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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: 'Write attribute vs Write procedure.
Date: 22 May 2003 21:07:08 +0100
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mcq95@earthlink.net (Marc A. Criley) writes:

> Simon Wright <simon@pushface.org> wrote in message news:<x7v65o4j8y4.fsf@smaug.pushface.org>...
> 
> > I'm not sure whether an implementation has licence to produce code
> > which works "as if" this happened. What about the exceptional cases?
> > (where there isn't enough room in the stream for all the elements, for
> > example).
> 
> According to Robert Dewar, compilers do have such "as if" license:
> 
> "Remember that a compiler is always allowed to treat a language
> definition 'as-if', which means that any generated code that makes a
> compiler run the code the same way as some other way is equivalent. " 
> Posted 9/11/97 in comp.lang.ada.
> 
> (If you want to see the whole context of the post, do a Google groups
> search in comp.lang.ada with keywords:   Dewar "as if" "no semantic
> effect"
> The thread is titled "The Red Language".  I didn't include the URL
> because it's quite long and unwieldy.

I meant to say, it isn't clear that a failure due to overrun when
writing as a blob will have the same external effect as writing
individual elements; and I'm not sure whether the "as if" permission
includes "unless an exceptional condition occurs, in which case you
are allowed to behave differently".