COND_CODE_1(H_NRF_SDH_OBSERVER_PRIO_HIGHEST_##level, (), \
(COND_CODE_1(H_NRF_SDH_OBSERVER_PRIO_HIGH_##level, (), \
(COND_CODE_1(H_NRF_SDH_OBSERVER_PRIO_USER_##level, (), \
(COND_CODE_1(H_NRF_SDH_OBSERVER_PRIO_USER_LOW_##level, (), \
(COND_CODE_1(H_NRF_SDH_OBSERVER_PRIO_LOWEST_##level, (), \
(BUILD_ASSERT(0, "Invalid priority level")))))))))))
Utility macro to check for observer priority validity.