C++11 package_task

#include "iostream"
#include"utility"
#include "future"
#include "thread"

using namespace std;


// 在新线程中启动一个 int(int) packaged_task.
std::future<int> launcher(std::packaged_task<int(int)>& tsk, int arg)
{
    if (tsk.valid()) {
        std::future<int> ret = tsk.get_future();
        std::thread (std::move(tsk),arg).detach();
        return ret;
    }
    else return std::future<int>();
}



int main()
{
    std::packaged_task<int(int)> foo;
    std::packaged_task<int(int)> bar([](int x){return x*2;});

    foo = std::move(bar);

    auto ret = foo.get_future();
    std::thread(std::move(foo),10).detach();

    int value = ret.get();

    cout << "value: " <<value <<endl;


    std::packaged_task<int(int)> bar1([](int x){return x*2;});
    auto fut = launcher(bar1,25);

    cout << "fut.get: " << fut.get() << endl;

    getchar();
    return 0;
}