Am 23.08.2017 16:58 schrieb "Marcos Douglas B. Santos" <m...@delfire.net>: > > On Wed, Aug 23, 2017 at 11:00 AM, Anthony Walter <sys...@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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