Unions in C++

1. Default access to a union is public, it can contain member functions and member data
2. It can’t have a static data members or a member of reference type.
3. It cannot have virtual functions
4. it cannot be used as base class nor it can have base class
5. An object of a class with a construct or a destructor or a user-defined assignment operator cannot be a member of a union [from openasthra]