cpp/Multithreading/implementations/55-promise-future.cpp at master-cpp · 1aman1/cpp · GitHub

33 lines (23 loc) · 550 Bytes

#include <iostream>

#include <algorithm>

#include <vector>

#include <thread>

#include <chrono>

#include <mutex>

#include <future>

void thread_func(std::promise<int> &prmz, const int i)

{

std::this_thread::sleep_for(std::chrono::seconds(1));

prmz.set_value(i * i);

}

int main()

{

int var = 10;

std::promise<int> promise;

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

std::thread t1(thread_func, std::ref(promise), var);

std::cout << "waiting\n";

std::cout << future.get();

t1.join();

return 0;

}

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