I forgot: FreePascal 3.3.1 r.40507
V.
______________________________________________________________
Od: "Vojtěch Čihák" <vojtech.ci...@atlas.cz>
Komu: "FPC-Pascal users discussions" <fpc-pascal@lists.freepascal.org>
Datum: 11.12.2018 22:19
Předmět: [fpc-pascal] Generic (TFPGObjectList) EInvalidCast
Hi,
why this code gives EInvalidCast at runtime (but compiles well):w
program Project1;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Classes, fgl
{ you can add units after this };
{$R *.res}
type
TMyClass = class
procedure Output1;
end;
TMyList = class (specialize TFPGObjectList<TMyClass>)
end;
TMyDescClass = class(TMyClass)
procedure Output2;
end;
var MyList: TMyList;
MyClass: TMyClass;
procedure TMyClass.Output1;
begin
WriteLn('Output1');
end;
procedure TMyDescClass.Output2;
begin
WriteLn('Output2');
end;
begin
MyList:=TMyList.Create(True);
MyClass:=TMyClass.Create;
MyList.Add(MyClass);
MyList[0].Output1;
TMyDescClass(MyList[0]); // EInvalidCast
MyList.Free;
end.
Thanks for help,
V.
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