29.6. Arithmetic Operators

Just as with assignment, we can rely on conversion construction to make our task here very simple. First, we need to define the member composite assignment operators [Stro1997]:

Listing 29.4.

class UInteger64


{


  . . .


  UInteger64 &operator +=(UInteger64 const &rhs)


  {


    get_union_().i += rhs.get_union_().i;


    return *this;


  }


  UInteger64 &operator -=(UInteger64 const &rhs);


  UInteger64 &operator *=(UInteger64 const &rhs);


  UInteger64 &operator /=(UInteger64 const &rhs);


  UInteger64 &operator %=(UInteger64 const &rhs);


  UInteger64 &operator ^=(UInteger64 const &rhs);


  . . .

The binary operators are then provided as nonmember functions, implemented in terms of the public interface of the class:

UInteger64 operator +( UInteger64 const &lhs


                     , UInteger64 const &rhs)


{


  return UInteger64(lhs) += rhs;


}