Re^2: Doing "it" only once

[Limbic~Region]

jdporter,
The first part of your response is identical to cog's. I will refer to my response there. I am pretty sure your last comment still only works in the most trivial of cases. Consider:

• Restarting most loops requires knowing where the previous left off
• Having more than 1 "run this once" statements complicates things dramatically - especially if order is unknown
• The "run this once" condition might not always be skipping to the next iteration in the loop

I am sure there are more and the point of the medidation isn't to enumerate them. Just assume for a second that the functionality existed and by some magic it didn't cost much - what would you do with it?

[jdporter]

Understood. But neither your (trivial) example motivating problem, nor your proposed solution, addresses any of those points either. So I don't quite grep why you have any issue with my/coq's answer.

Why don't you post a real-world problem that has all of your bulleted issues above, and then post a real-world solution for that problem?

[Limbic~Region]

jdporter,
See my reply to the AM.

Paragraph added
What are you calling my proposed solution? I have not provided any solution. I have outlined a functionality that does not exist and asked for people to think about how they would use it if it did.

I included the original example just so people could get an idea of what I was talking about. I wasn't hoping for people to provide solutions to specific cases but to think about what they would do if they had a built-in general purpose way of identifying code that once executed would disapear. So far, optimizing looping constructs appears to be the only application but I can't believe that's the only one.

[jdporter]

What are you calling my proposed solution?

I was referring, however inaccurately, to "the following inelegant code".

FWIW, lambdas are one way I typically address the need for dynamically replacing code at runtime, just as in your... "inelegant code" (for lack of a better name). In larger application contexts, object-oriented solutions are probably better, IMO.