CODEWITHSUNDEEP
delphigenerics
Razal K.A
Razal K.A

Reputation: 49

Delphi custom generic list

Can somebody please tell me why I am getting the

Incompatible type: 'TChild' and 'Class of TChild'

 TBase = class (TObject)
 end;

 TMyList<T: TBase> = class(TObjectList<T>)
 end;

The error comes when I declare a child from the base class and try to create a list of TChild.

TChild = class (TBase)
end;

TChildList = TMyList<TChild>;

Upvotes: 1

Views: 680

Answers (1)

David Heffernan
David Heffernan

Reputation: 613572

The code in the question is fine. Here is proof, a complete program that compiles:

program Project1;

{$APPTYPE CONSOLE}

uses
  System.Generics.Collections;

type
  TBase = class (TObject)
  end;

  TMyList<T: TBase> = class(TObjectList<T>)
  end;

  TChild = class (TBase)
  end;

  TChildList = TMyList<TChild>;

begin
end.

Clearly you need to edit the question to post code that exhibits the fault. Feel free to use the above as a template for how to provide a Delphi language SSCCE.

Upvotes: 4

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