IteratorExample.cpp

#include <stdio.h>

class Table {
  friend class Iterator;

public:
  Table(int x, int y, int z, int w)
  {
    mArray[0] = x;
    mArray[1] = y;
    mArray[2] = z;
    mArray[3] = w;
  }

  class Iterator {
    friend class Table;

  public:
    Iterator(Iterator&& aOther)
    : mCurrent(aOther.mCurrent),
      mEnd(aOther.mEnd) {
      aOther.mCurrent = 0;
      aOther.mEnd = 0;
    }

    bool Done() const { return mCurrent == mEnd; }
    void Next() { ++mCurrent; }
    int Get() const { return *mCurrent; }

  private:
    Iterator(Table* aTable) {
      mCurrent = &aTable->mArray[0];
      mEnd = &aTable->mArray[3] + 1;
    }

  private:
    int* mCurrent;
    int* mEnd;

    Iterator() = delete;
    Iterator(const Iterator&) = delete;
    Iterator& operator=(const Iterator&) = delete;
  };

  Iterator Iter() { return Iterator(this); }

private:

  int mArray[4];
};

void
Example()
{
  Table t(6, 11, 21, 18);

  for (auto iter = t.Iter(); !iter.Done(); iter.Next()) {
    int x = iter.Get();
    printf("%d\n", x);
  }
}