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Subject: Re: [boost] [c++1] BOOST_NOEXCEPT macros?
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-10-19 11:47:34

Domagoj Saric wrote:
> On 11.10.2011. 13:54, Beman Dawes wrote:
> > Good question. There are two cases:
> >
> > (1) For C++03 compilers, the macro user wants the mentioned
> > compiler specifics. That's the case an additional macro is
> > needed for.
> >
> > (2) For C++03 compilers, the macro user wants nothing
> > inserted. That's the case covered by the macros I've added to
> > trunk. This case arises because a lot of existing code isn't
> > decorated with either throw() or a compiler specific
> > attribute, and the user doesn't want to add that now. In
> > applying noexcept to the standard library, this was by far
> > the most common situation encountered - there was no existing
> > exception specification.
> >
> > Note that cases (1) and (2) may be interleaved in the same
> > translation unit, so using a config macro to specify the
> > behavior won't work well, and isn't a preferred approach
> > anyhow.
> I must say I still don't see why (1) would require an
> additional macro because I don't see why (2) would be
> required/wanted at all..? IOW why would someone want
> noexcept but not __attribute__(( nothrow ))?

Using (1) on existing code could change behavior. Using (2) leaves existing behavior unchanged while paving the way for using noexcept in C++11.

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


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