From: Tobias Reif <tobiasreif@...>
Date: 2002-02-28T06:37:58+09:00
Subject: Re: RCR?: parallel to until: as_soon_as

Joel VanderWerf wrote:


>>I see. But performance is not always the top priority, and users make
>>the choice which constructs to use.
>>
> I was guessing that users wouldn't have a choice, because every "@x =
> ..." would have to be checked for a hook, because the hook on @x could
> be turned on or off dynamically.


I meant: users have the choice to use the construct, don't, or use a 
more complex but less time consuming construct.


> Here's a dull little example, but it shows what I meant by intercepting
> the attr writer. It might be used to accept lines into a fixed length
> text field.


Thx for the example and the tips.
I still think a very simple construct for firing a block as soon as / 
each time a condition turns true would be useful. No code inside the 
class is required; just do observe visible objects and their state.


Tobi

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