public void AddFirst(int value)
{
_head = new NodeR(value) { Next = _head, Previous = _tail };
if (Size() == 1)
{
_tail = _head;
}
_head.Previous = _tail;
_tail.Next = _head;
}
public void AddFirst(int value)
{
_head = new NodeR(value)
{
Next = _head, Previous = _tail
};
if (Size() == 1)
{
_tail = _head;
}
_head.Previous = _tail;
_tail.Next = _head;
}
public int DelPosition(int position)
{
if (position <= 0 || position > Size() || Size() == 0)
{
throw new IndexOutOfRangeException();
}
var value = 0;
if (Size() == 1)
{
value = _head.Value;
}
else
{
NodeR previous = null;
var current = _head;
var index = 0;
while (current != _tail)
{
if (index == position)
{
if (previous != _tail)
{
previous.Next = current.Next;
if (current.Next == _tail)
{
_tail = previous;
}
}
else
{
_head = _head.Next;
if (_head == null)
{
_tail = null;
}
}
value = current.Value;
}
previous = current;
current = current.Next;
index++;
}
}
return(value);
}
public void AddLast(int value)
{
var node = new NodeR(value) { Next = _head };
if (Size() == 0)
{
_head = node;
_tail = _head;
_tail.Next = _head;
_head.Previous = _tail;
}
else
{
_tail.Next = node;
node.Previous = _tail;
node.Next = _head;
_head.Previous = node;
}
}
public int DelFirst()
{
if (Size() == 0)
{
throw new IndexOutOfRangeException();
}
var value = _head.Value;
_head = _head.Next;
if (Size() == 0)
{
_tail = null;
}
else
{
_head.Previous = _tail;
_tail.Next = _head;
}
return value;
}
public int DelLast()
{
if (Size() == 0)
{
throw new IndexOutOfRangeException();
}
var value = _tail.Value;
if (Size() == 1)
{
_head = null;
_tail = null;
}
else
{
_tail.Previous.Next = _head;
_tail = _tail.Previous;
_head.Previous = _tail;
}
return(value);
}
public void AddLast(int value)
{
var node = new NodeR(value)
{
Next = _head
};
if (Size() == 0)
{
_head = node;
_tail = _head;
_tail.Next = _head;
_head.Previous = _tail;
}
else
{
_tail.Next = node;
node.Previous = _tail;
node.Next = _head;
_head.Previous = node;
}
}
public int Size()
{
if (_tail != null)
{
_tail.Next = null;
}
var index = 0;
var current = _head;
while (current != null)
{
index++;
_tail = current;
current = current.Next;
}
if (_tail != null || _head != null)
{
_tail.Next = _head;
}
return(index);
}
public int DelPosition(int position)
{
if (position <= 0 || position > Size() || Size() == 0)
{
throw new IndexOutOfRangeException();
}
var value = 0;
if (Size() == 1)
{
value = _head.Value;
}
else
{
NodeR previous = null;
var current = _head;
var index = 0;
while (current != _tail)
{
if (index == position)
{
if (previous != _tail)
{
previous.Next = current.Next;
if (current.Next == _tail)
{
_tail = previous;
}
}
else
{
_head = _head.Next;
if (_head == null)
{
_tail = null;
}
}
value = current.Value;
}
previous = current;
current = current.Next;
index++;
}
}
return value;
}
public void Clear()
{
_head = null;
_tail = null;
}
public int Size()
{
if (_tail != null)
{
_tail.Next = null;
}
var index = 0;
var current = _head;
while (current != null)
{
index++;
_tail = current;
current = current.Next;
}
if (_tail != null || _head != null)
{
_tail.Next = _head;
}
return index;
}
public void Clear()
{
_head = null;
_tail = null;
}