The following fails to compile in Delphi 2010. Does anyone happen to know if this work in XE3 or not?

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The following fails to compile in Delphi 2010. Does anyone happen to know if this work in XE3 or not?

type
  TMyParam = record
  end;
  TFoo = type TMyParam;  // <-- error

[DCC Error] E2086 Type 'TMyParam' is not yet completely defined

Comments

  1. Stefan GlienkeMay 7, 2013 at 5:49 AM

    No, not even in XE4 and since XE it raises the correct compiler error: E2574 Instantiated type can not be used for TYPE'd type declaration

    ReplyDelete
  2. Asbjørn HeidMay 7, 2013 at 5:52 AM

    Stefan Glienke Thanks for the quick reply. That's pretty shitty though. Do you know the reason?

    ReplyDelete
  3. Asbjørn HeidMay 7, 2013 at 6:00 AM

    Interestingly enough it works fine if I first alias the type:

    type
      TMyParam = record
      end;
      TStringMyParam = TMyParam; // alias
    // need new type block here, otherwise incomplete type error
    type
      TFoo = type TStringMyParam; // use aliased type, not direct type

    If I then get the type name of TFoo I get TMyParam.

    ReplyDelete
  4. Asbjørn HeidMay 7, 2013 at 6:03 AM

    I guess that's why it works then, it creates an alias instead of an actual type. Gah Delphi...

    Full code: http://delphi.nopaste.dk/p43509

    ReplyDelete

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