You want the type of the object to be included in the type of the
collection?
am I right to think you want this:
TMySet = set of (TMyClass);
MySet : TMySet;
MyOtherClass : TMyOtherClass;
...
MySet.Add( MyOtherClass); // Error Here!!
But it is possible to implement this - verbose, and a
lot of effort for something simple, and mostly
at runtime (a smalltalker shouldn't be afraid of that ;) but possible.
Neven MacEwan wrote:
>
> Kurt
>
> The problem is not so much TList and TCollection (or TObjectList or
> TOwnedCollection) but a limitation
> in object pascal itself - Without it being included as base type it can't be
> type safe.
>
> Someone will correct me if I'm wrong but the only OO thing about object
> pascal is the keyword 'class',
> but none of the base types are OO
>
> They almost did it in D5 with dynamic arrays it would seem to be so simple
> to extend it to..
>
> AClass = class
> end;
>
> Var
> anArray: array of AClass
>
> TTFN
> Neven
>
> > I would like to see this:
> > TCollection = (any old bunch of objects)
> > TList = TCollection + Sort
> > TSet = TCollection + (only one of each object)
> > and then anyone can define as many subclasses as they want
> > (eg: TTable = TCollection + (all objects have a unique key))
> > without banging into a "half overlap" with what is provided by Delphi.
>
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