Thread overview
[Issue 9048] New: Error: base classes expected instead of typeof when instantiating anonymous class
Nov 19, 2012
ogondza
Nov 19, 2012
timon.gehr@gmx.ch
Nov 21, 2012
Kenji Hara
November 19, 2012
http://d.puremagic.com/issues/show_bug.cgi?id=9048

           Summary: Error: base classes expected instead of typeof when
                    instantiating anonymous class
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: ogondza@gmail.com


--- Comment #0 from ogondza <ogondza@gmail.com> 2012-11-19 15:18:45 PST ---
Unlike, regular classes, anonymous classes seems to be impossible to instantiate when using typeof expression.

This works perfectly:

  new typeof(this)();
  new typeof(new Object())();

But these

  new class typeof(this) {};
  new class typeof(new Object()) {};

give (on v2.060)

  Error: base classes expected instead of typeof
  Error: { members } expected for anonymous class
  Error: found 'typeof' when expecting ';' following statement

It can be worked around aliasing the type first and then instantiating anonymous class of the aliased type. However, for an anonymous class it is necessary to instantiate in one expression.

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November 19, 2012
http://d.puremagic.com/issues/show_bug.cgi?id=9048


timon.gehr@gmx.ch changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |timon.gehr@gmx.ch
           Severity|normal                      |enhancement


--- Comment #1 from timon.gehr@gmx.ch 2012-11-19 15:35:51 PST ---
It is according to the language specification. It is the same parsing error as the one present in the following code:

class C{}
class D: typeof(new C){}

This is an enhancement.

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November 21, 2012
http://d.puremagic.com/issues/show_bug.cgi?id=9048


Kenji Hara <k.hara.pg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE


--- Comment #2 from Kenji Hara <k.hara.pg@gmail.com> 2012-11-20 19:48:17 PST ---
(In reply to comment #0)
>   new class typeof(this) {};
>   new class typeof(new Object()) {};

Using typeof in base class list is allowed in 2.061head, by fixing issue 1353.

*** This issue has been marked as a duplicate of issue 1353 ***

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