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Is this a valid technique?

jasonclarke asked
Last Modified: 2010-04-02
I have a problem that involves converting data from one type to another (type in the physical not in the code sense).

The example added as a comment below gives an example of the structure I have come up with.

What I would like thoughts on is:

      i) Is it reasonable to keep the headers for the derived classes in the implementation file? (The reason I reckon this is OK is because I don't want anyone to create instances other than via the base classes factory method - and it cuts down the need for lots of files).
       ii) Is there a better way to do it?
      iii) Is there anything wrong with it?
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