-----Original Message----- From: boost-bounces@lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of Matthias Schabel Sent: Thursday, March 29, 2007 11:27 AM To: boost@lists.boost.org Subject: Re: [boost] units: review
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units. The original rationale was that
quantity<SI::length> q = 2*meters;
reads a bit better than
quantity<SI::length> q = 2*meter;
I'm confused by this syntax. The intent here is to assign a quantity of 2 meters to an "anonymous" quantity of length, correct? If so, wouldn't the following syntax make more sense? quantity<SI::length> q = quantity<SI::meter>(2); The "2*meters" syntax just seems rather obscure. Likewise, a "measure", a quantity with a specified unit, should be constructed without the need for qualification. quantity<SI::meter> q (2); That is, the "2*meters" should not be required when the unit is already explicitly specified as part of the type. By the way, while meter is an SI unit and therefore belongs in the SI namespace, length is not an SI dimension hence the name "length" does not belong in the SI namespace. It should probably be elevated to the boost::units namespace. I don't believe there is such a thing as an "SI dimension"; i.e. other system of measurement (e.g. Imperial) have units of length as well. Eric.