(sentry head node)
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Transcribed Image Text:class LinkedList;
A7 A
template<class T>
class ListNode {
friend class LinkedList<T>;
private:
I val;
ListNode *next;
public:
ListNode () : next(nullptr) {}
ListNode(T val) : val(val), next(nullptr) {}
};
template<class T>
class LinkedList : public List<T> {
private:
ListNode<T> *head; // this implementation has a dummy head (sentry head node)
size_t num_of_element;
public:
LinkedList () {
head = new ListNode<T>);
num_of_element = 0;
LinkedList(size_t capacity) : LinkedList<T>() {} // to make test consistent
// copy constructor
• LinkedList (const LinkedList<T> &other_list) : LinkedList() {
// destructor
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