Re: [boost] Boost and exceptions

Subject: Re: [boost] Boost and exceptions
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2012-06-25 13:29:55

Daniel James wrote:
> On 25 June 2012 17:43, Stewart, Robert
> <Robert.Stewart_at_[hidden]> wrote:
> > Mathias Gaunard wrote:
> >>
> >> The whole point of the system is that there is a single
> >> place where you enable Boost.Exception support for all
> >> libraries.
> >
> > The original point of boost::throw_exception() was to
> > provide a fallback when exception support is not
> > available.  That it now enables Boost.Exception support is
> > the problem for some.
>
> Everything's always a problem for someone. Maybe it should
> have been opt-in rather than opt-out (for the user), but I
> don't think that would be an appropriate change now.

I'm not suggesting that.  Mathias was mischaracterizing the original purpose of the function.

> >> If some libraries were allowed to stick to non-
> >> Boost.Exception-enabled boost::throw_exception, then you
> >> couldn't transfer those exceptions between threads.
> >
> > You could in C++11, but that's another matter.
> >
> > There is no Boost policy that requires Boost.Exception
> > support.  If you think there should be, then lobby for
> > it.  Until then, library authors and maintainers can choose
> > to not support Boost.Exception
>
> As with writing warning free code, it isn't a policy but it
> is desirable.

Perhaps you're right, but if that isn't documented somewhere, or caught by reviewers for new libraries, then support will be spotty.

> > yet their libraries should be supported when exceptions are
> > not.
>
> Supported by whom?

I meant that there should be a standard Boost mechanism for such libraries to have a no-exceptions fallback without Boost.Exception support.  (If the community decides that Boost.Exception support is required, then this wouldn't be needed.)

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer                     using std::disclaimer;
Dev Tools & Components
Susquehanna International Group, LLP  http://www.sig.com

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