//display list
public void Show()
{
Generalized <T> cur = head;
while (cur != tail.Next)
{
Console.WriteLine(cur.Data.ToString());
cur = cur.Next;
}
}
IEnumerator <T> IEnumerable <T> .GetEnumerator()
{
Generalized <T> cur = head;
while (cur != null)
{
yield return(cur.Data);
cur = cur.Next;
}
}
//add begin
public void AppendFirst(T data)
{
Generalized <T> gen = new Generalized <T>(data);
gen.Next = head;
head = gen;
if (count == 0)
{
tail = head;
}
count++;
}
//is element in list?
public bool Constrain(T data)
{
Generalized <T> cur = head;
while (cur != null)
{
if (cur.Data.Equals(data))
{
return(true);
}
cur = cur.Next;
}
return(false);
}
int count; //count elements in list
//add element
public void Add(T data)
{
Generalized <T> gen = new Generalized <T>(data);
if (head == null)
{
head = gen;
}
else
{
tail.Next = gen;
}
tail = gen;
count++;
}
//delete element
public bool Remove(T data)
{
Generalized <T> cur = head;
Generalized <T> prev = null;
while (cur != null)
{
if (cur.Data.Equals(data))
{
//if data inside or end of list
if (prev != null)
{
//remove cur, prev ref on car.Next
prev.Next = cur.Next;
//if cur.Next = null, than prev = tail
if (cur.Next == null)
{
tail = prev;
}
}
//if remove first el, update value 'head'
else
{
head = head.Next;
if (head == null)
{
tail = null;
}
}
count--;
return(true);
}
prev = cur;
cur = cur.Next;
}
return(false);
}
//clear list
public void Clear()
{
head = null;
tail = null;
count = 0;
}
