Implement the following functions inside the LinkedBag:

-add a value at the end of the list

-eliminate a value from the list without losing the original order

-print the contents of the array

-in the main program, show how the copy constructor works

//////////////////////////LinkedBag.cpp////////////////////////////////////

#include "LinkedBag.h"

#include "Node.h"

#include

template

LinkedBag::LinkedBag() : headPtr(nullptr), itemCount(0)

{

} // end default constructor

template

LinkedBag::LinkedBag(const LinkedBag& aBag)

{

itemCount = aBag.itemCount;

Node* origChainPtr = aBag.headPtr; // Points to nodes in original chain

if (origChainPtr == nullptr)

headPtr = nullptr; // Original bag is empty

else

{

// Copy first node

headPtr = new Node();

headPtr->setItem(origChainPtr->getItem());

// Copy remaining nodes

Node* newChainPtr = headPtr; // Points to last node in new chain

origChainPtr = origChainPtr->getNext(); // Advance original-chain pointer

while (origChainPtr != nullptr)

{

// Get next item from original chain

ItemType nextItem = origChainPtr->getItem();

// Create a new node containing the next item

Node* newNodePtr = new Node(nextItem);

// Link new node to end of new chain

newChainPtr->setNext(newNodePtr);

// Advance pointer to new last node

newChainPtr = newChainPtr->getNext();

// Advance original-chain pointer

origChainPtr = origChainPtr->getNext();

} // end while

newChainPtr->setNext(nullptr); // Flag end of chain

} // end if

} // end copy constructor

template

LinkedBag::~LinkedBag()

{

clear();

} // end destructor

template

bool LinkedBag::isEmpty() const

{

return itemCount == 0;

} // end isEmpty

template

int LinkedBag::getCurrentSize() const

{

return itemCount;

} // end getCurrentSize

template

bool LinkedBag::add(const ItemType& newEntry)

{

// Add to beginning of chain: new node references rest of chain;

// (headPtr is null if chain is empty)

Node* nextNodePtr = new Node();

nextNodePtr->setItem(newEntry);

nextNodePtr->setNext(headPtr); // New node points to chain

// Node* nextNodePtr = new Node(newEntry, headPtr); // alternate code

headPtr = nextNodePtr; // New node is now first node

itemCount++;

return true;

} // end add

template

vector LinkedBag::toVector() const

{

vector bagContents;

Node* curPtr = headPtr;

int counter = 0;

while ((curPtr != nullptr) && (counter < itemCount))

{

bagContents.push_back(curPtr->getItem());

curPtr = curPtr->getNext();

counter++;

} // end while

return bagContents;

} // end toVector

template

bool LinkedBag::remove(const ItemType& anEntry)

{

Node* entryNodePtr = getPointerTo(anEntry);

bool canRemoveItem = !isEmpty() && (entryNodePtr != nullptr);

if (canRemoveItem)

{

// Copy data from first node to located node

entryNodePtr->setItem(headPtr->getItem());

// Delete first node

Node* nodeToDeletePtr = headPtr;

headPtr = headPtr->getNext();

// Return node to the system

nodeToDeletePtr->setNext(nullptr);

delete nodeToDeletePtr;

nodeToDeletePtr = nullptr;

itemCount--;

} // end if

return canRemoveItem;

} // end remove

template

void LinkedBag::clear()

{

Node* nodeToDeletePtr = headPtr;

while (headPtr != nullptr)

{

headPtr = headPtr->getNext();

// Return node to the system

nodeToDeletePtr->setNext(nullptr);

delete nodeToDeletePtr;

nodeToDeletePtr = headPtr;

} // end while

// headPtr is nullptr; nodeToDeletePtr is nullptr

itemCount = 0;

} // end clear

template

int LinkedBag::getFrequencyOf(const ItemType& anEntry) const

{

int frequency = 0;

int counter = 0;

Node* curPtr = headPtr;

while ((curPtr != nullptr) && (counter < itemCount))

{

if (anEntry == curPtr->getItem())

{

frequency++;

} // end if

counter++;

curPtr = curPtr->getNext();

} // end while

return frequency;

} // end getFrequencyOf

template

bool LinkedBag::contains(const ItemType& anEntry) const

{

return (getPointerTo(anEntry) != nullptr);

} // end contains

// private

// Returns either a pointer to the node containing a given entry

// or the null pointer if the entry is not in the bag.

template

Node* LinkedBag::getPointerTo(const ItemType& anEntry) const

{

bool found = false;

Node* curPtr = headPtr;

while (!found && (curPtr != nullptr))

{

if (anEntry == curPtr->getItem())

found = true;

else

curPtr = curPtr->getNext();

} // end while

return curPtr;

} // end getPointerTo

//////////////////////LinkedBag.h///////////////////////////////////////

#ifndef _LINKED_BAG #define _LINKED_BAG

#include "BagInterface.h" #include "Node.h"

template class LinkedBag : public BagInterface { private: Node* headPtr; // Pointer to first node int itemCount; // Current count of bag items // Returns either a pointer to the node containing a given entry // or the null pointer if the entry is not in the bag. Node* getPointerTo(const ItemType& target) const; public: LinkedBag(); LinkedBag(const LinkedBag& aBag); // Copy constructor virtual ~LinkedBag(); // Destructor should be virtual int getCurrentSize() const; bool isEmpty() const; bool add(const ItemType& newEntry); bool remove(const ItemType& anEntry); void clear(); bool contains(const ItemType& anEntry) const; int getFrequencyOf(const ItemType& anEntry) const; vector toVector() const; }; // end LinkedBag

#include "LinkedBag.cpp" #endif

////////////////////////////////////////Node.h///////////////////////////////////////

#ifndef _NODE #define _NODE

template class Node { private: ItemType item; // A data item Node* next; // Pointer to next node public: Node(); Node(const ItemType& anItem); Node(const ItemType& anItem, Node* nextNodePtr); void setItem(const ItemType& anItem); void setNext(Node* nextNodePtr); ItemType getItem() const ; Node* getNext() const ; }; // end Node

#include "Node.cpp" #endif

//////////////////////////Node.cpp////////////////////////////////////////

#include "Node.h" #include

template Node::Node() : next(nullptr) { } // end default constructor

template Node::Node(const ItemType& anItem) : item(anItem), next(nullptr) { } // end constructor

template Node::Node(const ItemType& anItem, Node* nextNodePtr) : item(anItem), next(nextNodePtr) { } // end constructor

template void Node::setItem(const ItemType& anItem) { item = anItem; } // end setItem

template void Node::setNext(Node* nextNodePtr) { next = nextNodePtr; } // end setNext

template ItemType Node::getItem() const { return item; } // end getItem

template Node* Node::getNext() const { return next; } // end getNext

/////////////////////////////////////BagInterface.h/////////////////////////////////////

#ifndef _BAG_INTERFACE #define _BAG_INTERFACE

#include using namespace std;

template class BagInterface { public: /** Gets the current number of entries in this bag. @return The integer number of entries currently in the bag. */ virtual int getCurrentSize() const = 0; /** Sees whether this bag is empty. @return True if the bag is empty, or false if not. */ virtual bool isEmpty() const = 0; /** Adds a new entry to this bag. @post If successful, newEntry is stored in the bag and the count of items in the bag has increased by 1. @param newEntry The object to be added as a new entry. @return True if addition was successful, or false if not. */ virtual bool add(const ItemType& newEntry) = 0; /** Removes one occurrence of a given entry from this bag, if possible. @post If successful, anEntry has been removed from the bag and the count of items in the bag has decreased by 1. @param anEntry The entry to be removed. @return True if removal was successful, or false if not. */ virtual bool remove(const ItemType& anEntry) = 0; /** Removes all entries from this bag. @post Bag contains no items, and the count of items is 0. */ virtual void clear() = 0; /** Counts the number of times a given entry appears in bag. @param anEntry The entry to be counted. @return The number of times anEntry appears in the bag. */ virtual int getFrequencyOf(const ItemType& anEntry) const = 0; /** Tests whether this bag contains a given entry. @param anEntry The entry to locate. @return True if bag contains anEntry, or false otherwise. */ virtual bool contains(const ItemType& anEntry) const = 0; /** Empties and then fills a given vector with all entries that are in this bag. @return A vector containing all the entries in the bag. */ virtual vector toVector() const = 0; }; // end BagInterface #endif