From b62232c42ebfc0de09dfa84bff0b01ff39b1cf65 Mon Sep 17 00:00:00 2001
From: Nikolas Klauser <nikolasklauser@berlin.de>
Date: Thu, 17 Jul 2025 13:50:55 +0200
Subject: [PATCH] [libc++] Fix hash_multi{map,set}::insert

---
 libcxx/include/ext/hash_map                   |  4 +--
 libcxx/include/ext/hash_set                   |  4 +--
 .../gnu/hash_multimap/insert.pass.cpp         | 35 +++++++++++++++++++
 .../gnu/hash_multiset/insert.pass.cpp         | 35 +++++++++++++++++++
 4 files changed, 74 insertions(+), 4 deletions(-)
 create mode 100644 libcxx/test/extensions/gnu/hash_multimap/insert.pass.cpp
 create mode 100644 libcxx/test/extensions/gnu/hash_multiset/insert.pass.cpp

diff --git a/libcxx/include/ext/hash_map b/libcxx/include/ext/hash_map
index d6b92204f4376..46815eaffa8bd 100644
--- a/libcxx/include/ext/hash_map
+++ b/libcxx/include/ext/hash_map
@@ -744,7 +744,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI const_iterator begin() const { return __table_.begin(); }
   _LIBCPP_HIDE_FROM_ABI const_iterator end() const { return __table_.end(); }
 
-  _LIBCPP_HIDE_FROM_ABI iterator insert(const value_type& __x) { return __table_.__emplace_unique(__x); }
+  _LIBCPP_HIDE_FROM_ABI iterator insert(const value_type& __x) { return __table_.__emplace_multi(__x); }
   _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator, const value_type& __x) { return insert(__x); }
   template <class _InputIterator>
   _LIBCPP_HIDE_FROM_ABI void insert(_InputIterator __first, _InputIterator __last);
@@ -831,7 +831,7 @@ template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
 template <class _InputIterator>
 inline void hash_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::insert(_InputIterator __first, _InputIterator __last) {
   for (; __first != __last; ++__first)
-    __table_.__emplace_unique(*__first);
+    __table_.__emplace_multi(*__first);
 }
 
 template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
diff --git a/libcxx/include/ext/hash_set b/libcxx/include/ext/hash_set
index 7fd5df24ed3a8..62a7a0dbcffb9 100644
--- a/libcxx/include/ext/hash_set
+++ b/libcxx/include/ext/hash_set
@@ -458,7 +458,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI const_iterator begin() const { return __table_.begin(); }
   _LIBCPP_HIDE_FROM_ABI const_iterator end() const { return __table_.end(); }
 
-  _LIBCPP_HIDE_FROM_ABI iterator insert(const value_type& __x) { return __table_.__emplace_unique(__x); }
+  _LIBCPP_HIDE_FROM_ABI iterator insert(const value_type& __x) { return __table_.__emplace_multi(__x); }
   _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator, const value_type& __x) { return insert(__x); }
   template <class _InputIterator>
   _LIBCPP_HIDE_FROM_ABI void insert(_InputIterator __first, _InputIterator __last);
@@ -543,7 +543,7 @@ template <class _Value, class _Hash, class _Pred, class _Alloc>
 template <class _InputIterator>
 inline void hash_multiset<_Value, _Hash, _Pred, _Alloc>::insert(_InputIterator __first, _InputIterator __last) {
   for (; __first != __last; ++__first)
-    __table_.__emplace_unique(*__first);
+    __table_.__emplace_multi(*__first);
 }
 
 template <class _Value, class _Hash, class _Pred, class _Alloc>
diff --git a/libcxx/test/extensions/gnu/hash_multimap/insert.pass.cpp b/libcxx/test/extensions/gnu/hash_multimap/insert.pass.cpp
new file mode 100644
index 0000000000000..ea80359f1fea2
--- /dev/null
+++ b/libcxx/test/extensions/gnu/hash_multimap/insert.pass.cpp
@@ -0,0 +1,35 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// ADDITIONAL_COMPILE_FLAGS: -Wno-deprecated
+
+// hash_multimap::insert
+
+#include <cassert>
+#include <ext/hash_map>
+
+int main(int, char**) {
+  __gnu_cxx::hash_multimap<int, int> map;
+
+  map.insert(std::make_pair(1, 1));
+  map.insert(std::make_pair(1, 1));
+
+  assert(map.size() == 2);
+  assert(map.equal_range(1).first == map.begin());
+  assert(map.equal_range(1).second == map.end());
+
+  std::pair<int, int> arr[] = {std::make_pair(1, 1), std::make_pair(1, 1)};
+
+  map.insert(arr, arr + 2);
+
+  assert(map.size() == 4);
+  assert(map.equal_range(1).first == map.begin());
+  assert(map.equal_range(1).second == map.end());
+
+  return 0;
+}
diff --git a/libcxx/test/extensions/gnu/hash_multiset/insert.pass.cpp b/libcxx/test/extensions/gnu/hash_multiset/insert.pass.cpp
new file mode 100644
index 0000000000000..1a60cac158a40
--- /dev/null
+++ b/libcxx/test/extensions/gnu/hash_multiset/insert.pass.cpp
@@ -0,0 +1,35 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// ADDITIONAL_COMPILE_FLAGS: -Wno-deprecated
+
+// hash_multimap::insert
+
+#include <cassert>
+#include <ext/hash_set>
+
+int main(int, char**) {
+  __gnu_cxx::hash_multiset<int> map;
+
+  map.insert(1);
+  map.insert(1);
+
+  assert(map.size() == 2);
+  assert(map.equal_range(1).first == map.begin());
+  assert(map.equal_range(1).second == map.end());
+
+  int arr[] = {1, 1};
+
+  map.insert(arr, arr + 2);
+
+  assert(map.size() == 4);
+  assert(map.equal_range(1).first == map.begin());
+  assert(map.equal_range(1).second == map.end());
+
+  return 0;
+}