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From: kilgallen@eisner.decus.org (Larry Kilgallen)
Subject: What is a Display ? (was: Subverting 'Access for Sub-programs)
Date: 1999/08/05
Message-ID: <1999Aug5.175752.1@eisner>#1/1
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References: <37A71EF1.2201@dera.gov.uk> <37A7FDE8.4F5@dera.gov.uk>
 <7o9vrv$qgt$1@wanadoo.fr>
 <Pine.BSF.4.10.9908042041540.29130-100000@shell5.ba.best.com>
 <7oc5ih$6mb$1@wanadoo.fr> <7occq3$g9v$1@nnrp1.deja.com>
 <7ocra4$s8o$1@nnrp1.deja.com>
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Newsgroups: comp.lang.ada
Date: 1999-08-05T00:00:00+00:00
List-Id: <comp.lang.ada>

... in the context of the following comments:

In article <7ocra4$s8o$1@nnrp1.deja.com>, Robert Dewar <robert_dewar@my-deja.com> writes:

> Remember that Ada 83 was biased towards making the use of
> displays efficient (this is in fact why Steelman prohibited
> the language from containing subprogram pointers).
> 
> Remember that the decision not to allow pointers to nested
> procedures in Ada 95 was based on implementation difficulties
> with displays. You can second guess this non-technical decision
> if you like, but for example, I have heard Aonix folk say that
> the current Object Ada would have been significantly impacted
> had the decision been made any other way.
> 
> Remember that Pascal and Algol semantics definitely IS tricky
> for displays, as is well known (nearly all Pascal compilers
> use static links).