Function leveldb_writebatch_iterate

pub unsafe extern "C" fn leveldb_writebatch_iterate(
    b: *mut leveldb_writebatch_t,
    state: *mut c_void,
    put: extern "C" fn(*mut c_void, *const c_char, size_t, *const c_char, size_t),
    deleted: extern "C" fn(*mut c_void, *const c_char, size_t),
)