[fpc-devel] Initialize/Finalize management operators and Default intrinsic

[Sven Barth]

Am 13.04.2016 03:38 schrieb "Thorsten Engler" <thorsten.engler at gmx.net>:
>
> Sven Barth wrote:
> > In that specific example you would be right, but units are seldomly used
> in
> > isolation and once both unit1 and unit2 are used in more units it isn't
> that
> > clear (to the user) anymore which unit is initialized first.
>
> I've always found the rules about this very clear in Delphi (and I assumed
> so far it applies to FPC as well):
>
> If your unit depends on another unit being initialized before and
finalized
> after your unit, then that other unit must be listed in the interface uses
> clause.
>
> Units in the implementation uses clause may initialize before or after
your
> unit, and the order may change in the future depending on the contents of
> other units in the project. But all units in the interface section are
> guaranteed to have been initialized before your unit and are guaranteed to
> finalize after your unit.
>
> So if you depend on another unit being initialized first, list it in the
> interface section. If you can't because of circular references, then your
> code is broken and what you want to do is impossible.
>
> Delphi ensures this is true, even when dynamically loaded packages come
into
> play, by essentially creating the following code for each unit behind the
> scenes:

I had thought about something like this for dynamic packages as well. Seems
like this would be useful for other things as well then.

Regards,
Sven
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