template <typename T> struct is_union_impl
{
typedef typename remove_cv<T>::type cvt;
+#ifdef BOOST_IS_UNION
BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(cvt));
+#else
+ BOOST_STATIC_CONSTANT(bool, value = false);
+#endif
};
#else
//
//
template <typename T> struct is_union_impl
{
+#ifdef BOOST_IS_UNION
BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(T));
+#else
+ BOOST_STATIC_CONSTANT(bool, value = false);
+#endif
};
#endif
} // namespace detail