Mentioned on c.l.py:
http://cseng.aw.com/book/related/0,3833,0805311912+20,00.html
This is the full text of "Advanced Programming Language Design", available
online a chapter at a time in PDF format.
Chapter 2 (Control Structures) has a nice intro to coroutines in Simula and
iterators in CLU, including a funky implementation of the latter via C
macros that assumes you can get away with longjmp()'ing "up the stack"
(i.e., jumping back into a routine that has already been longjmp()'ed out
of). Also an intro to continuations in Io:
CLU iterators are truly elegant. They are clear and expressive.
They provide a single, uniform way to program all loops. They
can be implemented efficiently on a single stack.
...
Io continuations provide a lot of food for thought. They spring
from an attempt to gain utter simplicity in a programming
language. They seem to be quite expressive, but they suffer
from a lack of clarity. No matter how often I have stared at
the examples of Io programming, I have always had to resort to
traces to figure out what is happening. I think they are just
too obscure to ever be valuable.
Of course in the handful of other languages that support them, continuations
are a wizard-level implementation hook for building nicer abstractions. In
Io you can't even write a loop without manipulating continuations
explicitly.
takes-all-kinds-ly y'rs - tim
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