#include <iostream>
#include <boost/cstdlib.hpp>
#include <boost/optional/optional.hpp>

struct A
{
   A(void) { std::cout << "A constructor (" << this << ')' << std::endl; }
   A(const A&) { std::cout << "A copy constructor (" << this << ')' << std::endl; }
   ~A(void) { std::cout << "A destructor (" << this << ')' << std::endl; }
};

int main(void)
{
   A a1;
   boost::optional<A> opt1(a1);
   boost::optional<A> opt2;

   std::cout << std::endl;
   opt2 = opt1;
   std::cout << std::endl;

   return boost::exit_success;
}