1 files changed, 21 insertions, 1 deletions
diff --git a/contrib/src/boost/type_traits/is_default_constructible.hpp b/contrib/src/boost/type_traits/is_default_constructible.hpp
index 7fd63f8..fa5d76a 100644
--- a/contrib/src/boost/type_traits/is_default_constructible.hpp
+++ b/contrib/src/boost/type_traits/is_default_constructible.hpp
@@ -9,9 +9,14 @@
 #ifndef BOOST_TT_IS_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED
 #define BOOST_TT_IS_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED
 
+#include <cstddef> // size_t
 #include <boost/type_traits/integral_constant.hpp>
 #include <boost/detail/workaround.hpp>
 
+#if BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
+#include <boost/type_traits/is_abstract.hpp>
+#endif
+
 #if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40500)
 
 #include <boost/type_traits/detail/yes_no_type.hpp>
@@ -28,10 +33,25 @@ namespace boost{
          template<typename>
          static boost::type_traits::no_type test(...);
       };
-
+#if BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
+      template<class T, bool b> 
+      struct is_default_constructible_abstract_filter
+      {
+          static const bool value = sizeof(is_default_constructible_imp::test<T>(0)) == sizeof(boost::type_traits::yes_type);
+      };
+      template<class T> 
+      struct is_default_constructible_abstract_filter<T, true>
+      {
+          static const bool value = false;
+      };
+#endif
    }
 
+#if BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
+   template <class T> struct is_default_constructible : public integral_constant<bool, detail::is_default_constructible_abstract_filter<T, boost::is_abstract<T>::value>::value>{};
+#else
    template <class T> struct is_default_constructible : public integral_constant<bool, sizeof(detail::is_default_constructible_imp::test<T>(0)) == sizeof(boost::type_traits::yes_type)>{};
+#endif
    template <class T, std::size_t N> struct is_default_constructible<T[N]> : public is_default_constructible<T>{};
    template <class T> struct is_default_constructible<T[]> : public is_default_constructible<T>{};
    template <class T> struct is_default_constructible<T&> : public integral_constant<bool, false>{};