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New Features (auto (explicit a variable should have automatic declaration,…

- - - - prevent copy
      - use std::move to transfer ownership to the other
      - exp:
        std::unique_ptr<int> p1(new int(5));
        std::unique_ptr<int> p3 = std::move(p1);// p1 now is nullptr
        p3.reset()
    - - using reference counting
      - std::shared_ptr<int[]> p1(new int[5]); // valid, allocates 5 integers
        std::shared_ptr<int[]> p2 = p1; //Both now own the memory.
    - - is created as a copy of a shared_ptr
      - After all copies of a shared_ptr have been destroyed, all weak_ptr copies become empty
      - Exp:
        std::shared_ptr<int> p1(new int(5));
        std::weak_ptr<int> wp1 = p1; //p1 owns the memory.
        std::shared_ptr<int> p2 = wp1.lock(); //Now p1 and p2 own the memory.
        if(p2) {...}//As p2 is initialized from a weak pointer, you have to check if the memory still exists!
    - - reset