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VC7.1+ workaround :(

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[SVN r21523]
This commit is contained in:
Dave Abrahams
2004-01-07 05:03:10 +00:00
parent 9e8baa64f1
commit 232a2f9048
1 changed files with 28 additions and 0 deletions
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28
include/boost/mpl/aux_/has_xxx.hpp
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@@ -31,6 +31,32 @@
// 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)
# if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1400))
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, unused) \
template< typename T > \
boost::mpl::aux::yes_tag \
trait##_helper( \
boost::mpl::aux::type_wrapper<T> const volatile* \
, boost::mpl::aux::type_wrapper<BOOST_MSVC_TYPENAME T::name>* = 0 \
); \
\
boost::mpl::aux::no_tag \
trait##_helper(...); \
\
template< typename T > \
struct trait \
{ \
typedef boost::mpl::aux::type_wrapper<T> t_; \
BOOST_STATIC_CONSTANT(bool, value = \
sizeof((trait##_helper)(static_cast<t_*>(0))) \
== sizeof(boost::mpl::aux::yes_tag) \
); \
}; \
/**/
# else // conforming compilers
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, unused) \
template< typename T > \
struct trait \
@@ -58,6 +84,8 @@ struct trait \
}; \
/**/
# endif
# else
# include "boost/mpl/if.hpp"