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author | Marshall Clow <mclow.lists@gmail.com> | 2017-11-23 01:25:03 +0000 |
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committer | Marshall Clow <mclow.lists@gmail.com> | 2017-11-23 01:25:03 +0000 |
commit | 70c7bbd04fd2833a340238ea70f89ba12666c431 (patch) | |
tree | 8f2f9802a7cb910e38ffd07e0d389033a07964f8 /test | |
parent | 18a268580952c47fac35e1e46bd9973058ef7352 (diff) |
Add [[nodiscard]] to std::async as part of P0600.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@318889 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
-rw-r--r-- | test/std/thread/futures/futures.async/async.fail.cpp | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/test/std/thread/futures/futures.async/async.fail.cpp b/test/std/thread/futures/futures.async/async.fail.cpp new file mode 100644 index 000000000..1a719c0fd --- /dev/null +++ b/test/std/thread/futures/futures.async/async.fail.cpp @@ -0,0 +1,37 @@ +//===----------------------------------------------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is dual licensed under the MIT and the University of Illinois Open +// Source Licenses. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// UNSUPPORTED: libcpp-has-no-threads +// UNSUPPORTED: c++98, c++03 + +// <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> +#include <atomic> +#include <memory> +#include <cassert> + +#include "test_macros.h" + +int foo (int x) { return x; } + +int main () +{ + std::async( foo, 3); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}} + std::async(std::launch::async, foo, 3); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}} +}
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