The BOOST_PP_SEQ_HEAD macro expands to the first element in a seq.

Usage

BOOST_PP_SEQ_HEAD(seq)

Arguments

seq
The seq from which the first element is extracted.

See Also

Requirements

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

Sample Code 

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

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

BOOST_PP_SEQ_HEAD(SEQ) // expands to a
BOOST_PP_SEQ_TAIL(SEQ) // expands to (b)(c)