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From: Gautier write-only <gautier_niouzes@hotmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Performance of the Streams 'Read and 'Write
Date: Mon, 2 Nov 2009 14:16:30 -0800 (PST)
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On 2 nov, 22:37, "Randy Brukardt" <ra...@rrsoftware.com> wrote:

> IMHO, Ada compilers should do that. (There's specifically a permission to do
> this optimization in Ada 2005: 13.13.2(56/2).)

Excellent news!

> That's an intergral part of
> the stream attribute implementation on Janus/Ada. (Disclaimer: the entire
> stream attribute implementation on Janus/Ada doesn't work right, quite
> probably because it is too complicated. So perhaps there is a reason that
> other Ada compilers don't do that. :-) Note, however, that it is pretty rare
> that you could actually do that (only about 15% of the composite types I've
> seen in Janus/Ada would qualify).

Sure - but imagine that these 15% might transport 95% of the
information. It could happen, couldn't it ?
And if type T qualifies, a record type R with fields of types T,U,V (U
and V not qualifying) will be also transmitted faster, an array of R
will also go faster, and so on...

> So I'm not surprised that implementers
> have left that capability out in favor of things that happen more often.

I am not surprised either...

Gautier