Re: [Units] Incorrect definitions for torque, newton_meter

From: Frank Mori Hess (fmh6jj_at_[hidden])
Date: 2022-08-29 13:50:29

I don't know anything about boost.units, but radians are
dimensionless.  So if you are tracking radian as a dimensionless unit
it makes sense to have it in the units for torque.  Not for
newton-meter in general though, which is not necessarily used for
torque.

On Thu, Aug 25, 2022 at 8:50 PM Albert Dvornik via Boost
<boost_at_[hidden]> wrote:
>
> It looks like my previous message wasn't visible by non-HTML readers
> (including the list archive) because I didn't configure my so-called
> mailer correctly.  Sorry for the duplication and the hassle.
>
> bert
>
> --------------------
> Hi, all.
>
> The definitions of boost::units::torque_dimension,
> boost::units::si::torque, boost::units::si::newton_meter and
> boost::units::si::newton_meters seem broken. The most obvious symptom
> of this is that boost::units::si::newton_meter isn't the same thing as
> boost::units::si::newton * boost::units::si::meter (i.e. an actual N
> m), but is instead defined to be equivalent to *N m / rad* instead.
>
> I'm attaching a source file that shows the problem. I've compiled it
> with Boost 1.80, g++ 10.2.1.
>
> Am I confused in some way? If not, then I believe that the fix would
> be to modify boost/units/physical_dimensions/torque.hpp and remove the
> ", plane_angle_base_dimension,-1" in the current definition of
> torque_dimension.
>
> Regards,
> bert Dvornik
>
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-- 
Frank