Abstract
This column is a combination of about three different topics.
First, it wraps up the discussion of Indirect Visiton pattern
that started 2 columns ago, and continued in the previous column.
The wrap up looks at how to handle certain common situations when
using an Indirect Visitor. It also considers some of the
disadvantages of this pattern (the advantages were discussed in
some detail in Parts 1 and 2). The second part of this column
looks back at previous columns and clears up a few mistakes and
oversights. Finally, the column introduces the topics that I will
be looking at over the next year or so -- using the Standard C++
library on real world projects.