Boost serializing - adding armadillo matrices that have namespaces to a class - c++

Question

I have successfully serialized armadillo without a class matrices here:
#include <iostream>
#include <fstream>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
#include <armadillo>
#include <boost/serialization/split_member.hpp>
BOOST_SERIALIZATION_SPLIT_FREE(arma::mat)
namespace boost {
namespace serialization {
template<class Archive>
void save(Archive & ar, const arma::mat &t, unsigned int version)
{
ar & t.n_rows;
ar & t.n_cols;
const double *data = t.memptr();
for(int K=0; K<t.n_elem; ++K)
ar & data[K];
}
template<class Archive>
void load(Archive & ar, arma::mat &t, unsigned int version)
{
int rows, cols;
ar & rows;
ar & cols;
t.set_size(rows, cols);
double *data = t.memptr();
for(int K=0; K<t.n_elem; ++K)
ar & data[K];
}
}}
int main() {
arma::mat A = arma::randu<arma::mat>(4,5);
std::ofstream outputStream;
outputStream.open("bin.dat");
std::ostringstream oss;
boost::archive::binary_oarchive oa(outputStream);
oa & A;
outputStream.close();
arma::mat B;
std::ifstream inputStream;
inputStream.open("bin.dat", std::ifstream::in);
boost::archive::binary_iarchive ia(inputStream);
ia & B;
return 0;
}
But my end goal is to have arma matrices within a class, alongside typical data types (int, double, float, etc.) and be able to either serialize everything or specific data from the class. I also got it to work, that the normal data types could be serialized:
#include <iostream>
#include <fstream>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
#include <sstream>
#include <boost/serialization/split_member.hpp>
class Gear {
public:
template<typename Archive>
void serialize(Archive& ar, unsigned int version) { ar & v; }
void setV (const double& _v) { v = _v; }
double getV () { return v; }
void status () { std::cout << "v = " << v << std::endl; }
private:
double v;
};
class Car {
public:
template<typename Archive>
void serialize(Archive& ar, unsigned int version) {
ar & hp;
ar & x;
}
void setHP (const int& _hp) { hp = _hp; }
void setGear (Gear* _Gear) { x = _Gear; }
void status () { std::cout << "hp = " << hp << " Gear with v = " << x->getV() << std::endl; }
private:
int hp;
Gear *x;
};
int main() {
// Define new Gear:
Gear* g = new Gear();
g->setV(2.5);
g->status();
// Expectation is Car sets up the Gear.
Car c;
c.setHP(80);
c.setGear(g);
//c.status();
std::ofstream outputStream;
outputStream.open("bin.dat");
std::ostringstream oss;
boost::archive::binary_oarchive oa(outputStream);
oa & c;
outputStream.close();
Car b;
std::ifstream inputStream;
inputStream.open("bin.dat", std::ifstream::in);
boost::archive::binary_iarchive ia(inputStream);
ia & b;
b.status();
return 0;
}
So that works perfect, but I want to include the arma code (essentially) into the class. I tried to put the arma code within the class like such:
class Car {
public:
template<typename Archive>
void serialize(Archive& ar, unsigned int version) {
ar & hp;
ar & x;
}
namespace boost {
namespace serialization {
template<class Archive>
void save(Archive & ar, const arma::mat &t, unsigned int version)
{
ar & t.n_rows;
ar & t.n_cols;
const double *data = t.memptr();
for(int K=0; K<t.n_elem; ++K)
ar & data[K];
}
template<class Archive>
void load(Archive & ar, arma::mat &t, unsigned int version)
{
int rows, cols;
ar & rows;
ar & cols;
t.set_size(rows, cols);
double *data = t.memptr();
for(int K=0; K<t.n_elem; ++K)
ar & data[K];
}
} }
arma::mat A;// = arma::randu<arma::mat>(4,5);
void setHP (const int& _hp) { hp = _hp; }
void setGear (Gear* _Gear) { x = _Gear; }
void status () { std::cout << "hp = " << hp << " Gear with v = " << x->getV() << A<< std::endl; }
private:
int hp;
Gear *x;
};
And then in the int main():
Car c;
c.setHP(80);
c.setGear(g);
c.A = arma::randu<arma::mat>(4,5);
After trying to compile the attempt, I am getting the errors:
g++ -std=c++11 arma_serial_binary_versuch.cpp -larmadillo -lboost_serialization
arma_serial_binary_versuch.cpp:52:3: error: expected unqualified-id before ‘namespace’
namespace boost {
^
arma_serial_binary_versuch.cpp:121:1: error: expected ‘}’ at end of input
}
^
arma_serial_binary_versuch.cpp: In member function ‘void Car::serialize(Archive&, unsigned int)’:
arma_serial_binary_versuch.cpp:48:12: error: ‘hp’ was not declared in this scope
ar & hp;
^
arma_serial_binary_versuch.cpp:49:12: error: ‘x’ was not declared in this scope
ar & x;
^
arma_serial_binary_versuch.cpp: At global scope:
arma_serial_binary_versuch.cpp:50:5: error: expected unqualified-id at end of input
}
I've read that it's not possible to work with namespaces within a class but I am unsure of a workaround this. Anyone have any ideas/recommendations?