/*
 * SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Unlicense OR CC0-1.0
 */
#include <iostream>
#include <future>
#include <thread>
#include "unity.h"

#if __GTHREADS && __GTHREADS_CXX0X
TEST_CASE("C++ future", "[std::future]")
{
    // future from a packaged_task
    std::packaged_task<int()> task([] { return 7; }); // wrap the function
    std::future<int> f1 = task.get_future();  // get a future
    std::thread t(std::move(task)); // launch on a thread

    // future from an async()
    std::future<int> f2 = std::async(std::launch::async, [] { return 8; });

    // future from a promise
    std::promise<int> p;
    std::future<int> f3 = p.get_future();
    std::thread([&p] { p.set_value_at_thread_exit(9); }).detach();

    std::cout << "Waiting..." << std::flush;
    f1.wait();
    f2.wait();
    f3.wait();
    std::cout << "Done!\nResults are: "
              << f1.get() << ' ' << f2.get() << ' ' << f3.get() << '\n';
    t.join();
}
#endif
