Union in c++ are they feasible

Question

Can a union in C++ have a member function? How do union with data members and member functions exist if an object is created?

If I suppose yes, then are they feasible an

Answer 1

9.5/1

A union can have member functions (including constructors and destructors), but not virtual (10.3) functions. A union shall not have base classes. A union shall not be used as a base class. An object of a class with a non-trivial constructor (12.1), a non-trivial copy constructor (12.8), a non-trivial destructor (12.4), or a non-trivial copy assignment operator (13.5.3, 12.8) cannot be a member of a union, nor can an array of such objects

What do you mean by How do union with data members and member functions exist if an object is created? Member functions (non-virtual) take no space in an instance of any class/union.