bitset::reference

class reference {
public:
    reference& operator=(bool b};
    reference& operator=(const reference& x);
    bool operator~() const;
    operator bool() const;
    reference& flip();
    };

The member class describes an object that designates an individual bit within the bit sequence. Thus, for b an object of type bool, x and y objects of type bitset<N>, and i and j valid positions within such an object, the member functions of class reference ensure that (in order):

• x[i] = b stores b at bit position i in x
• x[i] = y[j] stores the value of the bit y[j] at bit position i in x
• b = ~x[i] stores the flipped value of the bit x[i] in b
• b = x[i] stores the value of the bit x[i] in b
• x[i].flip() stores the flipped value of the bit x[i] back at bit position i in x