On Thu, 3 May 2018 at 14:49 David Demelier via Boost-users <boost-users@lists.boost.org> 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
}