save/load file with vector of object using rapidjson c++

[mjudnauszy]

I am trying to make a simple "person" vector of objects which can be saved and then loaded from real file to vector of objects. I made a function found in some tutorials which returns all the content from class, but I have no clue what to do with it, to put it into a file. Should I use i/o stream operators or something? At now I have the following code:

#include <iostream> // person.h
#include <string>
#include <vector>
using namespace std;

#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"
using namespace rapidjson;

class person {
public:
std::string name;
string surname;
int age;
person();
~person();
person(string, string, int);


template <typename Writer>
void Serialize(Writer& writer) const {
writer.StartObject();
writer.String("name");
writer.String(name.c_str());
writer.String("surname");
writer.String(surname.c_str());
writer.String(("id"));
writer.Uint(age);
writer.EndObject();
}

std::string serialize(){
StringBuffer s;
Writer<StringBuffer> writer(s);
Serialize(writer);
return s.GetString();
}
};
#include "person.h" // person.cpp

person::person() {

}

person::~person() {

}

person::person(string name, string surname, int age) : name(name), surname(surname), age(age) {

}
#include "person.h" // main.cpp

int main() {

vector<person> Save;

person P1("Tak", "Nie", 20);
person P2("Yes", "No", 10);

Save.push_back(P1);
Save.push_back(P2);

cout << P1.serialize();
cout << P2.serialize();

return 0;
}