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12 # ifndef MSGPACK_PREPROCESSOR_FACILITIES_IS_1_HPP
13 # define MSGPACK_PREPROCESSOR_FACILITIES_IS_1_HPP
20 # define MSGPACK_PP_IS_1(x) MSGPACK_PP_IS_EMPTY(MSGPACK_PP_CAT(MSGPACK_PP_IS_1_HELPER_, x))
21 # define MSGPACK_PP_IS_1_HELPER_1