From: Jeffrey Holle (jeffreyholle_at_[hidden])
Date: 2006-02-22 11:35:07
boost::serialization considers std::string a primative type.
This means it causes problems sometimes when polymorphim or pointers are used.
The solution is to make a wrapper around the string, something like:
class tracked_string {
public:
tracked_string() {}
tracked_string(const std::string& src) {
m_string = src;
}
tracked_string(const tracked_string& src) :
m_string(src) {}
template<class Archive>
void serialize(Archive &ar, unsigned int version) {
ar & m_string;
}
// casting operators
operator std::string() const {
return m_string;
}
operator std::string() {
return m_string;
}
private:
std::string m_string; // the real data
};
Michael Sperber wrote:
> Hi there,
>
> I'm trying to convert a piece of code from templated archives to
> polymorphic ones, and am running into trouble when serializing
> std::string. Either I get an error message saying that std::string
> has no serialize member function, or I get the attached message.
>
> The relevant code is this:
>
> ---snip---
> #include <boost/serialization/serialization.hpp>
>
> #include <boost/archive/polymorphic_iarchive.hpp>
> #include <boost/archive/polymorphic_oarchive.hpp>
>
> void
> mtime::serialize(boost::archive::polymorphic_iarchive& ar,
> const unsigned int file_version)
> {
> std::string iso;
> ar & boost::serialization::make_nvp("iso_time", iso);
> set_from_iso_string(iso);
> }
>
> void
> mtime::serialize(boost::archive::polymorphic_oarchive& ar,
> const unsigned int file_version)
> {
> std::string iso =3D to_iso_string();
> ar & boost::serialization::make_nvp("iso_time", iso);
> }
> ---snip---
>
> Am I missing something obvious? Are certain types not directly
> supported for serialization via polymorphic archives? Any help would
> be much appreciated.