[fpc-pascal] Interface performance

[Ryan Joseph]

> On Nov 11, 2016, at 5:52 PM, Tony Whyman <tony.whyman at mccallumwhyman.com> wrote:
> 
> Someone else may correct me, but with CORBA, I believe you have to explicitly add a function to the interface such as
> 
> function GetObject: TMyObject;
> 
> and implement as
> 
> function TMyObject.GetObject: TMyObject;
> begin
>  Result := self;
> end;

I think I’m out of time now but I’ll try this in my code that was crashing before.

How is this different from just casting the interface to an object? There’s your example below basically like I was doing it before with the seemingly random crashes. Isn’t MyObject2 still pointing to MyObject1?

type
IMyInterface = interface
   procedure MyProc;
end;

TMyObjectClass = class(TInterfacedObject,IMyInterface)
public
  procedure MyProc;
end;

var MyObject1, MyObject2: TMyObjectClass;
     MyInterface: IMyInterface;

begin
 MyObject1 := TMyObjectClass.Create;
 MyInterface := MyObject1;

 MyInterface.MyProc;

 MyObject2 := TMyObjectClass(MyInterface);

 MyObject1.Free {OK for CORBA - will cause an exception in COM}
 {MyObject1, MyObject2 and MyInterface are now all invalid}
end;


Regards,
	Ryan Joseph