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From: Bo Persson (bop_at_[hidden])
Date: 2006-06-29 15:28:19

"Beman Dawes" <bdawes_at_[hidden]> skrev i meddelandet
> <Oliver.Kowalke_at_[hidden]> wrote in message
>> Hi,
>> shouldn't system_error::const char * what() const contain throw ()?
> Good question. I don't know the answer. The standard (for
> std::exception, which is the eventual base class) says:
> virtual const char* what() const throw();
> system_error::what catches exceptions, so it never throws.
> I afraid I still don't know the rule as to when you need to provide
> a throw() specifier rather than just documenting that a function
> never throws.
> Is there guidance from exception experts?

I'm not one of those, but have notice that several compilers (MSVC7.1,
Comeau) complain about virtual functions having a less strict throw
spec than the base class functions they override.

Seems to me like there would be a *real* surprise if

catch (const std::exception& e)

actually threw another exception, even if e is a derived exception

Bo Persson

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