boost serialization: intrusive and non-intrusive
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boost serialization
it has 2 modes: intrusive and non-intrusive
intrusive mode
class gps_position
{
public:
friend class boost::serialization::access;
// When the class Archive corresponds to an output archive, the
// & operator is defined similar to <<. Likewise, when the class Archive
// is a type of input archive the & operator is defined similar to >>.
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & degrees;
ar & minutes;
ar & seconds;
}
int degrees;
int minutes;
float seconds;
public:
gps_position(){};
gps_position(int d, int m, float s) :
degrees(d), minutes(m), seconds(s)
{}
};
non-intrusive mode
namespace boost {
namespace serialization {
template<class Archive>
void serialize(Archive & ar, gps_position & g, const unsigned int version)
{
ar & g.degrees;
ar & g.minutes;
ar & g.seconds;
}
} // namespace serialization
} // namespace boost
How does boost impl the 2 modes?
A: By function overloading. by parameter specialization
For intrusive mode, following template functions are called
boost::serialization::access::serialize<boost::archive::text_oarchive,gps_position>(boost::archive::text_oarchive & ar, gps_position & t, const unsigned int file_version);
Note non intrusive mode serialization‘s priority is always higher than intrusive mode as it is implemented in boost::serialization name space. and it is more "specific"
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