LabsStructure/deque/deque.cpp at main · RayStar-k/LabsStructure · GitHub

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#include "deque.h"

template<typename T>
Deque<T>::Deque()
{
	this->head = nullptr;
	this->back = nullptr;
	Size = 0;
}

template<typename T>
Deque<T>::~Deque()
{
	clear();
}

template<typename T>
T& Deque<T>::operator[](int index)
{
	return getAt(index);
}

template<typename T>
T& Deque<T>::getAt(int index)
{
	if (index < this->Size / 2)
	{
		int counter = 0;
		Node<T>* current = this->head;

		while (current != nullptr)
		{
			if (index == counter)
			{
				return current->Data;
			}
			current = current->pNext;
			counter++;
		}
	}

	else

	{
		int counter = this->Size - 1;
		Node<T>* current = this->back;
		while (current != nullptr)
		{
			if (index == counter)
			{
				return current->Data;
			}
			current = current->pPrev;
			counter--;
		}
	}
}

template<typename T>
T Deque<T>::front()
{
	return getAt(0);
}

template<typename T>
T Deque<T>::last()
{
	return getAt(Size-1);
}

template<typename T>
void Deque<T>::clear()
{
	while (head != nullptr)
	{
		popfront();
	}
}

template<typename T>
void Deque<T>::pushfront(T data)
{
	Node<T>* ptr = new Node<T>(data);
	ptr->pNext = head;
	if (this->head != nullptr)
	{
		 head->pPrev = ptr;
	}
	if (this -> back == nullptr)
	{
		this-> back = ptr;
	}

	this -> head = ptr;
	(this->Size)++;
}

template<typename T>
void Deque<T>::pushback(T data)
{
	Node<T>* ptr = new Node<T>(data);
	ptr->pPrev = back;
	if(this->back != nullptr)
	{
		back->pNext = ptr;
	}
	if (head == nullptr)
	{
		head = ptr;

	}
	back = ptr;
	(this->Size)++;
}

template<typename T>
void Deque<T>::popfront()
{
	if (this->Size == 0)
	{
		return;
	}

	Node<T>* ptr = head->pNext;
	if (ptr != nullptr)
	{
		ptr->pPrev = nullptr;

	}
	else
	{
		back = nullptr;
	}
	delete head;
	head = ptr;
	(this->Size)--;
}

template<typename T>
void Deque<T>::popback()
{
	if (this->Size == 0)
	{
		return;
	}
	Node<T>* ptr = back->pPrev;
	if (ptr != nullptr)
	{
		ptr->pNext = nullptr;
	}
	else
	{
		head = nullptr;
	}
	delete back;
	back = ptr;
	(this->Size)--;
}

template<typename T>
int Deque<T>::getSize()
{
	return this ->Size;
}

template<typename T>
bool Deque<T>::isEmpty()
{
	if (this->Size == 0)
	{
		return true;
	}
	else
	{
		return false;
	}
}