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Report From: Delphi-BCB/Compiler/Delphi/Language/Overloading    [ Add a report in this area ]  
Report #:  90333   Status: Open
class operator in class not working
Project:  Delphi Build #:  15.0.3953.35171
Version:    15.0 Submitted By:   Markus Ja
Report Type:  Basic functionality failure Date Reported:  12/15/2010 6:16:01 AM
Severity:    Serious / Highly visible problem Last Updated: 3/20/2012 3:50:14 AM
Platform:    All platforms Internal Tracking #:   26570
Resolution: Duplicate  Resolved in Build: : None
Duplicate of:  32998
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Description
None
Steps to Reproduce:
the followoing line generates a compiler error:
[DCC Fehler] Unit1.pas(20): E2123 PROCEDURE, FUNCTION, PROPERTY oder VAR erwartet

TMyClass = class
     class operator Implicit(a: Integer): TMyClass;
end;
----
class operator TMyClass.Implicit(a: integer): TMyClass;
begin
  //result := TMyClass.Create;
end;

This is a sample of the "New Language features since Delphi 7" site
http://edn.embarcadero.com/article/34324
Workarounds
None
Attachment
None
Comments

Blaise Thorn at 12/15/2010 4:53:31 PM -
As Designed.
Operator overloading is supported for record types only
http://docwiki.embarcadero.com/RADStudio/en/Operator_Overloading
As for http://edn.embarcadero.com/article/34324, the code snippet is probably for Delphi.NET. Nevertheless the description clearly states that "Delphi allows certain functions, or operators, to be overloaded within record declarations".

For the feature request, refer to QC#32998.

Also, please, avoid attaching .exe/.dcu files.

Markus Ja at 12/15/2010 10:31:41 PM -
FYI: In the help file it stated that it can be used within CLASSes and RECORDs. Here are some snippets from the documentation:
- No operators other than those listed in the table may be defined on a CLASS or record.
- To access a specific operator method of a specific CLASS or record
- The compiler will use an operator for a CLASS or record provided that:
- Overloaded operators are used MOST OFTEN in records (i.e. value types).
- Operator overloads are declared within CLASSES or records, with the following syntax:

By the way. the name "class operator" is confusing, when it only works on records! Thus, it would be good to highlight in the doc that it is only valid for records.

Server Response from: ETNACODE01

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