Re: [Boost-users] [serialization] Stop tracking a specific item

Subject: Re: [Boost-users] [serialization] Stop tracking a specific item
From: Robert Ramey (ramey_at_[hidden])
Date: 2009-08-25 18:11:09

the only way that I can think of to do this is to:

Let T be "the type you want to serialize"

a) set tracking of the T to "track_never"
b) make a "wrapper" tracked<T> used the default tracking.

BOOST_CLASS_TRACKING(T, track_never)

use

ar & tracked(t); // for the tracked version

and

ar & t; for the untracked version.

Look into the documentation regarding wrappers and
the nvp as an example on this.

Robert Ramey

Chard wrote:
> I have no access to the default constructor of a type I want to
> serialize (and no knowledge of any other constructors).  However, the
> type is a friend to boost::serialization::access.
>
> Rather than duplicating a chunk of the serialization code, I thought
> I could just reuse the guts of it by serializing the object through a
> pointer.
> However, this would require me to construct the pointer during the
> serialization process, which would mess up the object tracking.  Is it
> possible to turn the tracking off for a specific serialized object,
> but not the whole type ?
>
> E.g. a contrived example:
>
> template ...
> void serialize(Archive &ar, const unsigned)
> {
>  Type *p = 0;
>
>  if (Archive::is_saving::value)
>  {
>    p = FuncThatCanGiveMeAPointerToType();
>  }
>
>  // Want to turn off object tracking on p here
>  ar & p;
>  // or remove it here
>
>  if (Archive::is_loading::value)
>  {
>    FuncThatCanAssignTypeByValue(*p);
>    delete p;
>  }
> }
>
> It's like I require a remove_object_address, as opposed to
> reset_object_address.
>
> Or is there an alternative approach?