Re: [Boost-users] [serialization] free load/save

From: Robert Ramey (ramey_at_[hidden])
Date: 2007-03-31 20:37:41

Ruediger Berlich wrote:
> Dear all,
>
> I'd like to serialize a number of classes using the free-standing
> version of the serialize function. As I do not want to access
> internals of the classes directly, I have to work with set/get
> functions, which in turn implies having to write load/save functions.
>
> This seems to work for simple types, like in the following example.
> But will it circumvent any internal mechanisms of Boost.Serialization
> , if I do not give the library direct access to class data ? Will
> this work for complex types, e.g. vectors of shared_ptr objects ?

yes

The only problem will be with "secret" objects which are pointed to.

When you de-serialize them to the stack, the internal address is wrong
so after moving them using "get" you'll have to use "reset_object_address"
if they are trackable.

Robert Ramey

>
> /*************************************************************************/
>
> class base{
> public:
>    base(void){
>        setSecret(1);
>    }
>    base(int val){
>        setSecret(val);
>    }
>    virtual ~base(){ /* nothing */ }
>
>    virtual int getSecret(void) const{
>        return secret;
>    }
>
>    virtual void printInfo(void) = 0;
>
>    void setSecret(int val){
>        secret = val;
>    }
>
> private:
>    int secret;
> };
>
> BOOST_IS_ABSTRACT(base);
>
> namespace boost {
>    namespace serialization {
>        template<class Archive>
>        void save(Archive & ar, const base & t,
>                  unsigned int version)
>        {
>            int secret = t.getSecret();
>            ar & make_nvp("secret", secret);
>        }
>
>        template<class Archive>
>        void load(Archive & ar, base & t, unsigned int version)
>        {
>            int secret;
>            ar & make_nvp("secret", secret);
>            t.setSecret(secret);
>        }
>
>        template<class Archive>
>        inline void serialize(Archive & ar, base & t;
>                              const unsigned int version)
>        {
>            split_free(ar, t, version);
>        }
>    }
> }
>
> /*************************************************************************/
>
> Thanks and have a good day,
> Ruediger