void make_ready_at_thread_exit( ArgTypes... args );
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(C++11 起) | |
以转发的 args
为参数调用存储的任务。任务返回值或任何抛出的异常被存储于 *this 的共享状态。
仅在当前线程退出,并销毁所有线程局域存储期对象后,才令共享状态就绪。
目录 |
args | - | 调用时传递给存储任务的参数 |
(无)
遇到下列条件时为 std::future_error :
#include <future> #include <iostream> #include <chrono> #include <thread> #include <functional> #include <utility> void worker(std::future<void>& output) { std::packaged_task<void(bool&)> my_task{ [](bool& done) { done=true; } }; auto result = my_task.get_future(); bool done = false; my_task.make_ready_at_thread_exit(done); // 立即执行任务 std::cout << "worker: done = " << std::boolalpha << done << std::endl; auto status = result.wait_for(std::chrono::seconds(0)); if (status == std::future_status::timeout) std::cout << "worker: result is not ready yet" << std::endl; output = std::move(result); } int main() { std::future<void> result; std::thread{worker, std::ref(result)}.join(); auto status = result.wait_for(std::chrono::seconds(0)); if (status == std::future_status::ready) std::cout << "main: result is ready" << std::endl; }
输出:
worker: done = true worker: result is not ready yet main: result is ready
执行函数 (公开成员函数) |