Re: [Boost-users] Serialization and null pointers

From: boost_at_[hidden]
Date: 2005-07-06 19:11:45

Robert,

Thanks for all your help, I really do appreciate it.  I was already 
serializing an stl vector, so you would think I would have thought of that! 
 heh.

Anyhow, I read through serialization/shared_ptr.hpp and sort of did the same 
thing on my custom shared pointer, and it is working great.

I especially liked this:

#define private public
#include <boost/shared_ptr.hpp>
#undef private

hehe

Thanks again!
-
Chris

----- Original Message -----
From: "Robert Ramey" <ramey_at_[hidden]>
To: boost-users_at_[hidden]
Date: Wed, 6 Jul 2005 14:48:51 -0700
Subject: Re: [Boost-users] Serialization and null pointers

> I suspect you didn't include <boost/serialization/shared_ptr.hpp> which
> includes serialization code for shared_ptr.  It also includes shared_ptr.hpp
> itself.  This is similar to the way the headers are organized for all the
> stl collections.  If you want to serialize the boost share_ptr be sure to
> read about in the docs as there are a few gotchas.  Also note that there the
> "real soon to be released" boost 1.33 has a different shared_ptr and
> different serialization of the same.
> 
> Good Luck.
> 
> Robert Ramey
> 
> boost_at_[hidden] wrote:
> > I was using my own home-grown one.  I wrote it before I started using
> > boost though.  I decided to try it out with boost::shared_ptr and
> > here is what I got:
> >
> > c:\Boost\boost_1_32_0\boost\serialization\access.hpp(106): error
> > C2039: 'serialize' : is not a member of 'boost::shared_ptr<T>'
> >
> >
> > I tried searching on boost shared_ptr serialize but came up empty.
> > Any suggestions?  Thanks.
> >
> > ----- Original Message -----
> > From: "Robert Ramey" <ramey_at_[hidden]>
> > To: boost-users_at_[hidden]
> > Date: Tue, 5 Jul 2005 20:18:00 -0700
> > Subject: Re: [Boost-users] Serialization and null pointers
> >
> >> boost_at_[hidden] wrote:
> >>> Thanks.  If I changed the order of the members being serialized it
> >>> worked fine.  Weird.
> >>>
> >>> However, I am running into a problem.  I am using reference counted
> >>> Smart Pointers.  If I serialize the reference counter, then when it
> >>> is loaded it will likely contain too large of a reference count
> >>> because there were more objects referencing the pointer when it was
> >>> saved than when it was loaded. However, it works fine it just
> >>> doesn't properly delete the objects because the reference count
> >>> never reaches 0.
> >>>
> >>> If I don't serialize the reference count then the objects try to
> >>> delete themselves while boost is loading them from the file.  I'm
> >>> guessing because of the order everything happens, the final
> >>> destination isn't increasing the reference count until after boost
> >>> already dereferences it.
> >>>
> >>> Any suggestions?
> >>
> >> I'm not sure which reference counted Smart Pointer you're using.  If
> >> you use the boost smart_ptr, its already has serializaiton done.  If
> >> you want to add serialization to your own Smart Pointer, you can
> >> look at how it was done for the boost smart pointer - now there are
> >> two versions so you have lots of ideas available.
> >>
> >> Robert Ramey
> >>
> >>
> >>
> >> _______________________________________________
> >> Boost-users mailing list
> >> Boost-users_at_[hidden]
> >> http://lists.boost.org/mailman/listinfo.cgi/boost-users
> 
> 
> 
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