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#ifndef H_circularLinkedList
#define H_circularLinkedList
#include <iostream>
#include <cassert>
using namespace std;
template <class Type>
struct nodeType
{
Type info;
nodeType<Type> *link;
};
template <class Type>
class circularLinkedList
{
public:
const circularLinkedList<Type>& operator=
(const circularLinkedList<Type>&);
//Overloads the assignment operator.
void initializeList();
//Initializes the list to an empty state.
//Postcondition: first = nullptr, last = nullptr,
// count = 0
bool isEmptyList();
//Function to determine whether the list is empty.
//Postcondition: Returns true if the list is empty;
// otherwise, returns false.
void print() const;
int length();
//Function to return the number of nodes in the
//list.
//Postcondition: The value of count is returned.
void destroyList();
//Function to delete all the nodes from the list.
//Postcondition: first = nullptr, last = nullptr,
// count = 0
Type front();
//Function to return the first element of the list.
//Precondition: The list must exist and must not be
//empty.
//Postcondition: If the list is empty, then the
// program terminates; otherwise,
// the first element of the list is
// returned.
Type back();
//Function to return the last element of the
//list.
//Precondition: The list must exist and must not
//be empty.
//Postcondition: If the list is empty, then the
// program terminates; otherwise,
// the last element of the list is
// returned.
bool search(const Type& searchItem);
//Function to determine whether searchItem is in
//the list.
//Postcondition: Returns true if searchItem is found
// in the list; otherwise, it returns
// false.
void insertNode(const Type& newitem);
void deleteNode(const Type& deleteItem);
//Function to delete deleteItem from the list.
//Postcondition: If found, the node containing
// deleteItem is deleted from the
// list, first points to the first
// node, and last points to the last
// node of the updated list.
circularLinkedList();
//Default constructor
//Initializes the list to an empty state.
//Postcondition: first = nullptr, last = nullptr,
// count = 0
circularLinkedList(const circularLinkedList<Type>& otherList);
//Copy constructor
~circularLinkedList();
//Destructor
//Deletes all the nodes from the list.
//Postcondition: The list object is destroyed.
protected:
int count; //variable to store the number of
//elements in the list
nodeType<Type> *first; //pointer to the first node of
//the list
nodeType<Type> *last; //pointer to the last node of
//the list
private:
void copyList(const circularLinkedList<Type>& otherList);
//Function to make a copy of otherList.
//Postcondition: A copy of otherList is created
// and assigned to this list.
};
template <class Type>
bool circularLinkedList<Type>::isEmptyList()
{
if(first == nullptr and last == nullptr and this->count == 0)
{
return true;
}
else return false;
}
template <class Type>
circularLinkedList<Type>::circularLinkedList() // default constructor
{
first = nullptr;
last = nullptr;
count = 0;
}
template <class Type>
void circularLinkedList<Type>::destroyList()
{
this->first = nullptr;
this->first->info = NULL;
}
template <class Type>
void circularLinkedList<Type>::initializeList()
{
destroyList(); //if the list has any nodes, delete them
}
template <class Type>
int circularLinkedList<Type>::length()
{
nodeType<Type> *current;
current->link = this->first;
current->info = this->first->info;
while(current->link != nullptr)
{
++count;
current->link = current->link->link;
current->info = current->link->info;
}
return count;
// function to find the length of the list
} // end length
template <class Type>
Type circularLinkedList<Type>::front()
{
assert(first != nullptr);
return first->link->info; //return the info of the first node
}//end front
template <class Type>
Type circularLinkedList<Type>::back()
{
assert(first != nullptr);
return first->info; //return the info of the first node
}//end back
template <class Type>
bool circularLinkedList<Type>::search(const Type& searchItem)
{
nodeType<Type> *current;
current->link = first->link;
current->info = first->info;
//overload = operator so info == info.
//current needs to point to the first node, then the next, then the next, until it reaches the end.
//current is redefined as current-> link, then evaluates current->link's info.
for(int i = 0; i < count; i++)
{
if(current->info == searchItem)
{
return true;
}
if(current->link != nullptr)
{
current->link = current->link->link;
current->info = current->link->info;
}
else return false;
}
// function to search the list for a given item
}//end search
template <class Type>
void circularLinkedList<Type>::insertNode(const Type& newitem)
{
// function to insert an item into the list
}//end insertNode
template <class Type>
void circularLinkedList<Type>::deleteNode(const Type& deleteItem)
{
// function to delete an item from the list
} //end deleteNode
//Overloading the stream insertion operator
template <class Type>
void circularLinkedList<Type>::print() const
{
for(int i = 0; i < this->count; i++)
{
nodeType<Type> *current;
current->link = this->first;
current->info = this->first->info;
cout << current->info;
if(current->link != nullptr)
{
current->link = current->link->link;
current->info = current->link->link->info;
}
}
}
template <class Type>
circularLinkedList<Type>::~circularLinkedList() // destructor
{
destroyList();
}//end destructor
template <class Type>
void circularLinkedList<Type>::copyList
(const circularLinkedList<Type>& otherList)
{
// function to copy the list
}//end copyList
//copy constructor
template<class Type>
circularLinkedList<Type>::circularLinkedList
(const circularLinkedList<Type>& otherList)
{
first = nullptr;
copyList(otherList);
}//end copy constructor
//overload the assignment operator
template <class Type>
const circularLinkedList<Type>& circularLinkedList<Type>::operator=
(const circularLinkedList<Type>& otherList)
{
if (this != &otherList) //avoid self-copy
{
copyList(otherList);
}//end else
return *this;
}
#endif
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