datum_bool_to_int datum_ceil datum_degrees datum_float_round datum_float_to_int datum_floor datum_int_to_float datum_radians ensure_common_dimension ensure_continuous ensure_has_not_Z ensure_has_T ensure_has_X ensure_has_Z ensure_linear_interp ensure_nonlinear_interp ensure_not_month_duration ensure_not_negative ensure_not_negative_datum ensure_not_null ensure_one_not_null ensure_one_true ensure_positive ensure_positive_datum ensure_positive_duration ensure_same_continuous_interp ensure_same_interp ensure_same_temporal_type ensure_temporal_isof_basetype ensure_temporal_isof_subtype ensure_temporal_isof_type ensure_valid_day_duration ensure_valid_interp ensure_valid_temporal_set ensure_valid_temporal_temporal ensure_valid_tnumber_numspan ensure_valid_tnumber_numspanset ensure_valid_tnumber_tbox ensure_valid_tnumber_tnumber float_degrees float_round intersection_temporal_temporal MEOS_INTERP_STR_MAXLEN MOBDB_VERSION_STR_MAXLEN mobilitydb_full_version mobilitydb_version mrr_distance_scalar not_negative_datum positive_datum positive_duration round_fn tbool_to_tint tdiscseq_from_base_temp temparr_out temparr_round temporal_bbox_ptr temporal_cmp temporal_compact temporal_copy temporal_duration temporal_end_inst temporal_end_instant temporal_end_sequence temporal_end_timestamptz temporal_end_value temporal_eq temporal_from_base_temp temporal_ge temporal_gt temporal_hash temporal_in temporal_inst_n temporal_instant_n temporal_instants temporal_instants_p temporal_interp temporal_le temporal_lower_inc temporal_lt temporal_max_instant temporal_max_value temporal_mem_size temporal_min_inst temporal_min_instant temporal_min_value temporal_ne temporal_num_instants temporal_num_sequences temporal_num_timestamps temporal_out temporal_restart temporal_round temporal_scale_time temporal_segments temporal_sequence_n temporal_sequences temporal_sequences_p temporal_set_bbox temporal_set_interp temporal_set_tstzspan temporal_shift_scale_time temporal_shift_time temporal_start_inst temporal_start_instant temporal_start_sequence temporal_start_timestamptz temporal_start_value temporal_stops temporal_subtype temporal_time temporal_timestamps temporal_timestamptz_n temporal_to_tinstant temporal_to_tsequence temporal_to_tsequenceset temporal_to_tstzspan temporal_tsequence temporal_tsequenceset temporal_upper_inc temporal_value_n temporal_values temporal_values_p tfloat_ceil tfloat_degrees tfloat_floor tfloat_radians tfloat_to_tint tfloatseq_stops_iter tint_to_tfloat tnumber_integral tnumber_set_span tnumber_shift_scale_value tnumber_to_span tnumber_to_tbox tnumber_twavg tnumber_valuespans tsequence_from_base_temp tsequence_stops tsequenceset_from_base_temp tsequenceset_stops

ensure_not_negative() bool ensure_not_negative ( int  i ) Ensure that a number is positive or zero.