template <typename Tag> struct IntPair{
  int x, y;
 
  IntPair& operator=(IntPair rhs){
    x = rhs.x; y = rhs.y;
    return *this;
  }
 
  template <typename Other>
  IntPair& operator+=(const IntPair<Other>& rhs){ x += rhs.x; y += rhs.y; return *this; }
 
  template <typename Other>
  const IntPair operator+(const IntPair<Other>& rhs) const { IntPair<Tag> result = *this; return result += rhs; }
};
 
typedef IntPair<struct TagPosi> Position;
typedef IntPair<struct TagSize> Size;
 
int main(){ 
  Size size = {10,10};
  Position pos = { 5, 5};
  pos += size;
}

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