Re: [Quantlib-dev] Handle class conversion. Open discussion.

[Simon I. <Sim...@fs...>]

Hi Kakhkhor,

I created some dynamic_handle_cast code about 2 years ago. There was
some discussion at the time: see 28th Feb 2008

http://osdir.com/ml/finance.quantlib.devel/2008-02/

I submitted an implementation but had no response - and it hasn't made
its way into the library. I can provide it again if required.

Simon

-----Original Message-----
From: Kakhkhor Abdijalilov [mailto:kab...@gm...] 
Sent: 24 December 2010 23:39
To: qua...@li...
Subject: [Quantlib-dev] Handle class conversion. Open discussion.

Dear all,
Current implementation of Handle class doesn't permit conversion from
Handle<Derived> to Handle<Base>. If we supply Handle<Base> with
converting constructor, an instance of Handle<Derived> could be
substituted where an instance of Handle<Base> is expected. For
example, an instance of Handle<SimpleQuote> could be passed  to term
structure constructors instead of Handle<Quote> instance. This
conversion makes sense, since SimpleQuote is a subtype of Quote.

Enabling conversion would allow user code use derived class features
without a need for dynamic casting. Safety of conversion can be
checked at runtime, similar to pointer down-casting.

I did some coding in this direction and so far everything looks OK.
Since it is a design decision and not a bug fix, I wanted to know what
other think before submitting my code.

Regards,
Kakhkhor Abdijalilov.

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