Re: [boost] operators.hpp and size bloat

From: Aleksey Gurtovoy (alexy_at_[hidden])
Date: 2000-06-14 17:12:17

Mark Rodgers <mark.rodgers_at_[hidden]> wrote:
> So then I just restored the original simple operators.hpp and
> wrote
>
>     class myclass // lose the inheritance...
>     {
>         //...
>     };
>     // explicitly instantiate the operators I need.
>     template class less_than_comparable<myclass>;
>     template class equality_comparable<myclass>;
>     template class incrementable<myclass>;
>     template class decrementable<myclass>;
>     template class addable<myclass,long>;
>     template class subtractable<myclass,long>;
>
> Now everything is less complex, and I've got sizeof(myclass) back
> to 4 without relying on any compiler optimisations.
>
> Comments?

It's a nice approach! (in cases when it's applicable). I agree with Dave
that it must be described in the documentation.
One more situation when you still need the inheritance approach is when you
write a class template like boost::geometry2d::point:

template<class T1, class T2 = T1>
class point
  : addable< point<T1, T2>
  , subtractable< point<T1, T2>
  > >
{
//...
};

--Alexy