| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // UNSUPPORTED: no-threads |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| |
| // <future> |
| |
| // template <class F, class... Args> |
| // future<typename result_of<F(Args...)>::type> |
| // async(F&& f, Args&&... args); |
| |
| // template <class F, class... Args> |
| // future<typename result_of<F(Args...)>::type> |
| // async(launch policy, F&& f, Args&&... args); |
| |
| |
| #include <future> |
| |
| int foo (int x) { return x; } |
| |
| void f() { |
| std::async( foo, 3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} |
| std::async(std::launch::async, foo, 3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} |
| } |
