The document is a C++ program implementing a simple text editor with basic functionalities such as inserting, deleting, and saving lines of text from a file. It includes commands for interacting with the user, displaying help, and checking file validity. Essential classes and methods are defined for file management, line manipulation, and list handling.

1. #include
#include
#include
#include
#include "textFile.hpp"
using namespace std;
void displayHelp();
bool isInteger(const string &s);
bool askSave();
int main(int argc, const char * argv[]) {
int resultCode = 0;
// Convert to a vector.
vector args(argv, argv + argc);
// Process arguments, must be 1 argument, otherwise exit with code 1.
if (args.size() < 2) {
cout << "Missing command line argument!" << endl;
cout << "Usage: ./myEditor " << endl;
resultCode = 1;
} else {
string fileName = args[1];
textFile dataFile(fileName);
// Check if the file is ok to use, if it is, lets go.
if (!dataFile.checkFile()) {
resultCode = 2;
} else {
// We can now assume the file is good, so we can work with it.
dataFile.loadFile();
// Display some text to help the user.
displayHelp();

2. // Now get user input.
bool done = false;
string userInput = "";
while (!done) {
cout << "> ";
getline(cin, userInput);
char cmd = tolower(userInput.c_str()[0]);
char cmd2 = ' ';
if (userInput.size() > 1) {
cmd2 = userInput.c_str()[1];
}
// This check makes sure the command format is correct
// so that commands don't fire off by mistake.
if (strncmp(&cmd, " ", 1) != 0 && strncmp(&cmd2, " ", 1) == 0) {
switch(cmd) {
case 'q': {
done = true;
break;
}
case 'i': {
unsigned long lineIndex = dataFile.textLines() + 1;
string newLine;
if (userInput.size() > 1) {
string cmdArg = userInput.substr(2);
lineIndex = stol(cmdArg);
}
cout << to_string(lineIndex) << "> ";
getline(cin, newLine);
dataFile.insertLine(lineIndex - 1, newLine);
break;
}
case 'd': {
if (userInput.size() > 1) {

3. unsigned long lineIndex;
string cmdArg = userInput.substr(2);
lineIndex = stol(cmdArg);
dataFile.removeLine(lineIndex - 1);
}
break;
}
case 'l': {
for (int x = 0; x < dataFile.textLines(); x++) {
cout << to_string(x + 1) << "> " << dataFile.getLine(x) << endl;
}
break;
}
case 'h': {
displayHelp();
break;
}
case 's': {
dataFile.saveFile();
break;
}
}
}
}
// Ask about saving the file before exiting.
bool save = askSave();
if (save) {
dataFile.saveFile();
}
cout << "Thank you for using myEditor." << endl;
}
}
return resultCode;
}

4. /*
Asks the user if they'd like to save or not, returns true if they do. Anything
other than "y" or "Y" will be interpreted as a negative answer.
*/
bool askSave()
{
bool result = false;
string userInput = "";
cout << "Do you wan to save the change? (Y - yes; N - no) ";
getline(cin, userInput);
userInput = tolower(*userInput.c_str());
if (strncmp(userInput.c_str(), "y", 1) == 0) {
result = true;
}
return result;
}
/*
Displays help text.
*/
void displayHelp()
{
cout << "Welcome to my text editor." << endl;
cout << "tTo insert text at the end of the file, type 'I'" << endl;
cout << "followed by the text." << endl;
cout << "tTo insert text at a certain line number, type 'I'" << endl;
cout << "followed by a space and the desired line number." << endl;
cout << "tTo delete a line, type 'D' followed by a space and the" << endl;
cout << "line number." << endl;
cout << "tTo print all the lines, type 'L' and press enter." << endl;
cout << "tTo save the current content, type 'S' and press enter." << endl;
cout << "tTo display this introduction, type 'H' and press" << endl;
cout << "enter." << endl;
cout << "tTo quit, type 'Q' and press enter." << endl;
}
/*
Checks to see if a stirng is an integer, returns true if the string is an

5. integer, returns false it it is not.
*/
bool isInteger(const string &s)
{
char *p;
strtol(s.c_str(), &p, 10);
return (*p == 0);
}
textFile.hpp
#ifndef textFile_hpp
#define textFile_hpp
#include
#include
#include "simpleList.hpp"
using namespace std;
class textFile {
private:
simpleList lines; // Stores all lines of the file.
string fileName; // The name of the file being accessed.
ifstream inputHandle; // File object for reading data from the file.
ofstream outputHandle; // File object for writing data to the file.
public:
textFile(); // Default Constructor
textFile(string file); // Constructor
~textFile(); // Destructor
unsigned long textLines(); // Size of the text file in # of lines.
string getLine(unsigned long lineNumber); // One line of text from the file.
void setLine(unsigned long lineNumber, string data); // Sets a specific line to a new value.
void insertLine(unsigned long lineNumber, string data); // Inserts a line into the file.
void removeLine(unsigned long lineNumber); // Removes a line from the file.
bool checkFile(); // Checks to see if a file is good.
void loadFile(); // Loads all the data into the object of the text file in question.
void saveFile(); // Saves all the data in the object back to its file.
void setFile(string file); // Allows setting of the file name after object creation.
string getFile(); // Returns the name of the file being worked with.
};

6. #endif /* textFile_hpp */
textFile.cpp
#include
#include "textFile.hpp"
#include "simpleList.hpp"
using namespace std;
/*
Default constructor for textFile class.
*/
textFile::textFile()
{
fileName = "";
}
/*
Constructor that accepts the file name in the object creation.
*/
textFile::textFile(string file)
{
fileName = file;
}
/*
Destructor function, no action required at this tiem.
*/
textFile::~textFile()
{
// Nothing for here.
}
unsigned long textFile::textLines()
{
return lines.size();
}
string textFile::getLine(unsigned long lineNumber)
{
// Check to make sure we're not going to go out of bounds.
if (lineNumber < lines.size()) {

7. lines.toHead();
lines.forward(lineNumber);
return lines.current()->data();
} else {
// If the index of lines to return is out of bounds, return an empty
// string.
string noData = "";
return noData;
}
}
void textFile::setLine(unsigned long lineNumber, string data)
{
if (lines.size() > lineNumber) {
lines.toHead();
lines.forward(lineNumber);
lines.current()->data(data);
} else {
lines.toTail();
lines.current()->data(data);
}
}
/*
Inserts a new line into the lines vector with data.
*/
void textFile::insertLine(unsigned long lineNumber, string data)
{
if (lines.size() > lineNumber) {
lines.toHead();
lines.forward(lineNumber);
lines.insert(data);
} else {
// This will add enough lines to get to lineNumber x even if there are
// not enough lines.
unsigned long blanks = lineNumber - lines.size();
if (blanks > 0) {
string blankString = "";

8. for (unsigned int x; x < blanks; x++) {
lines.append(blankString);
}
}
lines.append(data);
}
}
/*
Removes a line from the lines vector.
*/
void textFile::removeLine(unsigned long lineNumber)
{
lines.toHead();
lines.forward(lineNumber);
lines.remove();
}
/*
Checks to see if the file is good to read/write from.
*/
bool textFile::checkFile()
{
// Open the file as if we want to read it.
inputHandle.open(fileName);
// Check to see if the file access is good.
bool result = inputHandle.good();
// Close the file.
inputHandle.close();
return result;
}
void textFile::loadFile()
{
// Make sure we start with a blank slate, no items in the vector.
if (lines.size() > 0)
{
lines.clear();
}

9. // Open up the file for reading.
string line;
inputHandle.open(fileName.c_str());
// Read every line until end of file.
while (!inputHandle.eof()) {
getline(inputHandle, line);
lines.append(line);
}
if (line == "") {
lines.toTail();
lines.remove();
}
// Make sure to close the file again.
inputHandle.close();
}
/*
Saves all lines in the lines vector to the file.
*/
void textFile::saveFile()
{
// Open the file for writing, this should erase an exiting file.
outputHandle.open(fileName.c_str());
// Write every line from the lines vector into the file, appending
// a new line to the end of each.
lines.toHead();
while (lines.current()->next() == nullptr) {
outputHandle << lines.current()->data().c_str() << endl;
lines.forward(1);
}
// Make sure to close the file.
outputHandle.close();
}
void textFile::setFile(string file)
{
fileName = file;

10. }
/*
Returns the name of the file being worked with.
*/
string textFile::getFile()
{
return fileName;
}
simpleList.cpp
#include
#include "node.hpp"
#include "simpleList.hpp"
using namespace std;
template simpleList::simpleList()
{
head = nullptr;
tail = nullptr;
currentPtr = nullptr;
listSize = 0;
}
template simpleList::~simpleList()
{
clear();
}
// Appends data to the end of the list.
template void simpleList::append(dataType newData)
{
node *newNode = new node;
newNode->container = newData;
if (newNode == nullptr) {
cerr << "Error allocating memory, append failed." << endl;
} else {
if (head == nullptr && tail == nullptr) {
head = newNode;

11. tail = newNode;
} else {
tail->nextPtr = newNode;
newNode->prevPtr = tail;
tail = newNode;
}
listSize++;
}
}
*/
template void simpleList::insert(dataType newData)
{
if (currentPtr == nullptr) {
currentPtr = head;
}
node *newNode = new node;
newNode->container = newData;
if (newNode == nullptr) {
cerr << "Error allocating memory, insert failed." << endl;
} else if (currentPtr == head) {
head = newNode;
currentPtr->prevPtr = newNode;
newNode->nextPtr = currentPtr;
currentPtr = newNode;
listSize++;
} else {
currentPtr->prevPtr->nextPtr = newNode;
newNode->nextPtr = currentPtr;
newNode->prevPtr = currentPtr->prevPtr;
currentPtr->prevPtr = newNode;
currentPtr = newNode;
listSize++;
}
}
template void simpleList::forward(unsigned long distance)

12. {
for(int x = 0; x < distance; x++) {
if (currentPtr->nextPtr != nullptr) {
currentPtr = currentPtr->nextPtr;
} else {
break;
}
}
}
template void simpleList::backwward(unsigned long distance)
{
for(int x = 0; x < distance; x++) {
if (currentPtr->prevPtr != nullptr) {
currentPtr = currentPtr->prevPtr;
} else {
break;
}
}
}
// Reset the current pointer back to the beginning of the list.
template void simpleList::toHead()
{
currentPtr = head;
}
// Reset the current pointer to the end of the list.
template void simpleList::toTail()
{
currentPtr = tail;
}
template node *simpleList::find(dataType searchData)
{
node *searchPtr = head;
while (searchPtr->nextPtr != nullptr) {
if (searchData == searchPtr->container) {
currentPtr = searchPtr;

13. return currentPtr;
}
}
return nullptr;
}
template void simpleList::remove()
{
if (currentPtr == nullptr) {
currentPtr = tail;
}
node *toRemove = currentPtr;
if (currentPtr == tail && currentPtr == head) {
tail = nullptr;
head = nullptr;
currentPtr = nullptr;
} else if (currentPtr == tail) {
tail = currentPtr->prevPtr;
tail->nextPtr = nullptr;
currentPtr = tail;
} else if (currentPtr == head) {
head = currentPtr->nextPtr;
head->prevPtr = nullptr;
currentPtr = head;
} else {
currentPtr->prevPtr->nextPtr = currentPtr->nextPtr;
currentPtr->nextPtr->prevPtr = currentPtr->prevPtr;
currentPtr = currentPtr->prevPtr;
}
delete toRemove;
listSize--;
}
// Removes all items from memory.

14. template void simpleList::clear()
{
if (listSize > 0 && head != nullptr && tail != nullptr) {
currentPtr = head;
while (listSize > 0) {
remove();
}
}
}
// Give the current size of the list.
template unsigned long simpleList::size()
{
return listSize;
}
// Return the current pointer.
template node *simpleList::current()
{
return currentPtr;
}
simpleList.hpp
#ifndef simpleList_hpp
#define simpleList_hpp
#include "node.hpp"
namespace std {
using namespace std;
template
class simpleList {
private:
node *head;
node *tail;
node *currentPtr;
unsigned long listSize;
public:

15. simpleList();
~simpleList();
void append(dataType newData);
void insert(dataType newData);
void forward(unsigned long distance);
void backwward(unsigned long distance);
void toHead();
void toTail();
node *find(dataType searchData);
void remove();
void clear();
unsigned long size();
node *current();
};
}
#endif /* simpleList_hpp */
node.cpp
#include "node.hpp"
using namespace std;
template node::node()
{
prevPtr = nullptr;
nextPtr = nullptr;
}
template node::node(node *prv, node *nxt)
{
prevPtr = prv;
nextPtr = nxt;
}
template node *node::prev()
{
return prevPtr;
}
template node *node::next()

16. {
return nextPtr;
}
/*
Returns the data contents of the node.
*/
template dataType node::data()
{
return container;
}
/*
Stores new data in the node, replacing the old data.
*/
template void node::data(dataType newData)
{
container = newData;
}
node.hpp
#ifndef node_hpp
#define node_hpp
namespace std {
template
class node {
template friend class simpleList;
private:
node *prevPtr;
node *nextPtr;
dataType container;
public:
node(); // Create a new, blank, node.
node(node *prv, node *nxt); // Create a new node with pointers.
~node(); // Destroy the node.
node *next(); // Returns the next object pointer
node *prev(); // Returns the previous object pointer
dataType data(); // Returns the nodes data.

17. void data(dataType); // Stores data in the node.
};
}
#endif /* node_hpp */
data.txt
The first line
The second line
And another line
One more line
what do you try to type here?
I like sugar cookies
This line is boring......
This is the last line
Solution
#include
#include
#include
#include
#include "textFile.hpp"
using namespace std;
void displayHelp();
bool isInteger(const string &s);
bool askSave();
int main(int argc, const char * argv[]) {
int resultCode = 0;
// Convert to a vector.
vector args(argv, argv + argc);
// Process arguments, must be 1 argument, otherwise exit with code 1.
if (args.size() < 2) {
cout << "Missing command line argument!" << endl;
cout << "Usage: ./myEditor " << endl;

18. resultCode = 1;
} else {
string fileName = args[1];
textFile dataFile(fileName);
// Check if the file is ok to use, if it is, lets go.
if (!dataFile.checkFile()) {
resultCode = 2;
} else {
// We can now assume the file is good, so we can work with it.
dataFile.loadFile();
// Display some text to help the user.
displayHelp();
// Now get user input.
bool done = false;
string userInput = "";
while (!done) {
cout << "> ";
getline(cin, userInput);
char cmd = tolower(userInput.c_str()[0]);
char cmd2 = ' ';
if (userInput.size() > 1) {
cmd2 = userInput.c_str()[1];
}
// This check makes sure the command format is correct
// so that commands don't fire off by mistake.
if (strncmp(&cmd, " ", 1) != 0 && strncmp(&cmd2, " ", 1) == 0) {
switch(cmd) {
case 'q': {
done = true;
break;

19. }
case 'i': {
unsigned long lineIndex = dataFile.textLines() + 1;
string newLine;
if (userInput.size() > 1) {
string cmdArg = userInput.substr(2);
lineIndex = stol(cmdArg);
}
cout << to_string(lineIndex) << "> ";
getline(cin, newLine);
dataFile.insertLine(lineIndex - 1, newLine);
break;
}
case 'd': {
if (userInput.size() > 1) {
unsigned long lineIndex;
string cmdArg = userInput.substr(2);
lineIndex = stol(cmdArg);
dataFile.removeLine(lineIndex - 1);
}
break;
}
case 'l': {
for (int x = 0; x < dataFile.textLines(); x++) {
cout << to_string(x + 1) << "> " << dataFile.getLine(x) << endl;
}
break;
}
case 'h': {
displayHelp();
break;
}
case 's': {
dataFile.saveFile();
break;
}

20. }
}
}
// Ask about saving the file before exiting.
bool save = askSave();
if (save) {
dataFile.saveFile();
}
cout << "Thank you for using myEditor." << endl;
}
}
return resultCode;
}
/*
Asks the user if they'd like to save or not, returns true if they do. Anything
other than "y" or "Y" will be interpreted as a negative answer.
*/
bool askSave()
{
bool result = false;
string userInput = "";
cout << "Do you wan to save the change? (Y - yes; N - no) ";
getline(cin, userInput);
userInput = tolower(*userInput.c_str());
if (strncmp(userInput.c_str(), "y", 1) == 0) {
result = true;
}
return result;
}
/*
Displays help text.
*/
void displayHelp()
{

21. cout << "Welcome to my text editor." << endl;
cout << "tTo insert text at the end of the file, type 'I'" << endl;
cout << "followed by the text." << endl;
cout << "tTo insert text at a certain line number, type 'I'" << endl;
cout << "followed by a space and the desired line number." << endl;
cout << "tTo delete a line, type 'D' followed by a space and the" << endl;
cout << "line number." << endl;
cout << "tTo print all the lines, type 'L' and press enter." << endl;
cout << "tTo save the current content, type 'S' and press enter." << endl;
cout << "tTo display this introduction, type 'H' and press" << endl;
cout << "enter." << endl;
cout << "tTo quit, type 'Q' and press enter." << endl;
}
/*
Checks to see if a stirng is an integer, returns true if the string is an
integer, returns false it it is not.
*/
bool isInteger(const string &s)
{
char *p;
strtol(s.c_str(), &p, 10);
return (*p == 0);
}
textFile.hpp
#ifndef textFile_hpp
#define textFile_hpp
#include
#include
#include "simpleList.hpp"
using namespace std;
class textFile {
private:
simpleList lines; // Stores all lines of the file.
string fileName; // The name of the file being accessed.
ifstream inputHandle; // File object for reading data from the file.
ofstream outputHandle; // File object for writing data to the file.

22. public:
textFile(); // Default Constructor
textFile(string file); // Constructor
~textFile(); // Destructor
unsigned long textLines(); // Size of the text file in # of lines.
string getLine(unsigned long lineNumber); // One line of text from the file.
void setLine(unsigned long lineNumber, string data); // Sets a specific line to a new value.
void insertLine(unsigned long lineNumber, string data); // Inserts a line into the file.
void removeLine(unsigned long lineNumber); // Removes a line from the file.
bool checkFile(); // Checks to see if a file is good.
void loadFile(); // Loads all the data into the object of the text file in question.
void saveFile(); // Saves all the data in the object back to its file.
void setFile(string file); // Allows setting of the file name after object creation.
string getFile(); // Returns the name of the file being worked with.
};
#endif /* textFile_hpp */
textFile.cpp
#include
#include "textFile.hpp"
#include "simpleList.hpp"
using namespace std;
/*
Default constructor for textFile class.
*/
textFile::textFile()
{
fileName = "";
}
/*
Constructor that accepts the file name in the object creation.
*/
textFile::textFile(string file)
{
fileName = file;
}

23. /*
Destructor function, no action required at this tiem.
*/
textFile::~textFile()
{
// Nothing for here.
}
unsigned long textFile::textLines()
{
return lines.size();
}
string textFile::getLine(unsigned long lineNumber)
{
// Check to make sure we're not going to go out of bounds.
if (lineNumber < lines.size()) {
lines.toHead();
lines.forward(lineNumber);
return lines.current()->data();
} else {
// If the index of lines to return is out of bounds, return an empty
// string.
string noData = "";
return noData;
}
}
void textFile::setLine(unsigned long lineNumber, string data)
{
if (lines.size() > lineNumber) {
lines.toHead();
lines.forward(lineNumber);
lines.current()->data(data);
} else {
lines.toTail();
lines.current()->data(data);
}
}

24. /*
Inserts a new line into the lines vector with data.
*/
void textFile::insertLine(unsigned long lineNumber, string data)
{
if (lines.size() > lineNumber) {
lines.toHead();
lines.forward(lineNumber);
lines.insert(data);
} else {
// This will add enough lines to get to lineNumber x even if there are
// not enough lines.
unsigned long blanks = lineNumber - lines.size();
if (blanks > 0) {
string blankString = "";
for (unsigned int x; x < blanks; x++) {
lines.append(blankString);
}
}
lines.append(data);
}
}
/*
Removes a line from the lines vector.
*/
void textFile::removeLine(unsigned long lineNumber)
{
lines.toHead();
lines.forward(lineNumber);
lines.remove();
}
/*
Checks to see if the file is good to read/write from.
*/
bool textFile::checkFile()
{

25. // Open the file as if we want to read it.
inputHandle.open(fileName);
// Check to see if the file access is good.
bool result = inputHandle.good();
// Close the file.
inputHandle.close();
return result;
}
void textFile::loadFile()
{
// Make sure we start with a blank slate, no items in the vector.
if (lines.size() > 0)
{
lines.clear();
}
// Open up the file for reading.
string line;
inputHandle.open(fileName.c_str());
// Read every line until end of file.
while (!inputHandle.eof()) {
getline(inputHandle, line);
lines.append(line);
}
if (line == "") {
lines.toTail();
lines.remove();
}
// Make sure to close the file again.
inputHandle.close();
}
/*
Saves all lines in the lines vector to the file.
*/
void textFile::saveFile()
{

26. // Open the file for writing, this should erase an exiting file.
outputHandle.open(fileName.c_str());
// Write every line from the lines vector into the file, appending
// a new line to the end of each.
lines.toHead();
while (lines.current()->next() == nullptr) {
outputHandle << lines.current()->data().c_str() << endl;
lines.forward(1);
}
// Make sure to close the file.
outputHandle.close();
}
void textFile::setFile(string file)
{
fileName = file;
}
/*
Returns the name of the file being worked with.
*/
string textFile::getFile()
{
return fileName;
}
simpleList.cpp
#include
#include "node.hpp"
#include "simpleList.hpp"
using namespace std;
template simpleList::simpleList()
{
head = nullptr;
tail = nullptr;
currentPtr = nullptr;
listSize = 0;

27. }
template simpleList::~simpleList()
{
clear();
}
// Appends data to the end of the list.
template void simpleList::append(dataType newData)
{
node *newNode = new node;
newNode->container = newData;
if (newNode == nullptr) {
cerr << "Error allocating memory, append failed." << endl;
} else {
if (head == nullptr && tail == nullptr) {
head = newNode;
tail = newNode;
} else {
tail->nextPtr = newNode;
newNode->prevPtr = tail;
tail = newNode;
}
listSize++;
}
}
*/
template void simpleList::insert(dataType newData)
{
if (currentPtr == nullptr) {
currentPtr = head;
}
node *newNode = new node;
newNode->container = newData;
if (newNode == nullptr) {
cerr << "Error allocating memory, insert failed." << endl;
} else if (currentPtr == head) {

28. head = newNode;
currentPtr->prevPtr = newNode;
newNode->nextPtr = currentPtr;
currentPtr = newNode;
listSize++;
} else {
currentPtr->prevPtr->nextPtr = newNode;
newNode->nextPtr = currentPtr;
newNode->prevPtr = currentPtr->prevPtr;
currentPtr->prevPtr = newNode;
currentPtr = newNode;
listSize++;
}
}
template void simpleList::forward(unsigned long distance)
{
for(int x = 0; x < distance; x++) {
if (currentPtr->nextPtr != nullptr) {
currentPtr = currentPtr->nextPtr;
} else {
break;
}
}
}
template void simpleList::backwward(unsigned long distance)
{
for(int x = 0; x < distance; x++) {
if (currentPtr->prevPtr != nullptr) {
currentPtr = currentPtr->prevPtr;
} else {
break;
}
}
}
// Reset the current pointer back to the beginning of the list.
template void simpleList::toHead()

29. {
currentPtr = head;
}
// Reset the current pointer to the end of the list.
template void simpleList::toTail()
{
currentPtr = tail;
}
template node *simpleList::find(dataType searchData)
{
node *searchPtr = head;
while (searchPtr->nextPtr != nullptr) {
if (searchData == searchPtr->container) {
currentPtr = searchPtr;
return currentPtr;
}
}
return nullptr;
}
template void simpleList::remove()
{
if (currentPtr == nullptr) {
currentPtr = tail;
}
node *toRemove = currentPtr;
if (currentPtr == tail && currentPtr == head) {
tail = nullptr;
head = nullptr;
currentPtr = nullptr;
} else if (currentPtr == tail) {
tail = currentPtr->prevPtr;
tail->nextPtr = nullptr;

30. currentPtr = tail;
} else if (currentPtr == head) {
head = currentPtr->nextPtr;
head->prevPtr = nullptr;
currentPtr = head;
} else {
currentPtr->prevPtr->nextPtr = currentPtr->nextPtr;
currentPtr->nextPtr->prevPtr = currentPtr->prevPtr;
currentPtr = currentPtr->prevPtr;
}
delete toRemove;
listSize--;
}
// Removes all items from memory.
template void simpleList::clear()
{
if (listSize > 0 && head != nullptr && tail != nullptr) {
currentPtr = head;
while (listSize > 0) {
remove();
}
}
}
// Give the current size of the list.
template unsigned long simpleList::size()
{
return listSize;
}
// Return the current pointer.
template node *simpleList::current()
{
return currentPtr;
}

31. simpleList.hpp
#ifndef simpleList_hpp
#define simpleList_hpp
#include "node.hpp"
namespace std {
using namespace std;
template
class simpleList {
private:
node *head;
node *tail;
node *currentPtr;
unsigned long listSize;
public:
simpleList();
~simpleList();
void append(dataType newData);
void insert(dataType newData);
void forward(unsigned long distance);
void backwward(unsigned long distance);
void toHead();
void toTail();
node *find(dataType searchData);
void remove();
void clear();
unsigned long size();
node *current();
};
}
#endif /* simpleList_hpp */
node.cpp
#include "node.hpp"
using namespace std;

32. template node::node()
{
prevPtr = nullptr;
nextPtr = nullptr;
}
template node::node(node *prv, node *nxt)
{
prevPtr = prv;
nextPtr = nxt;
}
template node *node::prev()
{
return prevPtr;
}
template node *node::next()
{
return nextPtr;
}
/*
Returns the data contents of the node.
*/
template dataType node::data()
{
return container;
}
/*
Stores new data in the node, replacing the old data.
*/
template void node::data(dataType newData)
{
container = newData;
}
node.hpp
#ifndef node_hpp
#define node_hpp

33. namespace std {
template
class node {
template friend class simpleList;
private:
node *prevPtr;
node *nextPtr;
dataType container;
public:
node(); // Create a new, blank, node.
node(node *prv, node *nxt); // Create a new node with pointers.
~node(); // Destroy the node.
node *next(); // Returns the next object pointer
node *prev(); // Returns the previous object pointer
dataType data(); // Returns the nodes data.
void data(dataType); // Stores data in the node.
};
}
#endif /* node_hpp */
data.txt
The first line
The second line
And another line
One more line
what do you try to type here?
I like sugar cookies
This line is boring......
This is the last line