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C++11 arrived with std::thread and related classes built within the standard. With the move semantics in place, the construction and assignment practices of 'std threads' deserve a small write up. Let's define a 'Runnable' first: class Runnable {    public:       virtual void operator ()() = 0;       virtual ~Runnable(){} }; class Task : Runnable {      public:          void operator ()()          {               //do sth here..          } };                                                 //later..      #include <thread>     Task runnable;     std::thread t1; //not attached to any thread                                                 std::thread t2 ( runnable ); //attached and running   Copy Construction of std::thread is not allowed            std::thread t3 ( t2 ); // compilation error            std::thread t4 = t2; // compilation error error : use of deleted function std::thread (const std::th