// Java
public class Cell<K, V> {
    private K _key;
    private V _value;
    public Cell(K k, V v) {
        _key = k;
        _value = v;
    }
    public boolean equivalent(Cell<K, V> c) {
        return equivalent(c.getKey());
    }
    public boolean equivalent(K k) {
        return key.equals(k);
    }
    public K getKey() { return _key; }
    public V getValue() { return _value; }
}

// C++
template<typename K, typename V>
class Cell{
public:
    Cell(K k, V v): _key(k), _value(v) {}
    bool equivalent(Cell *c) {
        return equivalent(c->getKey());
    }
    bool equivalent(K k) {
        return _key.equals(k);
    }
    K getKey() { return _key; }
    V getValue() { return _value; }

private:
    K _key;
    V _value;
};