[Cppcms-users] Serialization usage

[CN <cn...@fa...>]

I feel this code has little difference from the bundled example, but it
yields garbage. Any idea why?
----------------------
#include <cppcms/serialization.h>
#include <cppcms/application.h>
#include <cppcms/cache_interface.h>
#include <cppcms/session_interface.h>
#include <iostream>
struct person
{
	std::string id;
	std::string name;
	std::string address;
};

struct serializable_person : public cppcms::serializable
{
	person p;
	void serialize(cppcms::archive &a){
        a & cppcms::as_pod(p);
    }
};

struct serializable_v : public cppcms::serializable
{
	std::vector<serializable_person> many;
	void serialize(cppcms::archive &a){
		a & many;
	}
};

int main(int argc,char **argv)
{
	serializable_v obj;

	obj.many.push_back(serializable_person());
	person &p=obj.many.back().p;
	p.id="1"; p.name="John"; p.address="here";

	obj.many.push_back(serializable_person());
	person &p1=obj.many.back().p;
	p1.id="1"; p1.name="John"; p1.address="here";

	cppcms::archive a;
	obj.save(a);
	std::cout << a.str(); //garbage
	return 0;
}

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