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Previous implementation actually failed to give correct results on

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many good compilers.  Still wondering about the use of
type_wrapper<T>* here. Wouldn't it be better to pass T*, and strip
const/volatile in has_##name##_helper ?


[SVN r16168]
This commit is contained in:
Dave Abrahams
2002-11-09 01:20:44 +00:00
parent 8d124d88bb
commit 86be3ece35
1 changed files with 20 additions and 22 deletions
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12
include/boost/mpl/aux_/has_xxx.hpp
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@@ -35,20 +35,18 @@ template< typename T > \
boost::mpl::aux::yes_tag \
has_##name##_helper( \
boost::mpl::aux::type_wrapper<T>* \
, BOOST_MSVC_TYPENAME T::name* \
, void (*)(BOOST_MSVC_TYPENAME T::name) = 0 \
); \
\
template< typename T > \
\
boost::mpl::aux::no_tag has_##name##_helper( \
boost::mpl::aux::type_wrapper<T>* \
, ... \
... \
); \
\
\
template< typename T > \
struct has_##name \
{ \
BOOST_STATIC_CONSTANT(bool, value = \
sizeof(has_##name##_helper((boost::mpl::aux::type_wrapper<T>*)0, 0)) \
sizeof((has_##name##_helper)((boost::mpl::aux::type_wrapper<T>*)0)) \
== sizeof(boost::mpl::aux::yes_tag) \
); \
}; \