Hi,

TTestObject = object? ? i: integer;? end; TTestObjectList = specialize TFPGList<TTestObject>;

When I try to compile this code compiler said :

Error: Operator is not overloaded: "TTestObject" = "TTestObject"

I dont even know what is this mean!

Regards, Ara

TFPGList requires an = operator for the type you want to specialize with. While you could declare a global operator overload for TTestObject this won't help as it needs to be a local one. Only records with modeswitch advancedrecords support this currently, thus you should adjust your code like this:

=== code begin ===

{$modeswitch advancedrecords} // this needs to be after the $mode, but
before the uses section
type
  TTestObject = record
     i: integer;
      class operator = (const aLeft, aRight: TTestObject): Boolean;
  end;
  TTestObjectList = specialize TFPGList<TTestObject>;
// ...
class operator TTestObject.=(const aLeft, aRight: TTestObject): Boolean;
begin
  // whatever you need for equality
end;

=== code end ===

Regards,
Sven
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Thank you but I cant understand,can you explain more? This problem also happen for record but not classes. I am searching for easiest way to make list of records or objects.

Regards, Ara

"aradeonas" wrote

Thank you but I cant understand,can you explain more? This problem also happen for record but not classes. I am searching for easiest way to make list of records or objects.

Records and objects don't have an = operator defined, while for classes it is defined as pointer comparison.

Regards,
Sven
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Thank you very much. Its weird that I couldn't find any thing about this.

Regards, Ara

aradeonas wrote

Thank you very much. Its weird that I couldn't find any thing about this.

What exactly ?

Michael.

Specialize for object or record need operator definition. I really missed easy to use collections in Delphi.In this field I never could use it easy even everything goes well but still JCF will face to problem.

Regards,
Ara

Sven Barth wrote

TTestObject = record i: integer; class operator = (const aLeft, aRight: TTestObject): Boolean; end;

[rant]

And this is where I think the new "advanced records" in an abomination of the Object Pascal language. It's almost as if the following is now true:

advanced records = objects = class

"class operator" normally tells me it is related to a Class type (because of the "class" keyword), but in the above code it is a record type. But a record with methods, which is just unnecessary duplication of the Object data type.

Talk about messing with a beautiful "what used to be" clear language syntax. Just because Delphi deprecated the Object type, and then reinvented it by messing with the Record type - why did Free Pascal have to follow that mess.

Regards,
- Graeme -