Object coercion flow in C++

objectcoercion.cpp

#include <iostream>

class B; 

class A
{
public:
  A ()
  { std::cout << "A::A ()" << std::endl; }

  operator B ();

  B f () const;
};


class B
{
public:
  B ()
  { std::cout << "B::B ()" << std::endl; }

  B& operator= (B const b)
  {  
    std::cout << "B& operator= (B const b)" << std::endl;
    return *this;
  }
  
  B (A const& a)
  {
    std::cout << "B::B(A const&)" << std::endl;
  }
};

A::operator B ()
{  
  std::cout << "A::operator B ()" << std::endl << "\t";
  return B ();
}

B A::f () const
{ return A (); }



int main ()
{
  B b; // B::B ()
  A a; // A::A ()
  b = a.f(); // A::A ()
             // A::operator B()
             // B::B ()
             // B& operator= (B const b)

  return 0;
}