Callback Implementations in C++
Paul A. Jakubik
Sunquest Information Systems
4801 E. Broadway Blvd.
Tucson AZ 85711
phone: 520-733-6541
fax:   520-733-6631
paj@sunquest.sunquest.com

abstract:
This paper decomposes the callback solution proposed in [Hickey] to
show all of the patterns involved in transforming a simple solution
for having a couple of objects talk to each other to a sophisticated
callback solution.  After exposing all of the decisions made in
developing Hickey s callbacks, the paper shows how the pattern
decomposition exposes a decision point where a different and more
widely used pattern could be applied.  By appliying this alternative
pattern and following up with additional patterns to finish off the ne
design, the solution evolves into a different callback library that,
while slightly less efficient, is simpler and more flexible than the
calbacks presented in [Hickey]