#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
//#include <boost/phoenix/core.hpp>
//#include <boost/phoenix/operator.hpp>
#include <cassert>

int i=0;
int a[] = {0};

template<class UnaryFunction>
inline void foo( UnaryFunction fun )
{
  fun(i);
}

int main()
{
  namespace bp = boost::phoenix;
  using namespace boost::phoenix::arg_names;

  (bp::ref(a)[arg1]++)(i);

  assert( a[0]==1 );
  
  foo( bp::ref(a)[arg1]++ );

  assert( a[0]==2 );  
}