我们可以使用容器保存一组线程，如下面的vector装入一组线程：

#include <chrono>
#include <iostream>
#include <string>
#include <thread>
#include <vector>

void func(int n)
{
    std::string str = std::to_string(n);
    str += '\n';
    std::cout << str.c_str();
}

int main()
{
    std::cout << "Hello World!\n";

    std::vector<std::thread> thrds;
    for (int i = 0; i < 120; i++)
    {
        std::thread t(func, i);
        thrds.push_back(std::move(t));
    }

    for (size_t i = 0; i < thrds.size(); i++)
    {
        thrds[i].detach();
    }

    std::this_thread::sleep_for(std::chrono::seconds(6));
    std::cout << "that is ok" << std::endl;

    return 0;
}