[boost] Re: physical-quantities

From: Deane Yang (deane_yang_at_[hidden])
Date: 2004-01-08 18:04:01

Jan Langer wrote:
> 
> the problem is not the assignment, but the other operators. for example 
> addition, what is correct the first or the last form?
> 
>     template <typename Unit1, typename Unit2>
>     Unit1 operator + (Unit1 u1, Unit2 u2)
>     {
>         Unit1 t;
>         convert (t, u2);
>         return u1 + t;
>     }
> 
>     template <typename Unit1, typename Unit2>
>     Unit2 operator + (Unit1 u1, Unit2 u2)
>     {
>         Unit2 t;
>         convert (t, u1);
>         return t + u2;
>     }
> 

The point is to allow neither and force an explicit conversion,
before doing the operation.
> jan
>