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RD of circular singly linked list

This commit is contained in:
Shaun Reed 2020-04-30 15:01:14 -04:00
parent f37e863e3e
commit 87b3f5a394
4 changed files with 211 additions and 161 deletions
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10
plates/circlesinglelist/Makefile
View File

@ -5,15 +5,15 @@ CXXFLAGS=-g -Wall
# Driver
###############################################################################
driver: driver.cpp singlelist.o
${CXX} ${CXXFLAGS} driver.cpp singlelist.o -o driver
driver: driver.cpp circlesinglelist.o
${CXX} ${CXXFLAGS} driver.cpp circlesinglelist.o -o driver
###############################################################################
# SingleList
# CircleSingleList
###############################################################################
singlelist.o: singlelist.cpp singlelist.h
${CXX} ${CXXFLAGS} -c singlelist.cpp -o singlelist.o
circlesinglelist.o: circlesinglelist.cpp circlesinglelist.h
${CXX} ${CXXFLAGS} -c circlesinglelist.cpp -o circlesinglelist.o
###############################################################################
# Clean

313
plates/circlesinglelist/circlesinglelist.cpp
View File

@ -1,78 +1,79 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2020 Shaun Reed, all rights reserved ##
## About: An example of a singly linked list ##
## About: An example of a circular singly linked list ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com | GitHub: shaunrd0 ##
##############################################################################
## singlelist.cpp
## circlesinglelist.cpp
*/
#include "singlelist.h"
#include "circlesinglelist.h"
/******************************************************************************
* Constructors, Destructors, Operators
*****************************************************************************/
*****************************************************************************/
/** copy constructor
* @brief Construct a new SingleList::SingleList object from an existing one
*
* @param rhs SingleList object
* @brief Construct a new CircleSingleList::CircleSingleList object from an existing one
*
* @param rhs CircleSingleList object
*/
SingleList::SingleList(const SingleList& rhs)
CircleSingleList::CircleSingleList(const CircleSingleList& rhs)
{
Node *cp = rhs.head;
Node *tempHead;
if (cp == NULL) head = NULL;
Node *cp = rhs.tail;
Node *tempTail;
if (cp == NULL) tail = NULL;
else {
head = new Node(cp->data);
tempHead = head;
tail = new Node(cp->data);
tempTail = tail;
while (cp->next != NULL) {
cp = cp->next;
head->next = new Node(cp->data);
head = head->next;
tail->next = new Node(cp->data);
tail = tail->next;
}
head = tempHead;
tail = tempTail;
}
}
/** operator=
* @brief Assign two SingleList objects equal using copy constr and class destr
* Pass the rhs by value to create local copy, swap its contents
* Destructor called on previous SingleList data at the end of this scope
*
* @param rhs SingleList object passed by value
* @return SingleList A deep copy of the rhs SingleList object
* @brief Deep copy of the rhs CircleSingleList object
* Pass rhs by value to create local copy, swap its data with our tail
* Swapped local copy now with previous tail data deleted at end of scope using destr
*
* @param rhs CircleSingleList object
* @return CircleSingleList& A deep copy of the rhs CircleSingleList
*/
SingleList SingleList::operator=(SingleList rhs)
CircleSingleList CircleSingleList::operator=(CircleSingleList rhs)
{
if (this == &rhs) return *this;
std::swap(head, rhs.head);
else std::swap(tail, rhs.tail);
return *this;
}
/** destructor
* @brief Destroy the SingleList::SingleList object
* @brief Destroy the CircleSingleList::CircleSingleList object
*/
SingleList::~SingleList()
CircleSingleList::~CircleSingleList()
{
makeEmpty();
}
/******************************************************************************
* Public Member Functions
*****************************************************************************/
*****************************************************************************/
/** insert
* @brief Inserts a value to the head of our linked list
*
*
* @param x The value to be inserted
*/
bool SingleList::insert(int val)
bool CircleSingleList::insert(int val)
{
bool inserted = insert(val, head);
if (inserted)
std::cout << "[" << val << "] was inserted into the list\n";
bool inserted = insert(val, tail);
if (inserted) std::cout << "[" << val << "] was inserted into the list\n";
else std::cout << "[" << val << "] could not be inserted into the list\n";
return inserted;
}
@ -80,166 +81,196 @@ bool SingleList::insert(int val)
/** insert at
* @brief Inserts a value in the place of a given key
* Key Node found is moved to the newNode->next positon
*
*
* @param key The value to search for to determine insert location
* @param val The value to be inserted into the list
*/
bool SingleList::insert(int val, int key)
bool CircleSingleList::insert(int val, int key)
{
bool inserted = insert(val, key, head);
if (inserted)
std::cout << "[" << val << "] was inserted into the list\n";
if (isEmpty()) {
std::cout << "Cannot insert at an existing value using an empty list...\n";
return false;
}
bool inserted = insert(val, key, tail);
if (inserted) std::cout << "[" << val << "] was inserted into the list\n";
else std::cout << "[" << val << "] could not be inserted into the list\n";
return inserted;
}
/** remove
* @brief Removes a value in the list by calling a private member and handling output
*
*
* @param val Value to be removed from the list
* @return true If the value was removed from the list
* @return false If the value was not removed from the list
*/
bool SingleList::remove(int val)
bool CircleSingleList::remove(int val)
{
bool removed = remove(val, head);
if (removed)
std::cout << "[" << val << "] was removed from the list\n";
if (isEmpty()) {
std::cout << "Cannot remove any values from an empty list...\n";
return false;
}
bool removed = remove(val, tail);
if (removed) std::cout << "[" << val << "] was removed from the list\n";
else std::cout << "[" << val << "] could not be removed from the list\n";
return removed;
}
/** replace
* @brief Replaces a value in the list by calling a private member and handling output
*
*
* @param val Value to insert into the list
* @param key Value to be replaced within the list
* @return true If the key has been replaced in the list by val
* @return false If the key has not been replaced in the list by val
*/
bool SingleList::replace(int val, int key)
bool CircleSingleList::replace(int val, int key)
{
bool replaced = replace(val, key, head);
if (replaced)
std::cout << "[" << key << "] was replaced by [" << val << "] in the list\n";
else std::cout << "[" << key << "] could not be replaced by [" << val << "] in the list\n";
if (isEmpty()) {
std::cout << "Cannot replace any values from an empty list...\n";
return false;
}
bool replaced = replace(val, key, tail);
if (replaced) std::cout << "[" << key << "] was replaced by "
<< "[" << val << "] in the list\n";
else std::cout << "[" << key << "] could not be replaced by "
<< "[" << val << "] in the list\n";
return replaced;
}
/** makeEmpty
* @brief Empty this SingleList object, deleting all associated Nodes
* @brief Empty this CircleSingleList object, deleting all associated Nodes
*/
void SingleList::makeEmpty()
void CircleSingleList::makeEmpty()
{
Node *nextNode, *temp;
if (head == NULL) return;
nextNode = head->next;
delete head;
head = NULL;
while(nextNode != NULL) {
// If the list is empty
if (tail == NULL) return;
// If the list has members other than itself, keep a pointer to them
if (tail != tail->next) nextNode = tail->next;
// Delete the list nodes until we hit the tail
while(nextNode != tail) {
// Save pointer to delete previous node
temp = nextNode;
// Move to the next node
nextNode = nextNode->next;
// Delete the previous node and set it to NULL
delete temp;
temp = NULL;
}
// Always delete the tail node and set it to NULL
delete tail;
tail = NULL;
}
/** isEmpty
* @brief Determine if the SingleList is empty
*
* @return true If the SingleList::head is NULL
* @return false If the SingleList::head contains data
* @brief Determine if the CircleSingleList is empty
*
* @return true If the CircleSingleList::tail is NULL
* @return false If the CircleSingleList::tail contains data
*/
bool SingleList::isEmpty() const
bool CircleSingleList::isEmpty() const
{
return head == NULL;
return tail == NULL;
}
/** peek
* @brief returns the value at the SingleList::head
*
* @return int The value held at the Node pointed to by SingleList::head
* @brief return the value at the head of the list
*
* @return int The value held at the Node at the head of our linked list
*/
void SingleList::peek() const
void CircleSingleList::peek() const
{
if (!isEmpty())
std::cout << "[" << head->data << "] is at the top of our list\n";
// If there is only one data member, a circular list node will point to itself
if (!isEmpty())
std::cout << "[" << tail->next->data << "] is at the top of our list\n";
else std::cout << "Nothing to peek, our list is empty...\n";
}
/** print
* @brief Output the data held by the SingleList object
* @brief Output the data held by the CircleSingleList object
* Calls to the private print()
*/
void SingleList::print() const
void CircleSingleList::print() const
{
if(!isEmpty()) print(head);
// Print the list starting from the head node
if(!isEmpty()) print(tail->next);
else std::cout << "Nothing to print, our list is empty...\n";
}
/** find
* @brief Calls to the private member find() and handles return cases
*
* @param val The value to search for within our SingleList
* @return true If the value was found in this SingleList
* @return false If the value was not found in this SingleList
*
* @param val The value to search for within our CircleSingleList
* @return true If the value was found in this CircleSingleList
* @return false If the value was not found in this CircleSingleList
*/
bool SingleList::find(int val) const
bool CircleSingleList::find(int val) const
{
Node *result = find(val, head);
Node *result = find(val, tail);
if( result == NULL) {
std::cout << "[" << val << "] Was not found in our list\n";
return false;
}
std::cout << "[" << result->data << "] Was found in our list\n";
return true;
}
/******************************************************************************
* Private Member Functions
*****************************************************************************/
*****************************************************************************/
/** insert
* @brief Private member to handle inserting value into the list
*
*
* @param val Value to be inserted
* @param head The head of the list to insert the value into
* @param tail The tail of the list to insert the value into
* @return true If the value was inserted
* @return false If the value could not be inserted
*/
bool SingleList::insert(int val, Node *&head)
bool CircleSingleList::insert(int val, Node *&tail)
{
Node *newNode = new Node(val);
// If the list is not empty, update next pointer to head node
if (!isEmpty()) newNode->next = head;
if (!isEmpty()) newNode->next = tail->next;
else tail = newNode;
// Always set head to our newNode
head = newNode;
tail->next = newNode;
return true;
}
/** insert at
* @brief Private member to handle inserting a value at a key within our list
*
*
* @param val Value to be inserted
* @param key Key value to search for within the list
* @param head Head node of the list to insert to
* @param tail Tail node of the list to insert to
* @return true If the value was inserted
* @return false If the value was not inserted
*/
bool SingleList::insert(int val, int key, Node *&head)
bool CircleSingleList::insert(int val, int key, Node *&tail)
{
Node *newNode = new Node(val);
if (isEmpty()) return false;
// Let insert() handle inserting at the head
else if (head->data == key) return insert(val);
else if (tail->next->data == key) return insert(val);
Node *keyNode = findPrevious(key, head);
Node *keyNode = findPrevious(key);
// If there was no keyNode found, the key does is not in our list
// Don't insert anything, return false and let caller decide whats next
if (keyNode == NULL) return false;
// Set the newNode to come BEFORE our keyNode
// Set the newNode to come between the keyNode and the Node we are inserting at
// [keyNode]->[next]
// [keyNode]->[newNode]->[next]
// Where (keyNode->next->data == key) and keyNode is given by findPrevious()
newNode->next = keyNode->next;
keyNode->next = newNode;
return true;
@ -247,41 +278,60 @@ bool SingleList::insert(int val, int key, Node *&head)
/** remove
* @brief Private member to remove values from the list
*
*
* @param val Value to be removed
* @param head Head of the list to remove the value from
* @param tail Tail of the list to remove the value from
* @return true If the value has been removed from the list
* @return false If the value has not been removed from the list
*/
bool SingleList::remove(int val, Node *&head)
bool CircleSingleList::remove(int val, Node *&tail)
{
Node *exile, *tempHead;
Node *prevNode = findPrevious(val);
// If findPrevious returns NULL, the value was not found
if (prevNode == NULL) return false;
if (head == NULL) return false;
else if (head->data == val) {
head = head->next;
// If the node found is the only member of the list
if (prevNode == prevNode->next) {
// Delete, reset list to NULL
delete tail;
tail = NULL;
return true;
}
// If the node to remove is the tail and the list has > 1 members
else if (prevNode->next == tail) {
tempHead = tail->next;
exile = prevNode->next;
// Create the new tail
tail = prevNode;
// Link the head Node, skipping over the exile Node
tail->next = tempHead;
}
else {
// Get a ptr to the member we are removing from the list
exile = prevNode->next;
// Relink the list, skipping the exile node
prevNode->next = prevNode->next->next;
}
Node *prevNode = findPrevious(val, head);
if (prevNode == NULL) return false;
Node *gtfo = prevNode->next;
prevNode->next = prevNode->next->next;
delete gtfo;
// Delete the dangling ptr to the exile Node we removed from the list
delete exile;
exile = NULL;
return true;
}
/** replace
* @brief Private member to replace values within the list
*
*
* @param val Value to insert into the list
* @param key Value to be replaced within the list
* @param head Head of the list to replace the value
* @param tail Tail of the list to replace the value
* @return true If the key has been replaced by val within the list
* @return false If the key has not been replaced by val within the list
*/
bool SingleList::replace(int val, int key, Node *&head)
bool CircleSingleList::replace(int val, int key, Node *&tail)
{
Node *replacee = find(key, head);
Node *replacee = find(key, tail);
if (replacee == NULL) return false;
replacee->data = val;
return true;
@ -289,20 +339,20 @@ bool SingleList::replace(int val, int key, Node *&head)
/** find
* @brief Find and return a Node which contains the given value
*
* @param val The value to search for within our SingleList
* @return SingleList::Node* A pointer to the Node containing the search value
*
* @param val The value to search for within our CircleSingleList
* @param start The Node to begin the search at within the linked list, usually the head node
* @return CircleSingleList::Node* A pointer to the Node containing the search value
*/
SingleList::Node* SingleList::find(int val, Node *start) const
CircleSingleList::Node* CircleSingleList::find(int val, Node *start) const
{
// If given a NULL list, return NULL
// If given a head which contains the requested value, return the foundNode
if (start == NULL || start->data == val) return start;
Node *foundNode = start;
while (foundNode->next != NULL) {
foundNode = foundNode->next;
// Check the first Node, return if it is the value requested
if (start->data == val) return start;
Node *foundNode = start->next;
// Move through the list, checking each member until we reach the start Node
while (foundNode != start) {
if (foundNode->data == val) return foundNode;
foundNode = foundNode->next;
}
// If we have not yet returned a foundNode, the key is not in our list
return NULL;
@ -310,34 +360,39 @@ SingleList::Node* SingleList::find(int val, Node *start) const
/** findPrevious
* @brief Find and return the Node before a given value
*
* @param val The value to search for within our SingleList
* @return SingleList::Node* A pointer to the Node previous to the given value
*
* @param val The value to search for within our CircleSingleList
* @return CircleSingleList::Node* A pointer to the Node previous to the given value
*/
SingleList::Node* SingleList::findPrevious(int val, Node *start) const
CircleSingleList::Node* CircleSingleList::findPrevious(int val) const
{
if (isEmpty()) return NULL;
else if (start->data == val) return start;
else if (tail->next->data == val) return tail;
Node *temp = start;
while (temp->next != NULL) {
if (temp->next->data == val) return temp;
temp = temp->next;
// Create temp ptr to the head of our list
Node *tempHead = tail->next;
// Move through the list until we reach the head node again
while (tempHead->next != tail->next) {
// Check the value within the next node, if found return it
if (tempHead->next->data == val) return tempHead;
else tempHead = tempHead->next;
}
return NULL;
}
/** print
* @brief Output the contents of a SingleList from the given Node to NULL
*
* @brief Output the contents of a CircleSingleList until we hit a matching node
*
* @param start The Node to begin traversing output from
*/
void SingleList::print(Node *start) const
void CircleSingleList::print(Node *start) const
{
Node *temp = start;
std::cout << "List Contents: ";
while (temp != NULL) {
std::cout << "List Contents: " << temp->data << " | ";
temp = temp->next;
// Until we reach the start node again, print the list contents
while (temp != start) {
std::cout << temp->data << " | ";
temp = temp->next;
}

37
plates/circlesinglelist/circlesinglelist.h
View File

@ -1,29 +1,24 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2020 Shaun Reed, all rights reserved ##
## About: An example of a singly linked list ##
## ##
## Structure: Remove: Insert: Insert at: Replace: ##
## o-o-o-o-o-o o-o--x-->o-o-o o o o ##
## | /| / \ ##
## o-o-o-o-o-o o-o~o-o-o-o o-o~x~o-o-o ##
## About: An example of a circular singly linked list ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com | GitHub: shaunrd0 ##
##############################################################################
## singlelist.h
## circlesinglelist.h
*/
#ifndef LINKEDLIST_H
#define LINKEDLIST_H
#ifndef CIRCLESINGLELIST_H
#define CIRCLESINGLELIST_H
#include <iostream>
class SingleList{
class CircleSingleList{
public:
SingleList() : head(NULL) {};
SingleList(const SingleList& rhs);
SingleList operator=(SingleList rhs);
~SingleList();
CircleSingleList() : tail(NULL) {};
CircleSingleList(const CircleSingleList& rhs);
CircleSingleList operator=(CircleSingleList rhs);
~CircleSingleList();
bool insert(int val);
bool insert(int val, int key);
bool remove(int val);
@ -39,15 +34,15 @@ class SingleList{
int data;
Node *next;
Node(): data(), next(NULL) {};
Node(int val): data(val), next(NULL) {};
Node(int val): data(val), next(this) {};
};
Node *head;
bool insert(int val, Node *&head);
bool insert(int val, int key, Node *&head);
bool remove(int val, Node *&head);
bool replace(int val, int key, Node *&head);
Node *tail;
bool insert(int val, Node *&tail);
bool insert(int val, int key, Node *&tail);
bool remove(int val, Node *&tail);
bool replace(int val, int key, Node *&tail);
Node* find(int val, Node *start) const;
Node* findPrevious(int val, Node *start) const;
Node* findPrevious(int val) const;
void print(Node *start) const;
};

12
plates/circlesinglelist/driver.cpp
View File

@ -1,14 +1,14 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2020 Shaun Reed, all rights reserved ##
## About: A driver program to test a singly linked list ##
## About: A driver program to test a circular singly linked list ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com | GitHub: shaunrd0 ##
##############################################################################
## driver.cpp
*/
#include "singlelist.h"
#include "circlesinglelist.h"
#include <iostream>
enum OPS {
@ -19,14 +19,14 @@ int main()
{
std::cout << "Driver: \n";
SingleList testList;
CircleSingleList testList;
bool exit = false;
int choice = -1;
int val, key;
while (!exit)
{
std::cout << "##### Singly Linked List Menu #####\n\t0. Exit"
std::cout << "##### Circular Singly Linked List Menu #####\n\t0. Exit"
<< "\n\t1. Insert\n\t2. Insert at\n\t3. Empty list\n\t4. Peek top of list"
<< "\n\t5. Print list\n\t6. Find\n\t7. Remove\n\t8. Replace\n";
std::cin >> choice;
@ -51,7 +51,7 @@ int main()
std::cin >> key;
std::cin.clear();
if (testList.insert(val, key)) {
std::cout << "List after inserting ["
std::cout << "List after inserting ["
<< val << "] at [" << key << "]: \n";
testList.print();
}
@ -91,7 +91,7 @@ int main()
std::cin >> key;
std::cin.clear();
if (testList.replace(val, key)) {
std::cout << "List after replacing ["
std::cout << "List after replacing ["
<< key << "] by [" << val << "]: \n";
testList.print();
}