[fpc-pascal] Generic TFPGList<Record Type> gives me compiler error: Operator is not overloaded

[Sven Barth]

On 17.09.2013 14:52, Dennis Poon wrote:
> I have this:
> uses fgl;
>
> Type
>    RScene=record
>      ID : Word;
>      Name, Category : String;
>    end;
>
>    TSceneList=specialize TFPGList<RScene>;
>
>
> The error is:  Operator is not overloaded: "RScene" = "RScene"
>
>
> I suppose the generic thing does not know how to compare 2 records.
> How do I solve that?

Provide a "=" operator overload for the record:

=== code begin ===

uses fgl;

{$modeswitch advanced_records}

Type
    RScene=record
      ID : Word;
      Name, Category : String;
      class operator = (aLeft, aRight: RScene): Boolean;
    end;

    TSceneList=specialize TFPGList<RScene>;

class operator RScene.=(aLeft, aRight: RScene): Boolean;
begin
   ...
end;

=== code end ===

Regards,
Sven