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Modified to handle reference types. Still won't work for array types;

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I don't have an answer for that one.


[SVN r16162]
This commit is contained in:
Dave Abrahams
2002-11-08 15:49:52 +00:00
parent 5c2e26c512
commit 1bcf23d65b
1 changed files with 4 additions and 2 deletions
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6
include/boost/mpl/aux_/has_xxx.hpp
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@@ -39,7 +39,7 @@ has_##name##_helper( \
); \
\
template< typename T > \
no_tag has_##name##_helper( \
boost::mpl::aux::no_tag has_##name##_helper( \
boost::mpl::aux::type_wrapper<T>* \
, ... \
); \
@@ -61,6 +61,8 @@ 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.
# define BOOST_MPL_HAS_XXX_TRAIT_DEF_(name) \
template< typename T, typename name = int > \
struct has_##name : T \
@@ -71,7 +73,7 @@ struct has_##name : T \
\
public: \
BOOST_STATIC_CONSTANT(bool, value = \
sizeof(test(static_cast<name*>(0))) != sizeof(boost::mpl::aux::no_tag) \
sizeof(test(static_cast<name(*)()>(0))) != sizeof(boost::mpl::aux::no_tag) \
); \
}; \
\