template <class T>
void CSortList<T>::swap(Node<T>* previousA, Node<T>* a, Node<T>* previousB, Node<T>* b) {
	if (a == b)
		return;

	if (a->link == b || b->link == a)
	{
		this->xchangeInfo(a, b);
		return;
	}

	if (previousA == nullptr)
	{
		head = b;

	}
	else
	{
		previousA->link = b;
	}

	if (previousB == nullptr)
	{
		head = a;

	}
	else
	{
		previousB->link = a;

	}

	Node<T>* tmp = a->link;
	a->link = b->link;
	b->link = tmp;

	while (tail->link != nullptr)
	{
		tail = tail->link;
	}
}