39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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, c++11, c++14, c++17
|
|
// UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8
|
|
|
|
// <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}}
|
|
}
|