pub unsafe extern "C" fn tsk_treeseq_general_stat(
    self_: *const tsk_treeseq_t,
    K: tsk_size_t,
    W: *const f64,
    M: tsk_size_t,
    f: general_stat_func_t,
    f_params: *mut c_void,
    num_windows: tsk_size_t,
    windows: *const f64,
    options: tsk_flags_t,
    result: *mut f64
) -> c_int