This is for C++ but should apply to any OO language.

Trying to figure out the correct object oriented apporach to do the following (this is what I do in C).

struct Container {
  enum type;
  union {
     TypeA a;
     TypeB b;
  };
}

The type field determines if it TypeA or TypeB object.

I am using this to handle responses coming back from a connection, they get parsed and get put into this structure and then based on the message type the appropriate fields get filled in.

e.g.

struct Container parseResponse(bufferIn, bufferLength);

Is there an OO approach for doing this?