c++ static 관련 ..

#include <stdio.h>
 
class Clerk	{
public:
	Clerk();
	int num;
};
 
class Manager {
public:
	Manager(int id=8989);
	static Manager* instance();
 
	int num;
	Clerk clerk;
}; 
 
Manager::Manager(int id)
{
	num = id;
}
 
Manager* Manager::instance()
{
	printf("instance\n");
	static Manager man;
	return &man;
}
 
Clerk::Clerk()
{
	num = Manager::instance()->num;
}
 
int main(int argc, char* argv[])
{
	Manager* pMan = Manager::instance();
	printf("Hello World!\n");
	return 0;
}