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Nick Keighley  
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 More options Oct 11 2012, 8:35 am
Newsgroups: comp.programming
From: Nick Keighley <nick_keighley_nos...@hotmail.com>
Date: Thu, 11 Oct 2012 05:35:23 -0700 (PDT)
Local: Thurs, Oct 11 2012 8:35 am
Subject: Re: etiology of exceptions
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On Oct 10, 6:24 pm, "LudovicoVan" <ju...@diegidio.name> wrote:

> "Nick Keighley" <nick_keighley_nos...@hotmail.com> wrote in message

> news:02c3ed18-a81a-4ae0-b03d-666bc239d862@k6g2000vbr.googlegroups.com...> On Oct 8, 7:13 am, jussi.san...@ard.fi wrote:
> >> tiistai, 25. syyskuuta 2012 17.29.21 UTC+3 bob kirjoitti:

> <snip>

> >> -exception are no program flow cotrol structures

> > probably

> But they do alter/contribute to the program flow (I mean, even when used
> properly).  To the point that we do model that flow, say, in a unit
> functional diagram.

> >> -exception do not add to program correctness, but to robustness
> >> (operation out of specifications)

> > the exceptions a function may throw could be thought of as part of its
> > specification (though C++ has problems with this)

> If it is not in the spec, it is not an exception in the technical sense.
> This might be clearer if we think, for instance, of the case of accessing an
> external API.

the difficulty is that exception specifications are broken in C++

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3051.html
(that's just the first hit I got looking for "C++ exception problem")

If you are specifying an API then the exceptions that may thrown are
usually documented (eg. with comments) but not by using exception
specifications


 
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