Re: [Quantlib-dev] SmileSection

[Luigi B. <lui...@gm...>]

On Tue, 2009-10-20 at 16:06 +0200, Ferdinando Ametrano wrote:
> On Tue, Oct 20, 2009 at 3:25 PM, Luigi Ballabio
> <lui...@gm...> wrote:
> > Oh---and also smileSection->volatility(Null<Real>()) returning the ATM
> > volatility [*], when there's a perfectly serviceable atmLevel method
> > that can be used for writing volatility(atmLevel()).
> 
> The point here is:
> 1) to have the interface gracefully degrade to the flat-smile case
> 2) the traders I work for claim it's too much effort to specify a
> strike even for non-flat smile, since unless differently specified,
> volatility tout-court is the atm one

Well, I'm a lazy Italian myself, but in this case I'd go for clarity :)


> > why is exerciseTime() public when it's only used internally?
> no strong reason beside he fact that all termstructures' interfaces
> are also time based so it might be sensible for a smile to know where
> it stands along the time dimension

Point taken.  It stays public then.

On the other hand, initializeExerciseTime should be protected, right?

Luigi


-- 

Glendower: I can call spirits from the vasty deep. 
Hotspur: Why, so can I, or so can any man; 
But will they come when you do call for them? 
-- King Henry the Fourth Part I, Act III, Scene I