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Asked: 2026-05-11T22:15:27+00:00

I’m trying to write a generic class which contains a generic TObjectList< T >

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I’m trying to write a generic class which contains a generic TObjectList< T > which should contain only Elements of TItem.

uses
  Generics.Collections;

type
  TItem = class
  end;

  TGenericClass<T: TItem> = class
  public
    SimpleList: TList<T>; // This compiles
    ObjectList: TObjectList<T>; // This doesn't compile: Compiler complaints that "T is not a class type"
  end;

Is this a wrong syntax? BTW: TGenericClass< T: class> compiles, but then the Items in the List are not TItem anymore which is what I don’t want.

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1 Answer

  1. Editorial Team

    This is a known bug with the D2009 compiler. It will most likely be fixed soon, either in an update or hotfix for 2009, or in Delphi 2010 (Weaver) once it gets released. Until then, you need some sort of workaround, unfortunately. 🙁

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