code: private String createString(String f)
      {
          return
              "srcArray="+srcArray+f+
              "srcPos="+srcPos+f+
              "srcPtr="+srcPtr+f+
              "dstArray="+dstArray+f+
              "dstPos="+dstPos+f+
              "dstPtr="+dstPtr+f+
              "extent="+extent+f+
              "kind="+cudaMemcpyKind.stringFor(kind);
      }
docs: Creates and returns a string representation of this object,
  using the given separator for the fields
  
  @return A String representation of this object