#include <iostream>
#include "boost/python/class_builder.hpp"

using namespace boost::python;

struct Expression { Expression() {} };

struct Term 
{
    Term() {}
    Term(const Expression&) {}
};

void f(const Term& t) {}

struct A { A(const Term&) {} };

BOOST_PYTHON_BEGIN_CONVERSION_NAMESPACE

PyObject* to_python(const Expression& e)
{
  return to_python(Term(e));
}

BOOST_PYTHON_END_CONVERSION_NAMESPACE

BOOST_PYTHON_MODULE_INIT(convert)
{
  try
  {
    
  module_builder convert("convert");

  class_builder<Term> Term_(convert, "Term");
  Term_.def(constructor<>());
  Term_.def(constructor<const Expression&>());
  
  class_builder<Expression> Expression_(convert, "Expression");
  Expression_.def(constructor<>());

  convert.def(f , "f");

  class_builder<A> A_(convert, "A");
  A_.def(constructor<const Term&>());
  }
  catch(...)
  {
  }  
}