Re: [Boost-users] Serialization of a complex data structure

Subject: Re: [Boost-users] Serialization of a complex data structure
From: Marco Meoni - Sbaush (sbaush_at_[hidden])
Date: 2010-05-10 09:53:34

Hi all.
I understood how to serialize correctly nested structures, defining
serialize method inside all.

I've a problem with an attribute of a struct. The attribute is border of
OpenCV CvSeq type.

Here is my code... what can i do to solve this?

struct Element{
unsigned int id;
double area;
double perimeter;
CvRect bounding_box;
CvSeq* border;
...
        ...
};

namespace boost {
namespace serialization {

template<class Archive>
void serialize(Archive & ar, Element & g, const unsigned int version)
{
ar & g.id;
ar & g.area ;
ar & g.perimeter ;
        ar & g.bounding_box.width ;
ar & g.bounding_box.height ;
ar & g.bounding_box.x ;
ar & g.bounding_box.y ;
        // ar & g.border; I CAN'T DO THIS...

}
}
}

The error that I obtain
is: c:\boost\boost_1_42\boost\serialization\access.hpp(118) : error C2039:
'serialize' : is not a member of 'CvSeq'
        c:\opencv2.0\include\opencv\cxtypes.h(1240) : see declaration of
'CvSeq'

For CvRect bouding:box i overcame the problem serializing the sub-elements
of CvRect.

thanks for help.

Marco.

On Mon, May 3, 2010 at 3:39 PM, Marco Meoni - Sbaush <sbaush_at_[hidden]>wrote:

> I don't know if I understood correctly but I understood that the key
> function of vector serialization is split_free. I did not understand how to
> use this technique in the case of my example. Can you help me understand the
> workings of the vector serialization so as to know how to extend it to
> classes? What can i read to understand how to solve?
>
> Thanks...
>
> Marco.
>
> On Fri, Apr 30, 2010 at 6:08 PM, Robert Ramey <ramey_at_[hidden]> wrote:
>
>>  Try looking inside boost/serialization/vector.hpp to see how it was done
>> for the STL containers.
>>
>> Robert Ramey
>>
>> Marco Meoni - Sbaush wrote:
>> > Yes.
>> > I did an example like this to learn how to serialize in the
>> > "classical" way.
>> >
>> >
>> > My problem is that i can't define a serialize method inside
>> > Container, but i would serialize it anyway. How can i serialize the
>> > Example strut entirely?
>> >
>> >
>> > Do you understand my problem?
>> >
>> >
>> > On Fri, Apr 30, 2010 at 3:49 AM, Robert Ramey <ramey_at_[hidden]> wrote:
>> >
>> > Marco Meoni - Sbaush wrote:
>> >> Can someone help me?
>> >> Robert, where can I find what you're talking about?
>> >
>> > I don't know what you're trying to do so I'll take a guess.
>> >
>> > Does this look like what you want to do?
>> >
>> > struct Container {
>> >     int m_container_member;
>> >     ... // more members
>> >     template<class Archive>
>> >     void serialize(Archive & ar, const unsigned int version){
>> >         ar & m_container_member;
>> >         ... // more members
>> >     }
>> > };
>> >
>> > struct Example {
>> >     friend class boost::serialization::access; // not really
>> > necessary as all "struct" members are public
>> >     template<class Archive>
>> >     void serialize(Archive & ar, const unsigned int version){
>> >         ar & m_container;
>> >     }
>> > };
>> >
>> > int main(int argc, char * argv[]){
>> >     const Container c = ...
>> >     std::fostream os("filename");
>> >     boost::serialization::archive ar(os);
>> >     ar & c;
>> > }
>> >
>> > Does that help any?
>> >
>> > Robert Ramey
>> >
>> >
>> > _______________________________________________
>> > Boost-users mailing list
>> > Boost-users_at_[hidden]
>> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
>>
>> _______________________________________________
>> Boost-users mailing list
>> Boost-users_at_[hidden]
>> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>>
>
>
>
> --
> Marco Meoni - Sbaush
> www.marcomeoni.net
>

-- 
Marco Meoni - Sbaush
www.marcomeoni.net