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[lukkio <>]

I've looked both the code and the book too.
I've understood that:
1. The overlay methods rely on sweep line, till here nothing new to me.
2. The sweep line it self rely is implemented by a design pattern "Visitor"
(this is interesting)

In this case i don't understand how the real visitor is implemented for
iterate (i suppose) along the elements on the sweep line and the performs
some operation on such element.

So the question is... how is implemented the visitor for the sweep line?

Lukkio



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