#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/seq/size.hpp>
#include <boost/preprocessor/control/if.hpp>
#include <boost/preprocessor/comparison/equal.hpp>
 
#define RET_TYPE_void 1)(1
#define IS_VOID(type) BOOST_PP_EQUAL(BOOST_PP_SEQ_SIZE((BOOST_PP_CAT(RET_TYPE_,type))),2)
 
#include <cstdio>
 
int main(int argc,char *argv[])
{
    BOOST_PP_IF(IS_VOID(void),printf("is void\n"),printf("is not void\n"));
    BOOST_PP_IF(IS_VOID(int),printf("is void\n"),printf("is not void\n"));
    return 0;
}

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