third_party/llvm-project/libcxx/test/std/containers/container.adaptors/queue/queue.defn/empty.verify.cpp

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// <queue>

// class queue

// bool empty() const noexcept;

// UNSUPPORTED: c++03, c++11, c++14, c++17

#include <queue>

void f() {
    std::queue<int> c;
    c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
}