Re: [boost] Defining compilers suggestion

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2005-07-10 06:05:16

Edward Diener wrote:
> It would be much easier, and less confusing, when looking at compiler 
> workarounds in Boost code if their were defines for various 
> compilers/versions in a configuratiion header file such as:
> 
> #define BOOST_COMPILER_SOME_COMPILER_LOWER (PREPROCESSOR_TAG >= nnnn)
> #define BOOST_COMPILER_SOME_COMPILER_UPPER (PREPROCESSOR_TAG <= nnnn)
> #define BOOST_COMPILER_SOME_COMPILER (BOOST_COMPILER_SOME_COMPILER_LOWER 
> && BOOST_COMPILER_SOME_COMPILER_UPPER)
> 
> where SOME_COMPILER might be VC71,GCC40 etc.
> 
> Then in code one could see:
> 
> #if defined(BOOST_COMPILER_VC71) etc.
> 
> rather than the less understandable
> 
> #if defined(MSC_VER == nnnn) etc.
> 
> I would just like to see more readability in the Boost code regarding 
> compiler workarounds. I am also aware their is a workaround macro, but 
> even that deals in compiler preprocessor tags rather than a more 
> readable compiler version. I am aware that many workarounds have to deal 
> with versions before or after a certain version number but even that can 
> be made more readable by macros which tell one the actual compiler which 
> is involved.
> 
> I realize I am just a reader of Boost code and not a Boost developer but 
> I think this suggestion would make for a little more readable code in 
> its own small way.
> 

How about these?

   #define BOOST_COMPILER_WITH_VERSION(compiler,version) \
     (compiler == version)

   #define BOOST_COMPILER_ABOVE_VERSION(compiler,version) \
     (compiler > version)

   #define BOOST_COMPILER_FROM_VERSION(compiler,version) \
     (compiler >= version)

   #define BOOST_COMPILER_BELOW_VERSION(compiler,version) \
     ((compiler != 0) && (compiler < version))

   #define BOOST_COMPILER_UP_TO_VERSION(compiler,vesionr) \
     ((compiler != 0) && (compiler <= version))

   #define BOOST_COMPILER_FROM_TO_VERSION(compiler,min_version,max_version) \
     ((compiler != 0) && ((compiler >= min_version) && (compiler <= max_version)))

Example:

   #if BOOST_COMPILER_BELOW_VERSION(BOOST_MSVC,1400)
     ...
   #endif

Regards,

Tobias