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Pointers, lifetime - Coggle Diagram

- - - - there can be only one
      - owns the pointed data exclusive
      - move transfers ownership
      - swap
      - reset and release but prefer move
      - :no_entry: can’t copy/assign
    - - multiple ok
      - reference counter
        
        count how shared ptrs many point to object
        
        pointed object lifetime ends when counter = 0
      - danger of circular pointers that are never deallocated after end of function
      - reset
      - shared_ptr<int> sp2 (sp1); // copy constructor
      - shared_ptr<int> sp4 (move(sp3)); // move constructor
      - copy and move assignment OK
    - - examines obj
      - doesn’t interfere with lifetime/ownership
      - compatible with shared pointers
        
        assigning a shared pointer to a weak pointer ok
      - reset and expired
      - :no_entry: can’t move
      - :red_cross: no * or -> operators