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#include <iostream>

#include <cmath>

#include <thread>

#include <future>

#include <functional>

// unique function to avoid disambiguating the std::pow overload set

int f(int x, int y)

{

std::cout << "f " << std::this_thread::get_id() << std::endl;

std::this_thread::sleep_for(std::chrono::seconds(5));

return std::pow(x,y);

}

void task_lambda()

{

std::packaged_task<int(int,int)> task([](int a, int b)

{

std::cout << "lamda " << std::this_thread::get_id() << std::endl;

std::this_thread::sleep_for(std::chrono::seconds(2));

return std::pow(a, b);

});

std::future<int> result = task.get_future();

std::cout << "future" << std::endl;

task(2, 9);

std::cout << "task_lambda:\t" << result.get() << '\n';

}

void task_bind()

{

std::packaged_task<int()> task(std::bind(f, 2, 11));

std::future<int> result = task.get_future();

task();

std::cout << "task_bind:\t" << result.get() << '\n';

}

void task_thread()

{

std::packaged_task<int(int,int)> task1(f);

std::future<int> result = task1.get_future();

std::thread task_td(std::move(task1), 2, 10);

task_td.join();

std::cout << "task_thread:\t" << result.get() << '\n';

}

int main()

{

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

//task_lambda();

//task_bind();

task_thread();

auto fff = std::bind(f, 2, 11);

}