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From: Bill Long <longb@cray.com>
To: Van Snyder <Van.Snyder@jpl.nasa.gov>, fortran standards email list for J3
	<j3@mailman.j3-fortran.org>
CC: sc22wg5 <sc22wg5@open-std.org>
Subject: Re: (j3.2006) (SC22WG5.5739)   Units of measure
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On Jun 29, 2016, at 3:58 PM, Van Snyder <Van.Snyder@jpl.nasa.gov> wrote:

> On Wed, 2016-06-29 at 12:35 +0000, Bill Long wrote:
>> The implementation costs greatly outweigh the benefit in this case,
>> and vendors are not awash with free resources for such a project.=20
>=20
> I'm not convinced about the relationship of cost to benefit.  Remember
> that the cost is incurred once by vendors,

Once? Except for the inevitable changes and enhancements, and the ongoing t=
esting and maintenance costs.=20

> and the benefit is enjoyed
> continuously thereafter by the vendors' thousands of customers.  So the
> question is "what would be the additional cost per customer?=94 =20

High when the number of customers is less than =93thousands=94.=20

> Has any
> vendor asked its customers "If the language and processor provided
> automatic units checking and conversion, would that be worth
> $n/license/year?"  Indeed has any vendor ever asked any customer any
> such question about any proposed language feature?  I've never been
> asked.

Well, for vendors who don=92t charge separately for the compiler, this is n=
ot a meaningful question.  =20

Is this something that has been added to C++  - a language ecosystem that i=
s much easier to paste something onto? =20

I think the more relevant question is how many people are asking for this, =
or need it.  That number seems to very small. (In my experience, one.)


>=20
> Several developers of preprocessors and analysis products have told me
> this is not a difficult problem. =20

Then perhaps that=92s the solution. Let the few who need this pay for it.=20


> We don't want to be tied to a
> commercial product because we have other users of our software who might
> not want (or be able) to afford the cost of the processor. =20

Ah, so you do want it to be free.=20

> I suspect
> there are others in the same boat.  If there were a GNU preprocessor,
> that might make a tiny difference.
>=20
> Have I missed something?

The previous iterations of this same discussion, perhaps.=20

Cheers,
Bill

>=20
>=20
> _______________________________________________
> J3 mailing list
> J3@mailman.j3-fortran.org
> http://mailman.j3-fortran.org/mailman/listinfo/j3

Bill Long                                                                  =
     longb@cray.com
Fortran Technical Support  &                                  voice:  651-6=
05-9024
Bioinformatics Software Development                     fax:  651-605-9142
Cray Inc./ Cray Plaza, Suite 210/ 380 Jackson St./ St. Paul, MN 55101


