In reply to nocsmsourabh:
What’s the Problem. You don’t have to use all data members of a class and you can even use only part seöects or parameterize the with of the data memmbers.
The key question is, is there a functional reason for using 2 different seq_item types?
The Approach is:
1 seq_item belongs to a sequence class, because it is parameterized for exactly this class.