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fixes for reference types and I think arrays as well

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[SVN r16163]
This commit is contained in:
Dave Abrahams
2002-11-08 17:07:20 +00:00
parent 1bcf23d65b
commit 96055b2fe9
1 changed files with 7 additions and 6 deletions
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13
include/boost/mpl/aux_/has_xxx.hpp
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@@ -25,7 +25,7 @@
#if !defined(BOOST_MPL_BROKEN_OVERLOAD_RESOLUTION)
# if !defined(BOOST_MSVC) || BOOST_MSVC > 1300
# if (!defined(BOOST_MSVC) || BOOST_MSVC > 1300) && (!defined _MSC_VER || !defined(BOOST_INTEL_CXX_VERSION) || BOOST_INTEL_CXX_VERSION > 500)
// the implementation below is based on a USENET newsgroup's posting by
// Rani Sharoni (comp.lang.c++.moderated, 2002-03-17 07:45:09 PST)
@@ -61,19 +61,20 @@ struct has_##name \
// note that the code is _not_ standard-conforming, but it works,
// and it resolves some nasty ICE cases with the above implementation
// Modified dwa 8/Oct/02 to handle reference types. Still won't work
// for array types; I don't have an answer for that one.
// Modified dwa 8/Oct/02 to handle reference types.
namespace boost { namespace mpl { namespace aux { struct has_xxx_tag; } } }
# define BOOST_MPL_HAS_XXX_TRAIT_DEF_(name) \
template< typename T, typename name = int > \
template< typename T, typename name = ::boost::mpl::aux::has_xxx_tag > \
struct has_##name : T \
{ \
private: \
static boost::mpl::aux::no_tag test(int*); \
static boost::mpl::aux::no_tag test(void(*)(::boost::mpl::aux::has_xxx_tag)); \
static boost::mpl::aux::yes_tag test(...); \
\
public: \
BOOST_STATIC_CONSTANT(bool, value = \
sizeof(test(static_cast<name(*)()>(0))) != sizeof(boost::mpl::aux::no_tag) \
sizeof(test(static_cast<void(*)(name)>(0))) != sizeof(boost::mpl::aux::no_tag) \
); \
}; \
\