How does this do what it does (C++ classes, use of colon)

[sterretje]

@gcjr

the code you've posted is a poor example of a class

I can accept the fact that it's poor code

@gcjr

why is there both a constructor and not one, but repeated calls to begin().

Two different objects of different derived classes and the show method will do different things. I might see it wrong.

I will try to read the link later.