Re: global variable change in substack not available to main stack

[slava@lexiconbridge.com]

Interesting. Thanks, Jacque. Mark, yes I see your point. You are right.

S.

Sent from my mobile so please excuse brevity and typos.

----- Reply message -----
From: "J. Landman Gay" <jacque at hyperactivesw.com>
To: "How to use LiveCode" <use-livecode at lists.runrev.com>
Subject: global variable change in substack not available to main stack
Date: Sun, Jul 10, 2011 2:02 pm


On 7/10/11 9:29 AM, Slava Paperno wrote:
> I'm curious about globals and the message box. I've been doing both
> (omitting the global declaration and including it) and I haven't seen any
> difference, but I've seen conflicting opinions in the posts here as well as
> some forums. What's the skinny on this?

The message box has access to all globals for me, without any 
declarations. I don't use explicitVariables though; maybe that makes a 
difference.

It's also fine to put your global declarations inside each handler that 
needs to use it. It's become customary to put it at the top of the 
script but that isn't required.

In fact, to backtrack a bit, with explicitvariables set to false, it is 
actually possible to have both a global and a local variable with the 
same name in the same script as long as the global isn't declared at the 
top. I know we had a discussion about this before where I agreed it 
couldn't happen, but I've just tried it again and in fact you can, if 
you declare your global inside the handler:

on setup
   global testVar
   put 1 into testVar
   put testVar
end setup

on test
   put 2 into testVar
   put testVar
end test

Turn off explicitVariables and run "setup" first from the message box to 
make sure the global is initialized. After that you'll get different 
numbers depending which you call.

The failure I had when I tested before is that, like most people, I was 
declaring the global outside the handlers. I'd never recommend this kind 
of naming, of course.

-- 
Jacqueline Landman Gay         |     jacque at hyperactivesw.com
HyperActive Software           |     http://www.hyperactivesw.com

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