File: empty.verify.cpp

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

// <unordered_set>

// class unordered_set

// bool empty() const noexcept;

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

#include <unordered_set>

#include "test_macros.h"

int main(int, char**)
{
    std::unordered_set<int> c;
    c.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}

    return 0;
}