Can I build a bidirectional coroutine with Boost 1.55?

The current Boost 1.55 implementation offers two kinds of unidirectional coroutines. One is a pull-type, which is a coroutine that takes no parameters and returns a value to the main context; the other is the push-type, which is a coroutine that accepts a parameter from the main context but returns no value.

How can I combine these two to create a bidirectional coroutine that both accepts a parameter and returns a value? On the surface it seems like it should be possible, but I can't quite figure out how to do it with the building blocks I have in boost::coroutine. There used to be a bidirectional coroutine in older Boosts, but it is now deprecated and undocumented, so I shouldn't rely on it.

ie, I would like something analogous to this:

void accumulate( pull_func &in, push_func &out )
{
  int x = 0;
  while ( in ) 
  {
    x += in.get() ; // transfers control from main context 
    out(x); // yields control to main context
  }
}

void caller( int n ) 
{
   bidirectional_coro( accumulate );
   for ( int i = 0 ; i < n ; ++i )
   {
      int y = accumulate(i); 
      printf( "%d ", y ); // "0 1 3 6 10" etc
   }
}