1 // -*- C++ -*-
2 //===----------------------------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <queue>
11 
12 // class priority_queue
13 
14 // bool empty() const noexcept;
15 
16 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
17 // REQUIRES: verify-support
18 
19 #include <queue>
20 
21 #include "test_macros.h"
22 
23 int main(int, char**)
24 {
25     std::priority_queue<int> c;
26     c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
27 
28     return 0;
29 }
30