Preprocessor_macros.h

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#include <boost/preprocessor/arithmetic/inc.hpp>
#include <boost/preprocessor/comparison/not_equal.hpp>
#include <boost/preprocessor/repetition/for.hpp>
#include <boost/preprocessor/tuple/elem.hpp>
 
#define PRED(r, state) \
   BOOST_PP_NOT_EQUAL( \
      BOOST_PP_TUPLE_ELEM(2, 0, state), \
      BOOST_PP_INC(BOOST_PP_TUPLE_ELEM(2, 1, state)) \
   ) \
   
#define OP(r, state) \
   ( \
      BOOST_PP_INC(BOOST_PP_TUPLE_ELEM(2, 0, state)), \
      BOOST_PP_TUPLE_ELEM(2, 1, state) \
   ) \
 
#define XSTR(a) STR(a)
#define STR(a) #a