Re: [Boost-users] [Serialization] [Serialization of stl map withpointer to POD type]

31 Dec 2008


      Anytime you're serialization a "const" value its a red flag that
you might really want to do that. "const" values are
initialized when the object is created and should never
subsequently change.

anyway, try:

save ..
ar << data.count();.
for (iter = data_.begin(); iter != data_.end(); iter++) {
    std::string key(iter->first);
    ar << key;
    ar << iter->second;
}

load ...
_data.clear()
ar >> count;
while(0 < count){
    std::string key;
    int i;
    ar >> key;
    ar >> i;
    data_.insert(
        key.cstr(),  // of course this won't work - but you get the idea
        i
    );
}

Robert Ramey

Denis Gabaidulin wrote:
...
I have following class with stl container:
class storage : {
private:
  map data_;
friend class boost::serialization::access;
template<class Archive>
   void save(Archive & ar, const unsigned int version) const
   {
       map local;
       constDataIter iter;
for (iter = data_.begin(); iter != data_.end(); iter++) {
          local[iter->first] = iter->second;
       }
ar & local;
   }
}
This code works, but it slowly(full copy) and consume too much memory
(x2) :-(
What is the best serialization strategy with such stl containers or
pointer to pod type?
I cannot change const char* to string, dont ask me why :-))
Thanks you for any advice.