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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
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Subject: Re: Various Language Architecture Questions
Date: Thu, 29 Sep 2005 18:24:32 -0500
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Date: 2005-09-29T18:24:32-05:00
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"Florian Weimer" <fw@deneb.enyo.de> wrote in message
news:87oe6eoz40.fsf@mid.deneb.enyo.de...
> * Simon Wright:
>
> >> Unfortunately, this is not true for some commonly used marshaling
> >> schemes.  Even Ada.Streams can be relatively slow (with long arrays
> >> with small components, for example).
> >
> > I've never understood why this _has_ to be. You would have thought
> > implementations could behave 'as if' to a large extent.
>
> Not unless this is explicitly specified because the number of calls is
> observable in most cases.

Yes, but Ada 200Y gives this explicit permission (see 13.13.2(56/2)). That's
especially important since Ada 95 compilers tended to take the pessistic
view, which makes streaming a lot slower than it has to be. Note that that
permission is available in Ada 95 as well (AI-195 is a Binding
Interpretation; the thinking was that leaving that permission out was an
oversight in Ada 95, one of many in the streaming stuff).

                           Randy.