Question

TBase = class(TObject)
...

TDerived = class(Tbase)
...

if myObject is TBase then ...

can I code this somehow and have it return false if myObject is of class TDerived?

Answer 1

If you need exact class type check use ClassType method:

type

TBase = class(TObject)
end;

TDerived = class(Tbase)
end;

procedure TForm1.Button1Click(Sender: TObject);
var
 A: TBase;

begin
  A:= TBase.Create;
  if A.ClassType = TBase then ShowMessage('TBase');  // shown
  A.Free;
  A:= TDerived.Create;
  if A.ClassType = TBase then ShowMessage('TBase again'); // not shown
  A.Free;
end;