Is it possible to write auto-cast operator outside a struct?

Question

The exact situation is next: I have defined in system API structs CGPoint and CGSize, and I want to be able to write my_point = my_size. I

Answer 1

When you assign a CGSize to a CGPoint - what happens? Distil that into some operator and there you have it - for example

CGPoint& operator|=(CGPoint& cPoint, CGSize const& cSize)
{
  // now set attributes of cPoint that you can extract from cSize

  return cPoint;
}

What's so difficult about this? Here is an example: http://www.ideone.com/FZN20