[fpc-devel] class abstract, class sealed implementation. please review.

[Marco van de Voort]

In our previous episode, dmitry boyarintsev said:
> > Packages don't have external classes. ?A package is fully transparent to the
> > program, IOW when linking to a package there are proper .ppu's and
> > everything, and there is no "external" link step.
> 
> So it would be like using delphi's dcu (without .pas files).

Yes. Linking to such units is not fundamentally different from linking to
other precompiled code.  But on Delphi this is in .dcp packages. (since
packages can also have static parts)

> Some class/vars/consts/functions are avaiable and declared in package
> file, but the only they to see a full declaration is via documention,
> rather than header-sources.

I don't understand this.