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Workarounds for gcc-3.2

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[SVN r21499]
This commit is contained in:
Dave Abrahams
2004-01-05 14:36:18 +00:00
parent 7fa0daffb1
commit dc50912e64
1 changed files with 24 additions and 21 deletions
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45
include/boost/mpl/aux_/has_xxx.hpp
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@@ -32,27 +32,30 @@
// Rani Sharoni (comp.lang.c++.moderated, 2002-03-17 07:45:09 PST)
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, unused) \
template< typename T > \
struct trait \
{ \
template< typename U > \
static boost::mpl::aux::yes_tag \
helper( \
boost::mpl::aux::type_wrapper<U> const volatile* \
, boost::mpl::aux::type_wrapper<BOOST_MSVC_TYPENAME U::name>* = 0 \
); \
\
static boost::mpl::aux::no_tag \
helper(...); \
\
typedef boost::mpl::aux::type_wrapper<T> t_; \
\
BOOST_STATIC_CONSTANT( \
bool, value = \
sizeof(trait<T>::helper(static_cast<t_*>(0))) \
== sizeof(boost::mpl::aux::yes_tag) \
); \
}; \
template< typename T > \
struct trait \
{ \
struct helpers \
{ \
template< typename U > \
static boost::mpl::aux::yes_tag \
test( \
boost::mpl::aux::type_wrapper<U> const volatile* \
, boost::mpl::aux::type_wrapper<BOOST_MSVC_TYPENAME U::name>* = 0 \
); \
\
static boost::mpl::aux::no_tag \
test(...); \
}; \
\
typedef boost::mpl::aux::type_wrapper<T> t_; \
\
BOOST_STATIC_CONSTANT( \
bool, value = \
sizeof(helpers::test(static_cast<t_*>(0))) \
== sizeof(boost::mpl::aux::yes_tag) \
); \
}; \
/**/
# else