The BOOST_PP_SEQ_SIZE macro expands to the size of a seq.

Usage

BOOST_PP_SEQ_SIZE(seq)

Arguments

seq
The seq whose size is to be calculated.

Requirements

Header:  <boost/preprocessor/seq/size.hpp>

Sample Code 

#include <boost/preprocessor/seq/size.hpp>

#define SEQ (a)(b)(c)

BOOST_PP_SEQ_SIZE(SEQ) // expands to 3