| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // UNSUPPORTED: no-threads |
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| 10 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 11 | |
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| 12 | // <future> |
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| 13 | |
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| 14 | // template <class F, class... Args> |
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| 15 | // future<typename result_of<F(Args...)>::type> |
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| 16 | // async(F&& f, Args&&... args); |
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| 17 | |
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| 18 | // template <class F, class... Args> |
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| 19 | // future<typename result_of<F(Args...)>::type> |
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| 20 | // async(launch policy, F&& f, Args&&... args); |
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| 21 | |
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| 22 | |
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| 23 | #include <future> |
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| 24 | |
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| 25 | int foo (int x) { return x; } |
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| 26 | |
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| 27 | void f() { |
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| 28 | std::async( fn&: foo, args: 3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} |
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| 29 | std::async(policy: std::launch::async, fn&: foo, args: 3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} |
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| 30 | } |
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| 31 | |
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