Re: Engineering types hierarchy

["Matthew Heaney" <matthew_heaney@acm.org>]

In article <37d7ba7d@news1.prserv.net> , "Matthew Heaney" 
<matthew_heaney@acm.org> wrote:

I forget a couple more references.

1) I think there's an example in D.W. Jones' book, Ada In Action.  I don't
have a URL for the book handy, but why don't you email D.W. and ask him for
the URL?  (And be sure to post it here.)

Do-While Jones <do_while@RIDGECREST.CA.US>


2) The package Dimensioned_Units appears in section 9.3.8 of the Ada83
Rationale.  You can get that book on the web in the usual places, including
the AdaIC and the adahome.

<http://www.adaic.org/>
<htpp:/www.adahome.com/>


> In article <7r7dje$sdi5@svlss.lmms.lmco.com> , dkristol@see-my.sig (David
> Kristola) wrote:
>
>> Does anyone have any pointers to web available sources
>> or books that i might check out?
>
> Units of Measure As A Data Attribute
> Narain Gehani
> Computer Languages, Vol 2, p. 93-111 (1977?)
>
> Incorporation of Units into Programming Languages
> Michael Karr and David B. Loveman III
> CACM, May 1978, Vol 21, No. 5, p385-391
>
> Ada's Derived Types and Units of Measure
> N. H. Gehani
> Software-Practice and Experience
> Vol 15 (6), p555-569 (June 1985)
>
>
> Bill Whitaker's Units stuff
>
> The following text documents some of the considerations initially
> governing the search for a more powerful units capability.
>
> The problem is to provide an Ada 95 method of specifying SI units.
> It has philosophical interest in that the units example was the
> one used to illustrate the advantages of strong typing in the early
> requirements discussions.  It was unfortunate that the resulting Ada
> did not provide a convenient solution.  This was brought up to the
> Intermetrics Ada 95 team, but was apparently not "object-oriented"
> enough to receive consideration.
>
> <http://users.erols.com/whitaker/iss_418.htm>
>
>
> You should also search the PAL and the ASE.  Maybe Rick Conn can be of some
> assistance here, to help you find examples of what you're looking for.
>
> <http://wuarchive.wustl.edu/languages/ada/pal.html>
> <ftp://ftp.cdrom.com/pub/ase/index.htm>
> <http://xenadu.home.mindspring.com/>
>
>
> If you find something good, please post the URL etc to this newsgroup.
>
> Hope this helps some,
> Matt


--
Matt

It is impossible to feel great confidence in a negative theory which has
always rested its main support on the weak points of its opponent.

Joseph Needham, "A Mechanistic Criticism of Vitalism"