Tanton Gibbs wrote:
You can use BOOST_PP_LIST_FOR_EACH
#define ARG_LIST (char, (int, (unsigned int, (long, ...)))) #define DO_IT(r, data, elem) void foo( elem );
BOOST_PP_LIST_FOR_EACH( DO_IT, , ARG_LIST ) ^ This empty argument is undefined in C++. In C99, it is allowed and called a "placemarker." Instead of passing nothing, just pass anything and ignore it.
// ----- // #include <boost/preprocessor/list/for_each.hpp> #define ARG_LIST \ (char, (int, (unsigned, (long, BOOST_PP_NIL)))) \ /**/ #define DO_IT(r, ignored, elem) \ void foo( elem ); \ /**/ BOOST_PP_LIST_FOR_EACH( DO_IT, ?, ARG_LIST ) #undef ARG_LIST #undef DO_IT // ----- // Note that there are other ways to do this also. For instance, use of "sequences" makes the definition of ARG_LIST easier: // ----- // #include <boost/preprocessor/seq/for_each.hpp> #define ARGS \ (char)(int)(unsigned)(long) \ /**/ #define DO_IT(r, ignored, elem) \ void foo( elem ); \ /**/ BOOST_PP_SEQ_FOR_EACH( DO_IT, ?, ARGS ) #undef ARGS #undef DO_IT // ----- // Of course, if what you want to generate is much larger, you might want to use some form of vertical repetition: // ----- // #include <boost/preprocessor/iteration/local.hpp> #include <boost/preprocessor/seq/elem.hpp> #define ARGS \ (char)(int)(unsigned)(long) \ /**/ #define BOOST_PP_LOCAL_MACRO(n) \ void foo( BOOST_PP_SEQ_ELEM(n, ARGS) ); \ /**/ #define BOOST_PP_LOCAL_LIMITS \ (0, BOOST_PP_SEQ_SIZE(ARGS) - 1) \ /**/ #include BOOST_PP_LOCAL_ITERATE() #undef ARGS // ----- // Regards, Paul Mensonides