pub unsafe extern "C" fn rocksdb_writebatch_wi_iterate(
    b: *mut rocksdb_writebatch_wi_t,
    state: *mut c_void,
    put: Option<unsafe extern "C" fn(arg1: *mut c_void, k: *const c_char, klen: usize, v: *const c_char, vlen: usize)>,
    deleted: Option<unsafe extern "C" fn(arg1: *mut c_void, k: *const c_char, klen: usize)>
)