Purpose of Unions in C and C++

Question

I have used unions earlier comfortably; today I was alarmed when I read this post and came to know that this code

union ARGB
{
    uint32_t colour;

    str         


        

Answer 1

For one more example of the actual use of unions, the CORBA framework serializes objects using the tagged union approach. All user-defined classes are members of one (huge) union, and an integer identifier tells the demarshaller how to interpret the union.