Re: [Boost-users] serialization of derived classes...

From: Robert Ramey (ramey_at_[hidden])
Date: 2005-07-07 13:20:08

There is a section of the manual which describes the issues related to
serialization of derived pointers through a pointer to he the base class.

When serializing pointers, its very easy to create memory leaks.  The
loading of pointers creates new objects.  If the data structures are such
that these objects have no owner, you'll probably get leaks.  To my dismay,
I found that lots of my tests have leaks that I had overlooked before the
test system started to check for them.  They don't affect the tests
themselves but the lesson is pretty clear.  Look into using shared_ptr when
classes contain pointers.

Robert Ramey

Filip Peters wrote:
> Hi list,
>
> I'm using the boost::serialization lib to archive
> classes in a VC7.1 program.
> I have a class C, derived from B, derived from
> (abstract) A
>
> now, in serialisation of C, I did:
> ar &  boost::serialization::make_nvp( "baseobject",
> boost::serialization::base_object<B>( t ) );
>
> This seems to give a memory leak on closing the
> application.
>
> So I tried the following 2 lines:
> ar &  boost::serialization::make_nvp( "baseobject",
> boost::serialization::base_object<A>( t ) );
> ar &  boost::serialization::make_nvp( "baseobject2",
> boost::serialization::base_object<B>( t ) );
>
> and this seemed to work....
>
> What is the correct way of saving C (derived from  B
> which is derived from A)?
> It seems a bit strange to me that i have to call
> serialization of A in the ser. of C. Shouldn't B take
> care of this?
>
> thanks,
> Filip Peters
>
>
>
>
>
>
>
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