[Newbies] Stef, BotsInc problem...

[David Urquhart]

Hi Blake

I could be well off base here - I'm a beginner too!

Bert told me... "doOnlyOnce:" is essential for not getting a gazillion of 
debuggers.  Read its comment to learn how to rearm it.

Here's how Bert suggested it be used with 'halt'.

self doOnlyOnce: [self halt].

As for why the system keeps running I can only suggest that its by design.  
Squeak is different to other languages because its actually an environment, 
and a remarkable environment with 'late binding' such that objects (classes 
and instances) can be dynamically changed during runtime.  So you can debug 
- actually change code - without stopping the system.

Of course you may WANT to stop the system because defective code could be 
dangerous - but that would be different to what should be default behaviour 
for a debugger in the context of Squeak.  To actually stop your code you'd 
have to send it a message that it can handle I guess :)  You'd need a 
'freeze' method.

Dave


DAVID URQUHART




>From: Blake <blake at kingdomrpg.com>
>Reply-To: "A friendly place to get answers to even the most basic 
>questionsabout Squeak." <beginners at lists.squeakfoundation.org>
>To: "A friendly place to get answers to even the most basic questions 
>aboutSqueak." <beginners at lists.squeakfoundation.org>
>Subject: [Newbies] Stef, BotsInc problem...
>Date: Mon, 22 Jan 2007 14:47:27 -0800
>
>Stef,
>
>	I'm doing the Bots Inc thing with my son and we have a problem on the  
>debugging section. When we code
>
>self halt.
>
>	That brings up the debugger and then continues. It doesn't halt!
>
>	Done inside the 4 timesRepeat loop, it brings up four debuggers, all  
>useless because the program keeps going and terminated before you can do  
>anything with it.
>
>	Anyone have any ideas?
>
>	===Blake===
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