24 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8// UNSUPPORTED: c++03, c++11, c++14, c++179 10// <span>11 12// [[nodiscard]] constexpr bool empty() const noexcept;13 14#include <span>15 16void test() {17 std::span<int> s1;18 s1.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}19 20 int arr[] = {1, 2, 3};21 std::span<int, 3> s2{arr};22 s2.empty(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}23}24