Boost.units ported to D

[David]

> And finally, there is the function convert (line 3666).  It needs some
> cleanup, but this is the function used to explicitly convert from a
> quantity to another.  I haven't decided on the actual syntax yet, but in
> Boost.units casting is used (e.g., quantity<cgs::length> L1 =
> static_cast<quantity<cgs::length> >(L2)).  Any ideas?

You could make: to!unit(12) possible (to from std.conv)