thread_and_container.cpp

#include <iostream>
#include <thread>
#include <mutex>
#include <vector>

struct ThreadTest
{
    ThreadTest():
        threads_vector{10}
    {
        for(unsigned idx=0; idx!=threads_vector.size(); ++idx)
        {
            threads_vector[idx] =   std::thread{    [=]{print(idx);}    };
        }
    }

    ~ThreadTest()
    {
        wait_for_all_to_join();
    }

    void print(unsigned task_id)
    {
        std::lock_guard<std::mutex> lock{mutex};
        //! ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        //! grantee that only one thread is using ostream

        std::cout << "thread : " << task_id << std::endl;
    }

    static std::mutex mutex;
    std::vector<std::thread> threads_vector;

    void wait_for_all_to_join()
    {
        for(auto& t : threads_vector)   t.join();
    }
};

std::mutex ThreadTest::mutex;

int main()
{
    ThreadTest test;
    return 0;
}