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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..          } };                                           ...