Using async to Call Functions - C++ Async

C++ examples for Async:async

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Description

Using async to Call Functions

Demo Code

#include <future>
#include <iostream>

using namespace std;

long long Factorial(unsigned int value)
{
    cout << "ThreadTask thread: " << this_thread::get_id() << endl;
    return value == 1
        ? 1/*from  w ww.j  av  a  2s . c  o m*/
        : value * Factorial(value - 1);
}

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

    cout << "main thread: " << this_thread::get_id() << endl;

    auto taskFuture1 = async(Factorial, 3);
    cout << "Factorial result was " << taskFuture1.get() << endl;

    auto taskFuture2 = async(launch::async, Factorial, 3);
    cout << "Factorial result was " << taskFuture2.get() << endl;

    auto taskFuture3 = async(launch::deferred, Factorial, 3);
    cout << "Factorial result was " << taskFuture3.get() << endl;

    auto taskFuture4 = async(launch::async | launch::deferred, Factorial, 3);
    cout << "Factorial result was " << taskFuture4.get() << endl;

    return 0;
}

Result


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