Re: [Boost-users] Why is BOOST_OS_WINDOWS defined on Linux

Subject: Re: [Boost-users] Why is BOOST_OS_WINDOWS defined on Linux
From: David Demelier (markand_at_[hidden])
Date: 2018-05-04 05:21:40

Le 3 mai 2018 23:27, Chris Glover <[e-mail]> a écrit :
> On Thu, 3 May 2018 at 14:49 David Demelier via Boost-users <[e-mail]> wrote:
> > Hello,
> >
> > Everything is in the title, the following code compiles and shows
> > "Windows" even though I'm running Fedora 28. I can't understand.
> >
> >     #include <iostream>
> >
> >     #include <boost/predef.h>
> >
> >     int main()
> >     {
> >     #if defined(BOOST_OS_WINDOWS)
> >         puts("Windows");
> >     #endif
> >     }
> >
> > I'm using Boost 1.66 with GCC 8.0.1.
> >
> > Regards,
> >
> > -- 
> > David
>
> Hi David,
>
> The correct way to check is not if BOOST_OS_WINDOWS is defined or not, but whether it's non-zero or not.
>
> #include <iostream>
> #include <boost/predef.h>
>
> int main()
> {
> #if BOOST_OS_WINDOWS
>     puts("Windows");
> #endif
> }  

Ah! That explains everything :)

Just curious, is there some coding convention in boost? I just realized predef is the only one component that I use which use .h header suffix instead of .hpp.

Thanks.

-- 
David
>