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Comment by gridspy | Hacker News Reader

> Let's stay I have a base class A. Let's say I have 70 classes that inherit from A.

The alternative case is that you have 70 classes that CONTAIN A. You still only have to change A.

Yes, but in my example, in the 70 classes, all the ::Read and ::Write methods must still say:

    a.Read( ... )
    a.Write( ... )

And depending on the use case and design, they also need methods such as:

   A& GetA() { return a; );
   const A& GetA() const { return a; }