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12 # ifndef MSGPACK_PREPROCESSOR_FACILITIES_IS_EMPTY_OR_1_HPP
13 # define MSGPACK_PREPROCESSOR_FACILITIES_IS_EMPTY_OR_1_HPP
23 # define MSGPACK_PP_IS_EMPTY_OR_1(x) \
25 MSGPACK_PP_IS_EMPTY(x MSGPACK_PP_EMPTY()), \
26 MSGPACK_PP_IDENTITY(1), \