Re: [Boost-users] [units] Creating specific unit quantities

Subject: Re: [Boost-users] [units] Creating specific unit quantities
From: Matthias Schabel (boost_at_[hidden])
Date: 2011-03-03 14:38:01

> On Thu, Mar 3, 2011 at 12:02 PM, Matthias Schabel <boost_at_[hidden]> wrote:
> I don't really understand what you're trying to accomplish.
>  
> I'm trying to add two quantities together.  One quantity was created using the si system and the other was created directly.
>  

Maybe http://www.boost.org/doc/libs/1_46_0/doc/html/boost_units/Quantities.html#boost_units.Quantities.Quantity_Construction_and_Conversion?

>  
> I thought what this meant was a quantity value was being creating with the si::length dimension.  The unit of measurement for si::length is the meter and therefore the value 2.0 is being stored as 2.0 meters.  I thought this was confirmed when the display of the quantity value showed "2 m".  If this isn't what is occurring could you shed some light on this?

quantity<si::length> is shorthand for quantity<si::length,double>. si::length is type representing a length in the SI system, so it encapsulates both the dimensionality of length and the specific measure of length.