Re: Common ancestor (visibility rules)

[dmitry6243@my-deja.com]

In article <38E3B8B8.55305DCB@averstar.com>,
Tucker Taft <stt@averstar.com> wrote:

> In any case, the basic rule is that *all* names used in a context
> clause must be "full" expanded names, but *omitting* the
> "Standard." part. No hiding can happen, since only full names
> are allowed, all of which start at the same point in the name space
> (immediately within package Standard). In fact, "with Standard.A;"
would
> be interpreted as requesting that the library unit whose
> name-from-the-very-root is Standard.Standard.A be made visible.
>
> Once you get inside a compilation unit, the rules are different,
> and full expanded names are not required, though they may be
> used to overcome name hiding. And names-from-the-very-root (i.e.
> those that start with Standard) may also be used. But as mentioned
> above, such names may *not* be used in context clauses.

Thank you. It is crystal clear now. A bit confusing that in different
places one should use different names, but I understand the drawbacks of
the alternative of obligatory specifying the "Standard." prefix in WITH
and USE.

> There is a publically available ALRM on various web sites, including:
>
> http://www.adaic.org/standards/ada95.html

Just downloaded it (:-)) Thanks a lot.

Regards,
Dmitry Kazakov


Sent via Deja.com http://www.deja.com/
Before you buy.