Index: libcxx/test/std/containers/associative/map/map.observers/key_comp.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/std/containers/associative/map/map.observers/key_comp.pass.cpp
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// <map>
+
+// key_compare key_comp() const;
+
+#include <map>
+#include <cassert>
+#include <string>
+
+int main(int, char**) {
+    typedef std::map<int, std::string> map_type;
+
+    map_type m;
+    std::pair<map_type::iterator, bool> p1 = m.insert(map_type::value_type(1, "abc"));
+    std::pair<map_type::iterator, bool> p2 = m.insert(map_type::value_type(2, "abc"));
+
+    const map_type& cm = m;
+
+    assert(cm.key_comp()(p1.first->first, p2.first->first));
+    assert(!cm.key_comp()(p2.first->first, p1.first->first));
+}
Index: libcxx/test/std/containers/associative/map/map.observers/value_comp.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/std/containers/associative/map/map.observers/value_comp.pass.cpp
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// <map>
+
+// value_compare value_comp() const;
+
+#include <map>
+#include <cassert>
+#include <string>
+
+int main(int, char**) {
+    typedef std::map<int, std::string> map_type;
+
+    map_type m;
+    std::pair<map_type::iterator, bool> p1 = m.insert(map_type::value_type(1, "abc"));
+    std::pair<map_type::iterator, bool> p2 = m.insert(map_type::value_type(2, "abc"));
+
+    const map_type& cm = m;
+
+    assert(cm.value_comp()(*p1.first, *p2.first));
+    assert(!cm.value_comp()(*p2.first, *p1.first));
+}
Index: libcxx/test/std/containers/associative/map/map.value_compare/invoke.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/std/containers/associative/map/map.value_compare/invoke.pass.cpp
@@ -0,0 +1,47 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// <map>
+
+// class value_compare
+
+// bool operator()( const value_type& lhs, const value_type& rhs ) const;
+
+#include <map>
+#include <cassert>
+#include <string>
+#include <utility>
+
+template <typename Map>
+struct CallCompMember : Map::value_compare {
+    CallCompMember(const typename Map::value_compare& vc) : Map::value_compare(vc) {}
+
+    typedef typename Map::value_type value_type;
+    bool operator()(const value_type& value1, const value_type& value2) const {
+        return this->comp(value1.first, value2.first);
+    }
+};
+
+int main(int, char**) {
+    typedef std::map<int, std::string> map_type;
+
+    map_type m;
+    std::pair<map_type::iterator, bool> p1 = m.insert(map_type::value_type(1, "abc"));
+    std::pair<map_type::iterator, bool> p2 = m.insert(map_type::value_type(2, "abc"));
+
+    map_type::value_compare vc = m.value_comp();
+    CallCompMember<map_type> call_comp = m.value_comp();
+
+    assert(vc(*p1.first, *p2.first));
+    assert(call_comp(*p1.first, *p2.first));
+
+    assert(!vc(*p2.first, *p1.first));
+    assert(!call_comp(*p2.first, *p1.first));
+
+    return 0;
+}
Index: libcxx/test/std/containers/associative/map/map.value_compare/types.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/std/containers/associative/map/map.value_compare/types.pass.cpp
@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// <map>
+
+// class value_compare
+
+// REQUIRES: c++98 || c++03 || c++11 || c++14 || c++17
+
+#include <map>
+#include <string>
+
+#include "test_macros.h"
+
+int main(int, char**) {
+    typedef std::map<int, std::string> map_type;
+    typedef map_type::value_compare value_compare;
+    typedef map_type::value_type value_type;
+
+    ASSERT_SAME_TYPE(value_compare::result_type, bool);
+    ASSERT_SAME_TYPE(value_compare::first_argument_type, value_type);
+    ASSERT_SAME_TYPE(value_compare::second_argument_type, value_type);
+
+    return 0;
+}
Index: libcxx/test/std/containers/associative/multimap/multimap.observers/key_comp.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/std/containers/associative/multimap/multimap.observers/key_comp.pass.cpp
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// <map>
+
+// key_compare key_comp() const;
+
+#include <map>
+#include <cassert>
+#include <string>
+
+int main(int, char**) {
+    typedef std::multimap<int, std::string> map_type;
+
+    map_type m;
+    map_type::iterator i1 = m.insert(map_type::value_type(1, "abc"));
+    map_type::iterator i2 = m.insert(map_type::value_type(2, "abc"));
+
+    const map_type& cm = m;
+
+    assert(cm.key_comp()(i1->first, i2->first));
+    assert(!cm.key_comp()(i2->first, i1->first));
+}
Index: libcxx/test/std/containers/associative/multimap/multimap.observers/value_comp.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/std/containers/associative/multimap/multimap.observers/value_comp.pass.cpp
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// <map>
+
+// value_compare value_comp() const;
+
+#include <map>
+#include <cassert>
+#include <string>
+
+int main(int, char**) {
+    typedef std::multimap<int, std::string> map_type;
+
+    map_type m;
+    map_type::iterator i1 = m.insert(map_type::value_type(1, "abc"));
+    map_type::iterator i2 = m.insert(map_type::value_type(2, "abc"));
+
+    const map_type& cm = m;
+
+    assert(cm.value_comp()(*i1, *i2));
+    assert(!cm.value_comp()(*i2, *i1));
+}
Index: libcxx/test/std/containers/associative/multimap/multimap.value_compare/invoke.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/std/containers/associative/multimap/multimap.value_compare/invoke.pass.cpp
@@ -0,0 +1,47 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// <map>
+
+// class value_compare
+
+// bool operator()( const value_type& lhs, const value_type& rhs ) const;
+
+#include <map>
+#include <cassert>
+#include <string>
+#include <utility>
+
+template <typename MMap>
+struct CallCompMember : MMap::value_compare {
+    CallCompMember(const typename MMap::value_compare& vc) : MMap::value_compare(vc) {}
+
+    typedef typename MMap::value_type value_type;
+    bool operator()(const value_type& value1, const value_type& value2) const {
+        return this->comp(value1.first, value2.first);
+    }
+};
+
+int main(int, char**) {
+    typedef std::multimap<int, std::string> map_type;
+
+    map_type m;
+    map_type::iterator i1 = m.insert(map_type::value_type(1, "abc"));
+    map_type::iterator i2 = m.insert(map_type::value_type(2, "abc"));
+
+    map_type::value_compare vc = m.value_comp();
+    CallCompMember<map_type> call_comp = m.value_comp();
+
+    assert(vc(*i1, *i2));
+    assert(call_comp(*i1, *i2));
+
+    assert(!vc(*i2, *i1));
+    assert(!call_comp(*i2, *i1));
+
+    return 0;
+}
Index: libcxx/test/std/containers/associative/multimap/multimap.value_compare/types.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/std/containers/associative/multimap/multimap.value_compare/types.pass.cpp
@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// <map>
+
+// class value_compare
+
+// REQUIRES: c++98 || c++03 || c++11 || c++14 || c++17
+
+#include <map>
+#include <string>
+
+#include "test_macros.h"
+
+int main(int, char**) {
+    typedef std::multimap<int, std::string> map_type;
+    typedef map_type::value_compare value_compare;
+    typedef map_type::value_type value_type;
+
+    ASSERT_SAME_TYPE(value_compare::result_type, bool);
+    ASSERT_SAME_TYPE(value_compare::first_argument_type, value_type);
+    ASSERT_SAME_TYPE(value_compare::second_argument_type, value_type);
+
+    return 0;
+}