Re: [Boost-users] [Serialization] NVP and xml archives

19 Nov 2006


      Here is a little program which shows how you re-implement serialization of 
std::list<nvp<...
to your taste.  The code would only apply to these kinds of lists as only in 
this case would the template arguments match.  I've included different 
versions depending upon whether you want to apply the change to all archives 
or just xml archives.  I've compiled it on VC 7.1.  To actually run it, it 
would have to be enhanced somewhat to include serialization of the item 
count and maybe some other functionality of the current default 
implementation.

Robert Ramey

#include <list>
#include <fstream>
#include <boost/serialization/nvp.hpp>
#include <boost/serialization/utility.hpp>
#include <boost/archive/xml_oarchive.hpp>
#include <boost/archive/xml_iarchive.hpp>
namespace boost {
namespace serialization {
// replace default serialization for lists of nvp in ALL archives
template<class Archive, class U, class Allocator>
inline void serialize(
Archive & ar,
std::list<boost::serialization::nvp<U>, Allocator> & t,
const unsigned int version
){
// r
std::list<boost::serialization::nvp<U>, Allocator>::iterator itr = 
t.begin();
while(itr != t.end()){
ar & *itr;
itr++;
}
}
// OR
// replace default serialization for lists of nvp only in xml_archives
template<class U, class Allocator>
inline void serialize(
boost::archive::xml_oarchive & ar,
std::list<boost::serialization::nvp<U>, Allocator> & t,
const unsigned int version
){
std::list<boost::serialization::nvp<U>, Allocator>::iterator itr = 
t.begin();
while(itr != t.end()){
ar & *itr;
itr++;
}
}
template<class U, class Allocator>
inline void serialize(
boost::archive::xml_iarchive & ar,
std::list<boost::serialization::nvp<U>, Allocator> & t,
const unsigned int version
){
// r
std::list<boost::serialization::nvp<U>, Allocator>::iterator itr = 
t.begin();
while(itr != t.end()){
ar & *itr;
itr++;
}
}
} // serialization
} // boost
main(int arg, char *argv[]){
std::ofstream os("test");
boost::archive::xml_oarchive oa(os);
const std::list<boost::serialization::nvp<int> > l;
oa << BOOST_SERIALIZATION_NVP(l);
}