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Subject: Re: [boost] Official warnings policy?
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-11-06 08:37:59

Emil Dotchevski wrote:
> On Thu, Nov 5, 2009 at 3:46 PM, Kim Barrett
> <kab.conundrums_at_[hidden]> wrote:
> > On Nov 5, 2009, at 5:32 PM, Emil Dotchevski wrote:
> >> On Thu, Nov 5, 2009 at 1:50 PM, Kim Barrett
> <kab.conundrums_at_[hidden]>
> >> wrote:
> >>> On Nov 5, 2009, at 2:04 PM, Emil Dotchevski wrote:
> >>>> - non-virtual-dtor on GCC contradicts a valid design choice.
> >>> At least in recent versions of gcc, this warning is not
> >>> generated when there is a non-public dtor.
> >> This doesn't help much. [...] but it will complain in the derived
> >> class, which typically doesn't even define a destructor explicitly.
> > On the other hand, once one
> > has paid the cost of making a class polymorphic anyway, is
> > there really much
> > (if any?) benefit to making its destructor non-virtual?


> Q: Who would want to know that boost::exception_ptr's
> destructor is not virtual?
> A: Only someone who wants to build a polymorphic type hierarchy with
> boost::exception_ptr as a base, calling delete through a
> boost::exception_ptr base pointer.
> So, exception_ptr's destructor should be virtual to keep *that* guy
> out of trouble?

Making the dtor virtual does no harm and avoids questions and concerns from any of your customers. The decision seems easy.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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