Boost.Preprocessor

Header <boost/preprocessor/comma.hpp>

#define BOOST_PP_COMMA()

Expands to a comma.

Commas need special handling in preprocessor code, because commas are used for separating macro parameters.

For example,

BOOST_PP_IF(1,BOOST_PP_COMMA,BOOST_PP_EMPTY)()

expands to a comma.

See

BOOST_PP_COMMA_IF()

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