Re: [boost] Interest in boost.deepcopy [SEC=UNCLASSIFIED]

Subject: Re: [boost] Interest in boost.deepcopy [SEC=UNCLASSIFIED]
From: Levy, Gabriel (Contractor) (Gabriel.Levy_at_[hidden])
Date: 2011-10-24 22:51:28

UNCLASSIFIED

Definitely it sounds a very worthwhile addition to me.
Given that it does follow some proven patterns/concepts as in
boost::serialize (for instance), it should take away a lot of guesses
out of how it should/would work.
I'd love to see it added, pls...

Gabe Levy
Senior Software Engineer, HiQ Systems Pty Ltd WSD, 201L, Edinburgh, SA

> -----Original Message-----
> From: boost-bounces_at_[hidden]
> [mailto:boost-bounces_at_[hidden]]
> On Behalf Of Allan Johns
> Sent: Tuesday, 25 October 2011 1:15 PM
> To: boost_at_[hidden]
> Subject: Re: [boost] Interest in boost.deepcopy
> 
> On Tue, Oct 25, 2011 at 1:29 PM, Julien Nitard
> <julien.nitard_at_[hidden]>wrote:
> 
> > Hi,
> >
> > > Consider an object hierarchy in which there may be multiple 
> > > references
> to
> > > shared objects. A deep copy should give an identical, but entirely
> > separate
> > > copy of the entire structure.
> > >  Also consider eg std::map<std::string,T*>... the std::map copy
> > constructor
> > > is not going to create new instances of T in the copy - this is a
> shallow
> > > copy.
> > >
> > If I understand properly, when you encounter a pointer you duplicate

> > the object pointed to. Is that right ?
> 
> 
> Often but not always. Sometimes a type will want specific behaviour, 
> such as sharing an internal reference with the original object because

> there is some COW pattern implemented.
> 
> 
> > Does it work properly if (in your example
> > above) T is a polymorphic class ? If yes, how ?
> >
> >
> Yes, and in the same way boost.serialize works... each polymorphic 
> class is registered beforehand.
> 
> 
> >
> > Regards,
> >
> > Julien
> >
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