1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03 10 // UNSUPPORTED: (c++11 || c++14 || c++17) && !stdlib=libc++ 11 12 // Make sure the various node handles mark their .empty() method with 13 // [[nodiscard]] starting with C++20 14 15 #include <map> 16 #include <set> 17 #include <unordered_map> 18 #include <unordered_set> 19 20 #include "test_macros.h" 21 test()22void test() { 23 #if TEST_STD_VER >= 17 24 { 25 std::map<int, int>::node_type node; 26 node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} 27 } 28 { 29 std::multimap<int, int>::node_type node; 30 node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} 31 } 32 #endif // TEST_STD_VER >= 17 33 { 34 std::set<int> node; 35 node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} 36 } 37 { 38 std::multiset<int> node; 39 node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} 40 } 41 { 42 std::unordered_map<int, int> node; 43 node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} 44 } 45 { 46 std::unordered_multimap<int, int> node; 47 node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} 48 } 49 { 50 std::unordered_set<int> node; 51 node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} 52 } 53 { 54 std::unordered_multiset<int> node; 55 node.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} 56 } 57 } 58