Structs (Python)

The structs Cython module exposes the C++ plain-old-data types as Cython extension types. They are used internally by the framework and are not normally instantiated directly by users.

particle_t

Holds per-particle metadata extracted from ROOT:

Field	Type	Description
`index`	`int`	Sequential particle index in the event.
`type`	`bytes`	ROOT branch type prefix (e.g. `b"jet"`).
`lepdef`	`list[int]`	PDG IDs that count as leptons.
`nudef`	`list[int]`	PDG IDs that count as neutrinos.

data_t

Holds one ROOT leaf value together with its type tag (data_enum). Used internally by the io engine to pass typed data to build.

data_enum

Enumerates all supported ROOT leaf data types:

v_f, v_d, v_i, v_l, v_b, v_c, v_ull, v_ui, vv_f, vv_d, vv_i, vv_l, vv_b, vv_c, vvv_f, vvv_d, vvv_i, vvv_l, vvv_b.

(prefix v = vector/list, vv = nested list, vvv = doubly nested.)