static counter in c++

Question

I\'m trying to create a Data class whose objects each hold a unique ID.

I want the 1st object\'s ID to be 1, the 2nd to be 2, etc. I must use a st

Answer 1

This:

class Data
{
private:
   static int ID;
   const int currentID;
public:
   Data() : currentID(ID++){
   }
};

Besides a static counter, you also need an instance-bound member.