Iterator owning a Arc<DB>? about rust-rocksdb HOT 2 OPEN

pub struct MyIteratorWrapper {
    // order is important here because the iterator has to be dropped before the DB
    iter: rocksdb::DBRawIterator<'static>,
    db: Arc<rocksdb::DB>,
}

impl MyIteratorWrapper {
    pub fn new(db: Arc<rocksdb::DB>) -> Self {
        let iter = unsafe {
            std::mem::transmute::<rocksdb::DBRawIterator<'_>, rocksdb::DBRawIterator<'static>>(
                db.raw_iterator(),
            )
        };

        MyIteratorWrapper { db, iter }
    }
    pub fn item(&mut self) -> Option<(&[u8], &[u8])> {
        self.iter.item()
    }
    pub fn valid(&self) -> bool {
        self.iter.valid()
    }

    pub fn next(&mut self) {
        self.iter.next();
    }

    pub fn seek_to_first(&mut self) {
        self.iter.seek_to_first()
    }
    // add some more methods
}