Usage may be clearer with some code.... leaving out pp includes.
The file models/Furnace.h includes <boost/mpl/list.hpp>
---- IncludeAllModels.h
#define SUBCLASS_LIST \
BOOST_PP_TUPLE_TO_LIST( \
3, \
( \
Slitter, \
Scalper, \
Furnace \
) \
) \
//< List of all models
#define FILE_SUFFIX .h
#define FILE_PATH models/
#define LIST SUBCLASS_LIST
#include "ComputedInclude.h"
---- ComputedInclude.h
#define LIST_SIZE BOOST_PP_LIST_SIZE (LIST)
#define ITER_SIZE BOOST_PP_DEC (LIST_SIZE)
#define BOOST_PP_ITERATION_LIMITS (0, ITER_SIZE)
#define BOOST_PP_FILENAME_1 "ComputedIncludeIteration.h"
#define HARPS_CI 1
#include BOOST_PP_ITERATE()
#undef HARPS_CI
---- ComputedIncludeIteration.h
#define ITER BOOST_PP_ITERATION()
#define THIS_ITEM BOOST_PP_LIST_AT ( LIST, ITER)
#define FILE_NAME BOOST_PP_CAT (THIS_ITEM, FILE_SUFFIX)
#define FULL_NAME BOOST_PP_CAT (FILE_PATH, FILE_NAME)
#define FN BOOST_PP_STRINGIZE (FULL_NAME)
#include FN
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