//===----------------------------------------------------------------------===// // // 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. // //===----------------------------------------------------------------------===// // <future> // class promise<R> // void promise<R&>::set_value_at_thread_exit(R& r); #include <future> #include <memory> #include <cassert> int i = 0; void func(std::promise<int&> p) { p.set_value_at_thread_exit(i); i = 4; } int main() { { std::promise<int&> p; std::future<int&> f = p.get_future(); std::thread(func, std::move(p)).detach(); assert(f.get() == 4); } }