commit 82960cb6e64ca78b53fb799318087cb23b942079
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Jul 19 17:03:33 2018 +0100

    Simplify the base characteristics for some type traits
    
            * include/std/type_traits (__is_member_object_pointer_helper): Use
            __not_<is_function<_Tp>>::type instead of integral_constant.
            (__is_member_function_pointer_helper): Likewise for
            is_function<_Tp>::type.
            (is_compund): Likewise for __not_<is_fundamental<_Tp>>::type.
            (__do_is_nt_destructible_impl): Use __bool_constant and reindent.
            (is_trivially_constructible): Remove redundant use of
            is_constructible.
            (__is_trivially_copy_assignable_impl): Remove redundant use of
            is_copy_assignable.
            (__is_trivially_move_assignable_impl): Remove redundant use of
            is_move_assignable.
            (is_trivially_destructible): Use __bool_constant.
            * testsuite/20_util/is_trivially_assignable/value.cc: Add some more
            tests for scalar types.

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 4df82bf6d8c..aaa554c6200 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -396,7 +396,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template<typename _Tp, typename _Cp>
     struct __is_member_object_pointer_helper<_Tp _Cp::*>
-    : public integral_constant<bool, !is_function<_Tp>::value> { };
+    : public __not_<is_function<_Tp>>::type { };
 
   /// is_member_object_pointer
   template<typename _Tp>
@@ -411,7 +411,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template<typename _Tp, typename _Cp>
     struct __is_member_function_pointer_helper<_Tp _Cp::*>
-    : public integral_constant<bool, is_function<_Tp>::value> { };
+    : public is_function<_Tp>::type { };
 
   /// is_member_function_pointer
   template<typename _Tp>
@@ -603,7 +603,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// is_compound
   template<typename _Tp>
     struct is_compound
-    : public integral_constant<bool, !is_fundamental<_Tp>::value> { };
+    : public __not_<is_fundamental<_Tp>>::type { };
 
   template<typename _Tp>
     struct __is_member_pointer_helper
@@ -826,8 +826,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   struct __do_is_nt_destructible_impl
   {
     template<typename _Tp>
-      static integral_constant<bool, noexcept(declval<_Tp&>().~_Tp())>
-        __test(int);
+      static __bool_constant<noexcept(declval<_Tp&>().~_Tp())>
+      __test(int);
 
     template<typename>
       static false_type __test(...);
@@ -1136,8 +1136,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// is_trivially_constructible
   template<typename _Tp, typename... _Args>
     struct is_trivially_constructible
-    : public __and_<is_constructible<_Tp, _Args...>, __bool_constant<
-		      __is_trivially_constructible(_Tp, _Args...)>>::type
+    : public __bool_constant<__is_trivially_constructible(_Tp, _Args...)>
     { };
 
   /// is_trivially_default_constructible
@@ -1235,9 +1234,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template<typename _Tp>
     struct __is_trivially_copy_assignable_impl<_Tp, true>
-    : public __and_<is_copy_assignable<_Tp>,
-		    integral_constant<bool,
-			__is_trivially_assignable(_Tp&, const _Tp&)>>
+    : public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)>
     { };
 
   template<typename _Tp>
@@ -1256,9 +1253,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template<typename _Tp>
     struct __is_trivially_move_assignable_impl<_Tp, true>
-    : public __and_<is_move_assignable<_Tp>,
-		    integral_constant<bool,
-			__is_trivially_assignable(_Tp&, _Tp&&)>>
+    : public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)>
     { };
 
   template<typename _Tp>
@@ -1269,8 +1264,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// is_trivially_destructible
   template<typename _Tp>
     struct is_trivially_destructible
-    : public __and_<is_destructible<_Tp>, integral_constant<bool,
-			      __has_trivial_destructor(_Tp)>>
+    : public __and_<is_destructible<_Tp>,
+		    __bool_constant<__has_trivial_destructor(_Tp)>>
     { };
 
 
diff --git a/libstdc++-v3/testsuite/20_util/is_trivially_assignable/value.cc b/libstdc++-v3/testsuite/20_util/is_trivially_assignable/value.cc
index 1015d07c314..f3d73cb7e98 100644
--- a/libstdc++-v3/testsuite/20_util/is_trivially_assignable/value.cc
+++ b/libstdc++-v3/testsuite/20_util/is_trivially_assignable/value.cc
@@ -44,91 +44,113 @@ void test01()
   using std::is_trivially_assignable;
   using namespace __gnu_test;
 
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		int, int>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		int&, int>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		int&, int&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		int&, int&&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		int&, const int&>(true), "");
+  static_assert(test_property<is_trivially_assignable,
+		int&, int*>(false), "");
+  static_assert(test_property<is_trivially_assignable,
+		int&, void*>(false), "");
+  static_assert(test_property<is_trivially_assignable,
+		const int, int>(false), "");
+  static_assert(test_property<is_trivially_assignable,
+		const int&, int>(false), "");
+  static_assert(test_property<is_trivially_assignable,
+		const int&, const int&>(false), "");
+  static_assert(test_property<is_trivially_assignable,
+		const int*&, int*>(true), "");
+  static_assert(test_property<is_trivially_assignable,
+		int*&, const int*&>(false), "");
+  static_assert(test_property<is_trivially_assignable,
+		int*&, const int&>(false), "");
+  static_assert(test_property<is_trivially_assignable,
+		const int*&, void*>(false), "");
+  static_assert(test_property<is_trivially_assignable,
+		const void*&, void*>(true), "");
+  static_assert(test_property<is_trivially_assignable,
+		const void*&, int*>(true), "");
 
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		TType, TType>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		TType&, TType>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		TType&, TType&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		TType&, TType&&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		TType&, const TType&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		PODType, PODType>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		NType&, NType&>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		SLType, SLType>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::Empty, assign::Empty>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::Abstract, assign::Abstract>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::Ellipsis, assign::Ellipsis>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::DelEllipsis, assign::DelEllipsis>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::Any, assign::Any>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::DelDef, assign::DelDef>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::DelCopy, assign::DelCopy>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::Nontrivial, assign::Nontrivial>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::AnyAssign, assign::AnyAssign>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::DelAnyAssign, assign::DelAnyAssign>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::DelCopyAssign, assign::DelCopyAssign>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::MO, assign::MO>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::MO, assign::MO&&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::MO, assign::MO&>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		assign::MO, const assign::MO&>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		CopyConsOnlyType, CopyConsOnlyType>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		CopyConsOnlyType, const CopyConsOnlyType&>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		MoveConsOnlyType, MoveConsOnlyType>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		MoveConsOnlyType, MoveConsOnlyType&&>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		HasTemplateCAssign, HasTemplateCAssign>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		HasTemplateCAssign, const HasTemplateCAssign&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		ClassType, DerivedType>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		ClassType, DerivedType&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		ClassType, DerivedType&&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		ClassType, const DerivedType&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		MoveOnly, MoveOnly>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		MoveOnly, MoveOnly&&>(true), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		MoveOnly, MoveOnly&>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		MoveOnly, const MoveOnly&>(false), "");
-  static_assert(test_property<is_trivially_assignable, 
+  static_assert(test_property<is_trivially_assignable,
 		MoveOnly2, MoveOnly2>(false), "");
 }