class Sentinel{
	struct Node{
	T data_;
	Node* next_;
	Node* prev_;
	Node(const T& data=T{},Node* next=nullptr, Node* prev=nullptr){
	data_=data;
	next_=next;
	prev_=prev;
	}
	};
	Node* front_;
	Node* back_;
	public:
	Sentinel(){
	front_=new Node();
	back_=new Node();
	front_->next_=back_;
	back_->prev_=front_;
	}
	void push_front(const T& data);
	void push_back(const T& data);
	void pop_front();
	void pop_back();
	int getData(int data[]) const;
	int getReverseData(int data[]) const;
	~Sentinel();
	};
	template
	void Sentinel::push_front(const T& data){
	}
	template
	void Sentinel::push_back(const T& data){
	}
	template
	void Sentinel::pop_front(){
	}
	template
	void Sentinel::pop_back(){
	}
	template
	int Sentinel::getData(int data[]) const{
	Node* curr=front_->next_;
	int numData=0;
	while(curr!=back_){
	data[numData++]=curr->data_;
	curr=curr->next_;
	}
	return numData;
	}
	template
	int Sentinel::getReverseData(int data[]) const{
	Node* curr=back_->prev_;
	int numData=0;
	while(curr!=front_){
	data[numData++]=curr->data_;
	curr=curr->prev_;
	}
	return numData;
	}
	template
	Sentinel::~Sentinel(){
	}

Complete the push_front(), push_back(), pop_front(),pop_back() and destructor functions for Sentinel class.

Please answer the above question in C++ code language, thank you!