Bidirectional Generators

[william tanksley]

Okay, I'm almost finished with my first bidirectional generator. By
"almost finished" I mean both that it's almost working, and that I'm
almost about to replace it with a class that works a bit more like
what I currently understand.

Surely some other people have worked with this feature... Are there
any pages that discuss how it's been useful?

No, I don't want to see an implementation of coroutines. I get that
one already. :-)

-Wm