49, as BOOST_PP_VARIADIC_SIZE(...). It works up to size 64.

Under the hood, it's basically the same as Kornel Kisielewicz's answer.