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erations. (a) A default constructor that creates an empty queue. (b) A method size () that returns the number of elements in the queue (c) A method empty() that returns true if the queue is empty. (d) A method push (e) that adds a copy of elemente to the back of the queue. (e) A method pop () that removes the front element of the queue. A copy of that element is also returned. The easiest way to implement this class is to use an STL list to store the elements of the queue. But for the purposes of this assignment, you ar not allowed to do that. Instead, you have to directly use a singly-linked list that is, a linked list in which each node has only one pointer. Implement the Queue operations as efficiently as possible. Most opera tions can be implemented to run in constant time.

erations. (a) A default constructor that creates an empty queue. (b) A method size () that returns the number of elements in the queue (c) A method empty() that returns true if the queue is empty. (d) A method push (e) that adds a copy of elemente to the back of the queue. (e) A method pop () that removes the front element of the queue. A copy of that element is also returned. The easiest way to implement this class is to use an STL list to store the elements of the queue. But for the purposes of this assignment, you ar not allowed to do that. Instead, you have to directly use a singly-linked list that is, a linked list in which each node has only one pointer. Implement the Queue operations as efficiently as possible. Most opera tions can be implemented to run in constant time.

Database System Concepts
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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C++

A queue is essentially a waiting list. It’s a sequence of elements with a front and a back. Elements can only be added to the back of the queue and they can only be removed from the front of the queue. Elements are kept in order so that the first element to enter the queue is the first one to leave it.

Create a generic class of queues called Queue. Include the following op- erations. (a) A default constructor that creates an empty queue. (b) A method size () that returns the number of elements in the queue. (c) A method empty () that returns true if the queue is empty. (d) A method push (e) that adds a copy of element e to the back of the queue. (e) A method pop () that removes the front element of the queue. A copy of that element is also returned. The easiest way to implement this class is to use an STL list to store the elements of the queue. But for the purposes of this assignment, you are not allowed to do that. Instead, you have to directly use a singly-linked list, that is, a linked list in which each node has only one pointer. Implement the Queue operations as efficiently as possible. Most opera- tions can be implemented to run in constant time. Split your class into header and implementation file in the usual way. Sub- mit your test driver.
Transcribed Image Text:Create a generic class of queues called Queue. Include the following op- erations. (a) A default constructor that creates an empty queue. (b) A method size () that returns the number of elements in the queue. (c) A method empty () that returns true if the queue is empty. (d) A method push (e) that adds a copy of element e to the back of the queue. (e) A method pop () that removes the front element of the queue. A copy of that element is also returned. The easiest way to implement this class is to use an STL list to store the elements of the queue. But for the purposes of this assignment, you are not allowed to do that. Instead, you have to directly use a singly-linked list, that is, a linked list in which each node has only one pointer. Implement the Queue operations as efficiently as possible. Most opera- tions can be implemented to run in constant time. Split your class into header and implementation file in the usual way. Sub- mit your test driver.
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