public member class
<bitset>

std::bitset::reference

class reference;
Reference-like type
This embedded class is the type returned by bitset::operator[] when applied to non const-qualified bitset objects. It accesses individual bits with an interface that emulates a reference to a bool.

Its prototype is:
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class bitset::reference {
  friend class bitset;
  reference();                                        // no public constructor
public:
  ~reference();
  operator bool() const;                              // convert to bool
  reference& operator= (bool x);                      // assign bool
  reference& operator= (const reference& x);          // assign bit
  reference& flip();                                  // flip bit value
  bool operator~() const;                             // return inverse value
}

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class bitset::reference {
  friend class bitset;
  reference() noexcept;                               // no public constructor
public:
  ~reference();
  operator bool() const noexcept;                     // convert to bool
  reference& operator= (bool x) noexcept;             // assign bool
  reference& operator= (const reference& x) noexcept; // assign bit
  reference& flip() noexcept;                         // flip bit value
  bool operator~() const noexcept;                    // return inverse value
}

C++