class Iterator $\{$

public:

Node$*$ mCurr $=$ reinterpret$\_$cast$(-1)$;

Iterator& operator$++()$

$\{$

$\}$

Iterator operator$++($int$)$

$\{$

$\}$

Iterator& operator$--()\{$

$//$ TODO: Implement this method

$\}$

Iterator operator$--($int$)\{$

$//$ TODO: Implement this method

$\}$

Type& operator$*()\{$

$//$ TODO: Implement this method

$\}$

bool operator $!=($const Iterator& $\_$iter$)$ const $\{$

return mCurr $!=\_$iter.mCurr;

$\}$

$\}$;