[boost] Re: Serializaiton:accessing a private constructor

From: Robert Ramey (ramey_at_[hidden])
Date: 2003-10-13 13:58:45

David Abrahams wrote:

>What if there's just no default constructor, private or otherwise?

Currently you would have to overload:

template<class Archive, class T>
void load(Archive &ar, T * &t, unsigned int version)
...

for the specifice collection with something like

template<class Archive>
void load(Archive &ar, vector<A> &va, unsigned int version){
        unsigned int size;
        va.clear();
        ar >> size;
        while(size-- > 0){
                int i;
                ar >> i;
                A a(i);
                ar >> a;
                va.pushback(a);
        }
}

That is the current default implementation of collection serializaton presumes
the existence of a default constructor for the element.  If this isn't true
then the default implementation won't work and you'll have to make your
own override.

Robert Ramey