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From: Preben Randhol <randhol+abuse@pvv.org>
Newsgroups: comp.lang.ada
Subject: Re: Announce: Grace project site operational
Date: Tue, 14 May 2002 18:07:53 +0000 (UTC)
Organization: Norwegian university of science and technology
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On Tue, 14 May 2002 17:50:47 GMT, tmoran@acm.org wrote:
>   How about a(nother) new Ada 0x construct:
>      dimension <real type> <multiplying operator> <real type>
> optionally appended to a type declaration, eg
> type Seconds is new Float;
> type Centimeters is new Float;
> type Grams is new Float;
> type Velocity is new Float dimension Centimeters/Seconds;
> type Acceleration is new Float dimension Velocity/Seconds;
> type Dynes is new Float dimension Grams*Acceleration;
>  t : Seconds;
>  d : Centimeters range 0.0 .. 100.0;
>  v : Velocity;
>  f : Dynes;
>   Then have the compiler allow an expression like "v*t" and have it
> do the dimensional analysis at compile seconds to know the result is
> of some declared type, in this case Centimeters.  v+t is still
> caught as an error and, since neither a square centimeter nor an erg
> type have been declared, expressions like d*d and f*d are caught.

As a chemist I want mol and Kelvin, but how do one deal with
constructions like this:

Constant = (C1*C2)/(C3^0.5)  = mol�/mol^0.5 = mol^(3/2)
or
Constant = C1/C2 = mol / mol = unitless

Preben