Re: [Boost-users] Re: Guidelines for effective exception usage

From: Victor A. Wagner Jr. (vawjr_at_[hidden])
Date: 2004-08-24 00:07:19

At Monday 2004-08-23 13:55, you wrote:
>Jeff Holle <jeff.holle_at_[hidden]> writes:
>
> > My two cents of the referenced html page.
> >
> > Not placing attributes like string into an exception class only makes
> > sense if the exception being thrown has
> > something to do with a memory starvation situation.
> >
> > For a lot of exception types that I can think of this is not the case.
> >
> > As an example of this std::runtime_error often has a string attribute
> > and this is perfectly fine.
>
>No it is not.  Even if you aren't throwing due to memory starvation,
>you could run out of memory during unwinding, when the exception is
>copied.  That leads you directly to terminate().  Do not pass Go; do
>not collect $200.

why would unwinding copy the exception?

>--
>Dave Abrahams
>Boost Consulting
>http://www.boost-consulting.com
>
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Victor A. Wagner Jr.      http://rudbek.com
The five most dangerous words in the English language:
               "There oughta be a law"