30 lines
1 KiB
C++
30 lines
1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: no-threads
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <future>
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// template <class F, class... Args>
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// future<typename result_of<F(Args...)>::type>
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// async(F&& f, Args&&... args);
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// template <class F, class... Args>
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// future<typename result_of<F(Args...)>::type>
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// async(launch policy, F&& f, Args&&... args);
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#include <future>
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int foo (int x) { return x; }
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void f() {
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std::async( foo, 3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
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std::async(std::launch::async, foo, 3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
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}
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