#include <boost/detail/lightweight_test.hpp>
#include <boost/functional/factory.hpp>
#include <boost/functional/forward_adapter.hpp>

class sum 
{
  int val_sum;
public:
  sum(int a, int b) : val_sum(a + b) { }

  operator int() const { return this->val_sum; }
};
  template
  < class Source
  >
  struct
factory_fwd
: boost::forward_adapter<boost::factory<Source> >
{
    factory_fwd(void)
    : boost::forward_adapter<boost::factory<Source> >(boost::factory<Source>())
    {}
};
int main()
{
#define one 1
#define two 2
    {
      sum* instance( factory_fwd< sum* >()(one,two) );
      BOOST_TEST(*instance == 3);
    }
    return boost::report_errors();
}