From 1f3a3a1553dc316ed002354dce3ba3f081b2e102 Mon Sep 17 00:00:00 2001
From: jzmaddock <jz.maddock@gmail.com>
Date: Wed, 13 Jan 2016 10:50:22 +0000
Subject: [PATCH] Fixes for older GCC versions, see issue 11904.

---
 .../type_traits/is_default_constructible.hpp  | 21 ++++++++++++++++++-
 .../is_nothrow_move_assignable.hpp            |  2 +-
 .../is_nothrow_move_constructible.hpp         |  2 +-
 test/is_default_constr_test.cpp               |  2 ++
 4 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/include/boost/type_traits/is_default_constructible.hpp b/include/boost/type_traits/is_default_constructible.hpp
index 7fd63f8969..0b7d960e7d 100644
--- a/include/boost/type_traits/is_default_constructible.hpp
+++ b/include/boost/type_traits/is_default_constructible.hpp
@@ -12,6 +12,10 @@
 #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 +32,25 @@ 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>{};
diff --git a/include/boost/type_traits/is_nothrow_move_assignable.hpp b/include/boost/type_traits/is_nothrow_move_assignable.hpp
index 9755430ecf..4fb5bd8a6d 100644
--- a/include/boost/type_traits/is_nothrow_move_assignable.hpp
+++ b/include/boost/type_traits/is_nothrow_move_assignable.hpp
@@ -33,7 +33,7 @@ template <class T> struct is_nothrow_move_assignable<T&> : public false_type{};
 template <class T> struct is_nothrow_move_assignable<T&&> : public false_type{};
 #endif
 
-#elif !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_SFINAE_EXPR)
+#elif !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_SFINAE_EXPR) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
 
 namespace detail{
 
diff --git a/include/boost/type_traits/is_nothrow_move_constructible.hpp b/include/boost/type_traits/is_nothrow_move_constructible.hpp
index 8f4cee2cf9..4c8f734726 100644
--- a/include/boost/type_traits/is_nothrow_move_constructible.hpp
+++ b/include/boost/type_traits/is_nothrow_move_constructible.hpp
@@ -26,7 +26,7 @@ struct is_nothrow_move_constructible : public integral_constant<bool, BOOST_IS_N
 template <class T> struct is_nothrow_move_constructible<volatile T> : public ::boost::false_type {};
 template <class T> struct is_nothrow_move_constructible<const volatile T> : public ::boost::false_type{};
 
-#elif !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_SFINAE_EXPR) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
+#elif !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_SFINAE_EXPR) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40800)
 
 #include <boost/type_traits/declval.hpp>
 #include <boost/utility/enable_if.hpp>
diff --git a/test/is_default_constr_test.cpp b/test/is_default_constr_test.cpp
index 89444b3789..acc09acf7e 100644
--- a/test/is_default_constr_test.cpp
+++ b/test/is_default_constr_test.cpp
@@ -198,7 +198,9 @@ BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<bug11324_derived>::
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<deleted_default_construct>::value, false);
 #endif
+#if !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<private_default_construct>::value, false);
+#endif
 
 TT_TEST_END