[boost] Re: Archive * This() and the most derived class.

From: George M. Garner Jr. (gmgarner_at_[hidden])
Date: 2005-04-12 08:14:29

Robert,

Sorry, I just saw your other comment about not deriving from 
boost::archive::xml_woarchive.  :-)
If only all problems were resolved so easily.

Regards,

George.

"George M. Garner Jr." <gmgarner_at_[hidden]> escreveu na mensagem 
news:d3gg2n$h3e$1_at_sea.gmane.org...
> Robert,
>
> A comment in interface_oarchive.hpp states that 
> interface_oarchive<Archive>::This() is supposed to return the a pointer to 
> the most derived class.  Actually, it gives you a pointer to the "Archive" 
> template parameter which may or may not be the most derived class, 
> depending on how your internal "invoke" plumbing resolves the type.  In 
> the following case I was able to get the most derived class only by 
> overriding both operator<<(const T & t) and save_override()(using VC2k3):
>
> class fau_xml_woarchive :
> public boost::archive::xml_woarchive
> {
> public:
>    [...]
>    template<class T>
>    void save_override(const ::boost::serialization::nvp<T> & t, int i)
>    {
>        save_start(t.name());
>        boost::archive::save(*this, t.value());
>        save_end(t.name());
>    }
>    template<class T>
>    _Mytype& operator<<(const T & t)
>    {
>        save_override(t, 0);
>        return *this;
>    }
>    [...]
> };
>
> Was that your intention?
>
> Regards,
>
> George.
>
>
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