Initial commit

module/jni/libcxx/test/std/containers/container.node/node_handle.nodiscard.verify.cpp

@@ -0,0 +1,52 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// Make sure the various node handles mark their .empty() method with
+// [[nodiscard]] starting with C++20
+
+#include <map>
+#include <set>
+#include <unordered_map>
+#include <unordered_set>
+
+void test() {
+    {
+        std::map<int, int>::node_type node;
+        node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+    }
+    {
+        std::multimap<int, int>::node_type node;
+        node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+    }
+    {
+        std::set<int> node;
+        node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+    }
+    {
+        std::multiset<int> node;
+        node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+    }
+    {
+        std::unordered_map<int, int> node;
+        node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+    }
+    {
+        std::unordered_multimap<int, int> node;
+        node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+    }
+    {
+        std::unordered_set<int> node;
+        node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+    }
+    {
+        std::unordered_multiset<int> node;
+        node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+    }
+}