This post originated from an RSS feed registered with Ruby Buzz by Red Handed. Original Post: A Callcc w/ Dill Havarti and Ham Feed Title: RedHanded Feed URL: http://redhanded.hobix.com/index.xml Feed Description: sneaking Ruby through the system Latest Ruby Buzz Posts Latest Ruby Buzz Posts by Red Handed Latest Posts From RedHanded

An old one, but worth repeating if you’ve yet to understand continuations:

Say you’re in the kitchen in front of the refrigerator, thinking about a sandwitch. You take a continuation right there and stick it in your pocket. Then you get some turkey and bread out of the refrigerator and make yourself a sandwitch, which is now sitting on the counter. You invoke the continuation in your pocket, and you find yourself standing in front of the refrigerator again, thinking about a sandwitch. But fortunately, there’s a sandwitch on the counter, and all the materials used to make it are gone. So you eat it. :-)

A continuation doesn’t save data. It’s just a closure that closes over the execution stack (and any lexicals associated with it; thus the “I want a sandwitch” thought). If things change between the taking and invoking of the continuation, those things remain changed after invoking.

From the perl6 list.