[fpc-pascal] Check In Interface Type Helpers

[Sven Barth]

Am 23.08.2017 16:58 schrieb "Marcos Douglas B. Santos" <md at delfire.net>:
>
> On Wed, Aug 23, 2017 at 11:00 AM, Anthony Walter <sysrpl at gmail.com> wrote:
> > Marcos, it doesn't work that way.
> >
> > Type helpers simply allow you to extend an existing type with new
methods
> > and/or properties. When you declare a type helper you extend all
instances
> > of said type given that:
> >
> > A) You 'use' the unit declaring the type helper in some other unit.
> > B) No other unit you're using also defines a type helper for that same
type.
> > Only one type helper per type allowed.
> >
> > As to what they are useful for, consider the following:
> >
> > type
> >   // IShellLink is define by Microsoft
> >   IShellLinkHelper = record helper for IShellLink
> >   public
> >     procedure Save(const Target, Description, Link: string);
> >   end;
>
> Anthony,
>
> I understood. In fact, this is a great feature for whose work with
> interfaces a lot.
> We can have small interfaces but add some methods in just some places,
> extending such interfaces.
>
> Is this compatible with Delphi?

Interface helpers are only supported by FPC. But the other helpers (class,
record, primitive types) are Delphi compatible.

Regards,
Sven
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