Re: [boost] mcs::units informal review request

From: Peder Holt (peder.holt_at_[hidden])
Date: 2007-01-15 03:20:30

<snip>

>
> and the FPType default to double?  (Since nearly all work will be done using double, it would be nice to avoid typing/seeing double
> so often in the code.  It would be much nicer to write
>
>     quantity<length>    L = 2.0 * meters;  // quantity of length
>
> to get double?
>
>     quantity<float, length>     L = 2.0 * meters;  // quantity of length
>
> to get float, but order makes this impossible.

Not impossible, just add another layer of indirection:

template<typename T1,typename T2>
class quantity : public quantity_impl<
   typename mpl::if_<
      is_unit<T1>,T2,T1
   >::type,
   typename mpl::if_<
      is_unit<T1>,T1,T2
   >::type
> {};

Peder