I want my in-project units depend on a single in-project unit which abstracts the actual used out-project units. i.e. instead of:

MyUnit1 -> RTLUnit
MyUnit2 -> RTLUnit

I want it to be:

MyUnit1 -> RTLAbstractorUnit
MyUnit2 -> RTLAbstractorUnit
RTLAbstractorUnit -> RTLUnit

So I try to write:

unit DataStructures;
{$mode objfpc}{$H+}
interface
uses
  Classes, SysUtils, Generics.Collections;
type
  // Error: Identifier not found "TObjectList"
  TMyList = TObjectList;
  // Error: Identifier not found "T"
  generic TMyList<T> = specialize TObjectList<T>;
  generic TMyList<T: class> = specialize TObjectList<T>;
  // Unhandled EAccessViolation followed by Error: Compilation raised
exception internally
  generic TMyList<T> = class(specialize TObjectList<T>);
  generic TMyList<T: class> = class(specialize TObjectList<T>);
  generic TMyList<T: class> = class(specialize TObjectList<T>) end;
implementation
end.

but neither of above seems to work. What is the correct way to write generic type aliases? Even if it's not real alias like the last 3, as long as it's working, I'm OK.

"leledumbo" wrote

but neither of above seems to work. What is the correct way to write

generic

type aliases? Even if it's not real alias like the last 3, as long as it's working, I'm OK.

Type aliases for generics are not supported.

Regards,
Sven

Type aliases for generics are not supported.

OK, but Delphi seems to support the last 3 variant which creates a generic subclass of a specialized generic type:
http://stackoverflow.com/questions/10060009/is-it-possible-to-create-a-type-alias-to-a-generic-class-in-delphi At least, it shouldn't make the compiler raise EAccessViolation, right? ;)

http://stackoverflow.com/questions/10060009/is-it-possible-to-create-a-type-alias-to-a-generic-class-in-delphi

At least, it shouldn't make the compiler raise EAccessViolation, right? ;)

Remind me not to jump over code examples... Yes, the last three should work. Would you please report a bug?

Regards,
Sven

Remind me not to jump over code examples... Yes, the last three should

work. Would you please report a bug?

Done: http://bugs.freepascal.org/view.php?id=30530