Re: [Boost-users] [serialization] serializing int*

Subject: Re: [Boost-users] [serialization] serializing int*
From: Johan Råde (rade_at_[hidden])
Date: 2008-09-22 06:56:17

jens weller wrote:
> Hello,
> 
> Simple example:
> 
> class A
> { int x; };
> class B
> { int *px; };
> 
> There exists a list of B for each A, which points to x.
> When now serializing B:
> 
> ar & px;
> 
> I get an compiletime error, that t is of non classtype 'int'.

...

> This error does not refer to the class it self, but it only occurs, when 
> serializing int* in my application.
> 
> Is this a bug? Or is this a thing serialization can't do right now?
> I've got a workaround, so I don't need to save the px variable, but I'd 
> like to know if this is an error or not.

 From the docs:

"By default, data types designated primitive by Implementation Level class serialization trait are 
never tracked. If it is desired to track a shared primitive object through a pointer (e.g. a long 
used as a reference count), It should be wrapped in a class/struct so that it is an identifiable 
type. The alternative of changing the implementation level of a long would affect all longs 
serialized in the whole program - probably not what one would intend. "

See
http://www.boost.org/doc/libs/1_36_0/libs/serialization/doc/special.html#objecttracking
for more details.

--Johan Råde