[boost] Re: enable_if review

From: David Abrahams (dave_at_[hidden])
Date: 2003-10-07 22:46:26

Douglas Gregor <gregod_at_[hidden]> writes:

> The only omission I see is a listing of supported compilers, either in the 
> source or in the documentation. enable_if doesn't work anywhere, and I've 
> been trying to catalogue the places it fails. I'd like to have a config macro 
> BOOST_NO_ENABLE_IF to tell when this library is not available (and, in fact, 
> the library header should also check this macro: right now, it isn't safe to 
> include with compilers that don't support partial specialization). My laundry 
> list of compilers that I couldn't get to work with enable_if follows (it's 
> from boost/function/function_base.hpp).

boost/iterator/detail/config_def.hpp contains a similar list (the
macro is BOOST_NO_SFINAE).  I've mentioned this before.

> I vote to accept this library.
>
> 	Doug
>
> // GCC 2.95.3 (or earlier) doesn't support enable_if
> #if BOOST_WORKAROUND(__GNUC__, < 3)
> #  define BOOST_FUNCTION_NO_ENABLE_IF
> #endif
>
> // MIPSpro 7.3.1.3m doesn't support enable_if
> #if defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730 
> && !defined(BOOST_STRICT_CONFIG)
> #  define BOOST_FUNCTION_NO_ENABLE_IF
> #endif
>
> // MSVC 7.0 doesn't support enable_if
> #if defined(BOOST_MSVC) && BOOST_MSVC <= 1300 && !defined(BOOST_STRICT_CONFIG)
> #  define BOOST_FUNCTION_NO_ENABLE_IF
> #endif
>
> // Borland C++ 5.6.0 doesn't support enable_if
> #if BOOST_WORKAROUND(__BORLANDC__, <= 0x564)
> #  define BOOST_FUNCTION_NO_ENABLE_IF
> #endif
>
> // Metrowerks 7.2 doesn't support enable_if
> #if BOOST_WORKAROUND(__MWERKS__, <= 0x2407)
> #  define BOOST_FUNCTION_NO_ENABLE_IF
> #endif
>
> #if BOOST_WORKAROUND(__SUNPRO_CC, <= 0x540)
> #  define BOOST_FUNCTION_NO_ENABLE_IF
> #endif
>
>
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-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com