Re: [boost] [config] New identification system [was: Macro proposal]

From: David Abrahams (dave_at_[hidden])
Date: 2006-06-17 07:06:38

Gennaro Prota <gennaro_prota_at_[hidden]> writes:

> On Thu, 15 Jun 2006 13:19:36 -0400, David Abrahams
> <dave_at_[hidden]> wrote:
>
>>   BOOST_WORKAROUND(CXX_MSVC, <=, 7,1,0)
>>   BOOST_WORKAROUND(CXX_MSVC, tested_at, 7,1,0)
>>
>>is an implementable syntax.
>
> I'd have three questions, but maybe it's quicker to ask directly: "can
> you post the implementation you are thinking to?"

Sorry, what I was thinking of won't work because you can't paste
anything onto "<=".  But 

   BOOST_WORKAROUND(CXX_MSVC, <=, 7,1,0)
   BOOST_WORKAROUND(CXX_MSVC, BOOST_TESTED_AT, 7,1,0)

ought to work.

Something like:

# ifndef BOOST_STRICT_CONFIG

#  define BOOST_WORKAROUND(symbol, test, major, minor, subminor)    \
        ((symbol != 0)                                              \
        && (1 % (( (                                                \
            symbol test( BOOST_VERSION(major,minor,subminor))) ) + 1)))

#  ifdef BOOST_DETECT_OUTDATED_WORKAROUNDS
#   define BOOST_OPEN_PAREN (
#   define BOOST_TESTED_AT(value)  > value) ?(-1): BOOST_OPEN_PAREN 1
#  else
#   define BOOST_TESTED_AT(value) != ((value)-(value))
#  endif

# else

#  define BOOST_WORKAROUND(symbol, test, major, minor, subminor) 0

# endif 

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com