Using a packaged_task - C++ Async

C++ examples for Async:Future

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Description

Using a packaged_task

Demo Code

#include <future>
#include <iostream>

using namespace std;

long long Factorial(unsigned int value)
{
    this_thread::sleep_for(chrono::seconds(2));
    return value == 1
        ? 1/*ww w. j  a v a 2  s  .co m*/
        : value * Factorial(value - 1);
}

int main(int argc, char* argv[])
{
    using namespace chrono;

    packaged_task<long long(unsigned int)> task{ Factorial };
    future<long long> taskFuture{ task.get_future() };

    thread taskThread{ std::move(task), 3 };

    while (taskFuture.wait_until(system_clock::now() + seconds(1)) != future_status::ready)
    {
        cout << "Still Waiting!" << endl;
    }

    cout << "Factorial result was " << taskFuture.get() << endl;

    taskThread.join();

    return 0;
}

Result


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