Re: [boost] [config] Rethinking feature macros?

Subject: Re: [boost] [config] Rethinking feature macros?
From: Peter Dimov (lists_at_[hidden])
Date: 2017-11-06 18:50:30

Andrey Semashev wrote:
> On 11/06/17 21:03, Peter Dimov via Boost wrote:
> > Steven Watanabe wrote:
> >
> >> We don't usually define macros independently for every compiler 
> >> version. The actual implementation generally looks like:
> >>
> >> #if COMPILER_VERSION < NNN
> >>   #define BOOST_NO_FEATURE
> >> #endif
> >>
> >> which is always the same amount of work regardless of whether it's a 
> >> positive or negative macro.
> >
> > This ignores -std=... though.
>
> We also test for BOOST_GCC_CXX11 or __cplusplus to take that into account.

Yes, it's the same either way, I guess.

#if COMPILER_VERSION < NNN || COMPILER_CXX < 17
# define BOOST_NO_CXX17_FEATURE
#endif