What is the "data" member mean?


  • 1
    E

    I don't know what is the "*data" used for?
    Can someone give some detail explanation?

    class Iterator {
    struct Data;
    Data* data;
      public:
    Iterator(const vector<int>& nums);
    Iterator(const Iterator& iter);
    virtual ~Iterator();
    // Returns the next element in the iteration.
    int next();
    // Returns true if the iteration has more elements.
    bool hasNext() const;
    };

  • 1
    B

    I think you need not consider what the "Data" types means. You need just operate the method provided in the class Iterator.


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