Re: alternate to global variables

From: B. v Ingen Schenau (bart_at_ingen.ddns.info)
Date: 09/17/04 

Date: Fri, 17 Sep 2004 17:49:13 +0200

Tom wrote:

> > What are you unhappy with? Why are you looking for a better, safer
> > way? Are you having a specific problem?
>
> Safer. I don't want the data to get "stepped on."
>
>
> > In principle, that is how it is done in C. The only thing
> > would be: Put ListOfNodes, LastNode and all the functions
> > working on them into a seperate translation unit and make
> > ListOfNodes and LastNode static. But that's as much as you
> > can do in C to protect them from the outside world.
>
> I intended to do that anyway, so at least I know I'm on the right track.
> I was looking to see if there was any more "protection" I could do.

Once you declare the variables as 'static', their names will not be visible
outside the source-file in which they are declared.
This means that the data can only be altered if you explicitly give out a
pointer to it, or if a bug elsewhere causes random memory to be trashed.
The first can easily be checked with a review of the code (only one file
involved) and the other can not be prevented anyway.

>
> Thanks!
> Tom

Bart v Ingen Schenau 

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