using std::thread std::mutex std::lock_guard in the same class

thread_and_mutex_as_class_data_member.cpp

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

struct ThreadTest
{
    ThreadTest():
        t1{[this]{  print(1);}  },
        t2{[this]{  print(2);}  }
    {}

    ~ThreadTest()
    {
        wait_for_all_to_join();
    }

    void print(unsigned task_id)
    {
        std::lock_guard<std::mutex> lock{mutex};
        std::cout << "thread : " << task_id << std::endl;
    }

    static std::mutex mutex;
    std::thread t1;
    std::thread t2;

    void wait_for_all_to_join()
    {
        t1.join();
        t2.join();
    }
};
std::mutex ThreadTest::mutex;

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