While working with the threaded model of C++11, I noticed that std::packaged_task<int(int,int)> task([](int a, int b) { return a + b; }); auto f = task.get_future(); task(2,3); std::cout &lt...

class MoveOnlyOperation { public: MoveOnlyOperation() = default; MoveOnlyOperation(const MoveOnlyOperation&) = delete; MoveOnlyOperation(MoveOnlyOperation&&) = default; int operato...

I got to know the reason that future returned from std::async has some special shared state through which wait on returned future happened in the destructor of future. But when we use std::pakaged_...

I have been trying to capture packaged_task into lambda, but I've failed. I understand move-semantics at all, also read some modern literature and I was thinking I didn't miss anything. Also I hav...

I am analysing the following code snippet and am trying to understand it in detail: template<typename FUNCTION, typename... ARGUMENTS> auto ThreadPool::add( FUNCTION&& Function, ARGU...

Is it safe to create a std::future from a std::packaged_task, which executes on a separate thread, but not always retrieve its result? #include <future> #include <thread> class Result...

I've been trying more about multi threaded programming in c++, and i was having difficulty understanding std::promise so i began searching for answers on this website, and low and behold, there is ...

I want to create a thread pool for experimental purposes (and for the fun factor). It should be able to process a wide variety of tasks (so I can possibly use it in later projects). In my threa...

I recently ran valgrind --tool=helgrind on my project and got a warning "possible data race", which I thought was concerning. However, even this simple test program leads to this message: #include...

I'm encountering something very weird when using packaged tasks. When reading ~packaged_task I get the impression that if a std::packaged_task is destroyed before it is executed, the promise will b...

When should I use std::promise over std::async or std::packaged_task? Can you give me practical examples of when to use each one of them?

Using MSVC2012, The following code will compile and run as expected std::packaged_task< int() > task( []()->int{ std::cout << "hello world" << std::endl; return 0; } ); std::...

My assumption is that packaged_task has a promise underneath. If my task throws an exception, how do I route that to the associated future? With just a promise I could call set_exception – how do ...

It seems that unless you call std::async a std::future will never be set to any other state than future_status::deferred unless you call get or wait on the future. wait_for & wait_until will co...

Following this excellent tutorial for futures, promises and packaged tasks I got to the the point where I wanted to prepare my own task #include <iostream> #include <future> using name...