include iostream using namespace std class queue public queue queue qu

#include <iostream>

using namespace std;

class queue
{
public:
	queue();
	queue(queue& str);
	~queue();
	void push(const int v);
	void pop();
	bool isempty() const;
private:
	struct node
	{
		node* pPrev_;
		node* pNext_;
		int data_;
	};
	node* pHead_ = nullptr;
};
int main()
{
	queue a;
	return 0;
};

queue::queue() = default;

queue::~queue()
{
	while (isempty())
	{
		pop();
	} 
}

void
queue::push(const int v)
{
	node* pnew = new node;
	pnew->pNext_ = pHead_;
	pnew->data_ = v;
	pHead_ = pnew;
}

bool
queue::isempty() const
{
	return (nullptr == pHead_);
}

void
queue::pop()
{

}