[
  uuid (87654329-4321-1234-4321-987654321CBA),
  version(1.0),
  endpoint ("ncacn_np:[\\pipe\\ccrpc2]")
]
interface calcline
{
  typedef struct
  {
    double real;
    double imag;
  } complex;

  void CalcLine([in] double left, 
	[in] double right,
	[in] double y, [in] long width,
	[out, size_is(width)] short line[]);
}