Re: [boost] Boost Units library preview

From: Phil Richards (news_at_[hidden])
Date: 2006-08-23 10:57:51

On 2006-08-23, Matthias Troyer <troyer_at_[hidden]> wrote:
>  - Nm would be a "dimension"

Not really.  It is the unit.
The dimension is: MASS * LENGTH^2 * TIME^2

>  - 1 Nm would be a "quantity"
>  - a torque measured in Nm or an energy measured in Nm would be two  
>  distinct units
>  - 1 Nm as torque, 1 Nm as energy or 1 J as energy would be three  
>  distinct measures

I think as far as a dimensionality checking goes, they are
all the same.  As far as a units checking goes, Nm and J
*could* be distinguished.  It's an interesting question as to what,
exactly, "energy" and "torque" are once you try to separate away
the dimensionality and units bits... :-)

phil
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