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

From: Noah Roberts (roberts.noah_at_[hidden])
Date: 2007-02-16 11:27:30

Matthias Schabel wrote:
>>> std::cout << ((x + y) * user_selected_unit) << std::endl;
> 
> How is this different from/better than
> 
> std::cout << quantity<your_system::psi>(x+y) << std::endl;
> 
> or, if you prefer,
> 
> typedef quantity<your_system::psi>	psi;
> 
> std::cout << psi(x+y) << std::endl;
> 
> ??

Well, like I said earlier, this solution requires a system for every 
possible unit you're using.  It also doesn't allow one to assign units 
since they are distinct types.  In order to create a runtime unit 
quantity in with your plan is to use something akin to boost::any to 
wrap any unit "type" into something that can be assigned to/from.

I started going that direction and realized quite quickly it's a big 
mess and there isn't much need for it except the desire to do everything 
in compile mode, which is unnecessary.