[libcxx-commits] [libcxx] [libc++] Avoid type-punning between __value_type and pair (PR #134819)

[Nikolas Klauser via libcxx-commits]

================
@@ -1135,6 +1126,17 @@ public:
     return __emplace_hint_multi(__p, std::forward<_Vp>(__v));
   }
 
+  template <class _ValueT = _Tp, __enable_if_t<__is_tree_value_type<_ValueT>::value, int> = 0>
+  _LIBCPP_HIDE_FROM_ABI void __insert_from_orphaned_node(const_iterator __p, __get_node_value_type_t<_Tp>&& __value) {
+    using __key_type = typename _NodeTypes::key_type;
+    __emplace_hint_multi(__p, const_cast<__key_type&&>(__value.first), std::move(__value.second));
+  }
+
+  template <class _ValueT = _Tp, __enable_if_t<!__is_tree_value_type<_ValueT>::value, int> = 0>
+  _LIBCPP_HIDE_FROM_ABI void __insert_from_orphaned_node(const_iterator __p, _Tp&& __value) {
+    __emplace_hint_multi(__p, std::move(__value));
+  }
----------------
philnik777 wrote:

This is now used in `map` as well to avoid a `reinterpret_cast` there.

https://github.com/llvm/llvm-project/pull/134819