std::future - cppreference.com std::promise - cppreference.com https://en.cppreference.com/w/cpp/thread/packaged_task
If theasyncflag is set, i.e.(policy&std::launch::async)!=0, thenstd::asynccalls INVOKE(decay-copy(std::forward<F>(f)), decay-copy(std::forward<Args>(args))...) (until C++23) std::invoke(auto(std::forward<F>(f)), auto(std::forward<Args>(args))...) ...
std::ref(promise));do_some_other_things();std::cout<<result.get()<<std::endl;th.join();...
如果超时了就标记timeout中断上报流程。 按照https://en.cppreference.com/w/cpp/thread/async和https://en.cppreference.com/w/cpp/thread/future/%7Efuture的对标准的描述。 Async invocation If the async flag is set (i.e. (policy & std::launch::async) != 0), thenstd::asynccallsINVOKE(decay-...
<typename CompletionToken> void(), token,std::ref(resolver), 浏览4提问于2020-11-02得票数 1 1回答 c++未解析标识符的未来 这是我的教程代码:#include <iostream> //std::coutbool is_prime (int x) {
std::future<int> fu = std::async(sums,3,4,5);//std::future<int> fu = std::async(sum,std::ref(x),std::ref(y));std::cout << fu.get() << std::endl;//获取当前计算机线程数量std::cout << std::thread::hardware_concurrency() << std::endl;//获取当前线程IDstd::cout << ...
std::threadt2(get_task_value, std::ref(future));// 获取线程函数值的线程 t1.join(); t2.join(); return0; } 可以通过查询future的状态来获取异步任务的执行情况,例如,可以在上面的代码中添加future的状态查询,直到任务完成为止。 future的状态为 future_status , 共有三种状态: ...
Exception thrown at 0x00007FFC0323A799 in cpptests.exe: Microsoft C++ exception: std::bad_alloc at memory location 0x000000F77DEFEF20. This is because in nameCallback we try to access a member of the User structure. However, since the object of this type was deleted (via pJohn.reset...
void test() { //封装一个异步操作 std::packaged_task<int()> task([]() { std::this_thread::sleep_for(std::chrono::seconds(5)); return 7; }); std::thread t1(std::ref(task)); std::future<int> f1 = task.get_future(); std::cout << "Waiting..." << std::endl; std::fu...