test-example-projects/c++_projects/30wstarquant/cppsrc/log4cplus-2.0.4/threadpool/example.cpp

#include <iostream>
#include <vector>
#include <chrono>

#include "ThreadPool.h"

using namespace progschj;

int main()
{

    ThreadPool pool;
    std::vector< std::future<int> > results;

    for(int i = 0; i < 8; ++i) {
        results.emplace_back(
            pool.enqueue([i] {
                std::cout << "hello " << i << std::endl;
                std::this_thread::sleep_for(std::chrono::seconds(1));
                std::cout << "world " << i << std::endl;
                return i*i;
            })
        );
    }

    pool.wait_until_empty();
    pool.wait_until_nothing_in_flight ();

    for(auto && result: results)
        std::cout << result.get() << ' ';
    std::cout << std::endl;

    return 0;
}