Re: What good is ILE?

[whatt sson <whattssonn@xxxxxxxxx>]

> For me, a big advantage of ILE is the ability to have multiple levels of
privacy.

Privacy?

Is that a correct term in this context? Never heard or read about it using
the term "privacy".

Public/private, encapsulation, information hiding, etc, but privacy is
something that applies to something like facebook (or rather not).



On Tue, Feb 5, 2013 at 1:10 AM, Barbara Morris <bmorris@xxxxxxxxxx> wrote:

> On 2013/2/3 8:17 PM, w 4038 wrote:
> > What good is ILE??
> > ...
> > All the complexity just increases the potential for coding errors.
>
> For me, a big advantage of ILE is the ability to have multiple levels of
> privacy. Increased privacy tends to decrease the potential for coding
> errors.
>
> Say A calls B to do some subtask, and you want to change the first
> parameter for B to be bigger.
>
> If B is a separate *PGM, then B is public to the entire system. You now
> have to do some analysis to determine who is calling B, so you can
> increase the size of the variable that is being passed to B by all
> callers. If you miss one of the callers of B, you might not find out
> about the error until years later, if the storage corruption caused by
> the parameter mismatch doesn't cause an exception.
>
> If B is a _non-exported_ procedure in the same module as A, then B is
> private to the module containing A and B. You don't have to do any
> analysis at all. It is impossible to miss compiling one of the callers
> of B. And even if you miss one of the callers of B so you don't change
> the length of its parameter, the compiler will tell you immediately.
>
> --
> Barbara
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