Method modify_or_insert

src/models/common.rs:572–580

(&self, k: K, modify: M, insert: I)

    }

    pub fn modify_or_insert<M, I>(&self, k: K, modify: M, insert: I)
    where
        M: FnOnce(&mut V),
        I: FnOnce() -> V,
    {
        let index = self.hash_key(&k);
        let mut ht = self.hash_table_list[index].lock().unwrap();
        ht.entry(k).and_modify(modify).or_insert_with(insert);
    }

    // works exactly like `modify_or_insert`, but takes a value `T`, which is passed to both
    // closures (only one actually runs, so only passed to one of them), which is not possible