Fix order and types of members in C++17 insert_return_type structs

PR libstdc++/80761
	* include/bits/node_handle.h (_Node_insert_return): Reorder members.
	(tuple_size, tuple_element): Remove partial specializations.
	* include/bits/stl_tree.h (_Rb_tree::insert_return_type): Use
	const_iterator for std::set.
	* testsuite/23_containers/map/modifiers/extract.cc: New.
	* testsuite/23_containers/set/modifiers/extract.cc: New.
	* testsuite/23_containers/unordered_map/modifiers/extract.cc: New.
	* testsuite/23_containers/unordered_set/modifiers/extract.cc: New.

From-SVN: r248062

libstdc++-v3/ChangeLog

@@ -1,3 +1,15 @@
+2017-05-15  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/80761
+	* include/bits/node_handle.h (_Node_insert_return): Reorder members.
+	(tuple_size, tuple_element): Remove partial specializations.
+	* include/bits/stl_tree.h (_Rb_tree::insert_return_type): Use
+	const_iterator for std::set.
+	* testsuite/23_containers/map/modifiers/extract.cc: New.
+	* testsuite/23_containers/set/modifiers/extract.cc: New.
+	* testsuite/23_containers/unordered_map/modifiers/extract.cc: New.
+	* testsuite/23_containers/unordered_set/modifiers/extract.cc: New.
+
 2017-05-12  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/78939

libstdc++-v3/include/bits/node_handle.h

@@ -280,8 +280,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Iterator, typename _NodeHandle>
     struct _Node_insert_return
     {
-      bool		inserted = false;
       _Iterator		position = _Iterator();
+      bool		inserted = false;
       _NodeHandle	node;
 
       template<size_t _Idx>
@@ -305,22 +305,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	}
     };
 
-  template<typename _Iterator, typename _NodeHandle>
-    struct tuple_size<_Node_insert_return<_Iterator, _NodeHandle>>
-    : integral_constant<size_t, 3> { };
-
-  template<typename _Iterator, typename _NodeHandle>
-    struct tuple_element<0, _Node_insert_return<_Iterator, _NodeHandle>>
-    { using type = bool; };
-
-  template<typename _Iterator, typename _NodeHandle>
-    struct tuple_element<1, _Node_insert_return<_Iterator, _NodeHandle>>
-    { using type = _Iterator; };
-
-  template<typename _Iterator, typename _NodeHandle>
-    struct tuple_element<2, _Node_insert_return<_Iterator, _NodeHandle>>
-    { using type = _NodeHandle; };
-
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 

libstdc++-v3/include/bits/stl_tree.h

@@ -812,7 +812,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 #if __cplusplus > 201402L
       using node_type = _Node_handle<_Key, _Val, _Node_allocator>;
-      using insert_return_type = _Node_insert_return<iterator, node_type>;
+      using insert_return_type = _Node_insert_return<
+	conditional_t<is_same_v<_Key, _Val>, const_iterator, iterator>,
+	node_type>;
 #endif
 
       pair<_Base_ptr, _Base_ptr>

libstdc++-v3/testsuite/23_containers/map/modifiers/extract.cc

@@ -135,6 +135,17 @@ test03()
   static_assert( is_same_v<test_type::node_type, compat_type3::node_type> );
 }
 
+void
+test04()
+{
+  // Check order of members in insert_return_type
+  auto [pos, ins, node] = test_type::insert_return_type{};
+  using std::is_same_v;
+  static_assert( is_same_v<test_type::iterator, decltype(pos)> );
+  static_assert( is_same_v<bool, decltype(ins)> );
+  static_assert( is_same_v<test_type::node_type, decltype(node)> );
+}
+
 int
 main()
 {

libstdc++-v3/testsuite/23_containers/set/modifiers/extract.cc

@@ -126,6 +126,17 @@ test03()
   static_assert( is_same_v<test_type::node_type, compat_type3::node_type> );
 }
 
+void
+test04()
+{
+  // Check order of members in insert_return_type
+  auto [pos, ins, node] = test_type::insert_return_type{};
+  using std::is_same_v;
+  static_assert( is_same_v<test_type::iterator, decltype(pos)> );
+  static_assert( is_same_v<bool, decltype(ins)> );
+  static_assert( is_same_v<test_type::node_type, decltype(node)> );
+}
+
 int
 main()
 {

libstdc++-v3/testsuite/23_containers/unordered_map/modifiers/extract.cc

@@ -136,6 +136,17 @@ test03()
   static_assert( is_same_v<test_type::node_type, compat_type3::node_type> );
 }
 
+void
+test04()
+{
+  // Check order of members in insert_return_type
+  auto [pos, ins, node] = test_type::insert_return_type{};
+  using std::is_same_v;
+  static_assert( is_same_v<test_type::iterator, decltype(pos)> );
+  static_assert( is_same_v<bool, decltype(ins)> );
+  static_assert( is_same_v<test_type::node_type, decltype(node)> );
+}
+
 int
 main()
 {

libstdc++-v3/testsuite/23_containers/unordered_set/modifiers/extract.cc

@@ -128,6 +128,17 @@ test03()
   static_assert( is_same_v<test_type::node_type, compat_type3::node_type> );
 }
 
+void
+test04()
+{
+  // Check order of members in insert_return_type
+  auto [pos, ins, node] = test_type::insert_return_type{};
+  using std::is_same_v;
+  static_assert( is_same_v<test_type::iterator, decltype(pos)> );
+  static_assert( is_same_v<bool, decltype(ins)> );
+  static_assert( is_same_v<test_type::node_type, decltype(node)> );
+}
+
 int
 main()
 {