#include <iostream>
#include <boost/shared_ptr.hpp>

struct Foo
{
  Foo() { std::cout << "Foo constructor" << std::endl; }
  ~Foo() { std::cout << "Foo destructor" << std::endl; }
  int x;
};

void bar(Foo& f) { std::cout << f.x << std::endl; }

int main(int argc, char** argv) try
{
  boost::shared_ptr<Foo> ptr(new Foo);

  if ( ptr )
  {
    std::cout << "test the boolean context" << std::endl;
  }

  ptr->x = 1024;
  // std::cout << "test the arrow operator" << std::endl;

  bar(*ptr);
  // std::cout << "test the dereference operator" << std::endl;

  std::cout << "use_count " << ptr.use_count() << std::endl;

  {
    boost::shared_ptr<Foo> ptr2 = ptr;
    boost::shared_ptr<Foo> ptr3 = ptr;
    std::cout << "use_count " << ptr.use_count() << std::endl;
  }

  std::cout << "use_count " << ptr.use_count() << std::endl;

  return 0;
}
catch (std::bad_alloc e)
{
  std::cerr << "memory allocation failure in main\n";
  return 1;
}