daily update on 20230525 by nitload youmu, ses00001 not solved

源代码/StgSharp/Logic/LinkedList.cs

@@ -1,4 +1,5 @@
-using StgSharp.Logic;
+using StgSharp.Graphics;
+using StgSharp.Logic;
 using System;
 using System.Collections;
 using System.Collections.Generic;
@@ -9,43 +10,60 @@ namespace StgSharp
     public class LinkedList<T>:INode<LinkedList<T>>,IEnumerable where T: INode<T>
     {
         internal readonly ContainerNode<T> _heading;
-        internal ContainerNode<T> _first;
-        internal ContainerNode<T> _tail;
         private ContainerNode<T> _cache;
+        private bool isEmpty;
 
         public LinkedList()
         {
-            _heading = new ContainerNode<T>(default(T));
+            _heading = new ContainerNode<T>(null);
+            isEmpty = true;
+
+#if DEBUG
+            Console.WriteLine("Linked list init ok");
+#endif
         }
 
         public T First
         {
-            get { return _first._value; }
-            set 
-            {
-                _first = new ContainerNode<T>(value);
-                _heading._next = _first;
-            }
+            get { return _heading._next._value; }
+            private set { _heading._next = value.ID; }
         }
 
         public T Tail
         {
-            get { return _tail._value; }
-            set { _tail = new ContainerNode<T>(value); }
+            get { return _heading._previous._value; }
+            private set { _heading._previous = value.ID; }
         }
 
+        /// <summary>
+        /// Add an item to the tail of linked list.
+        /// </summary>
+        /// <param name="t">The item ready to add to the list</param>
         public void Add(T t)
         {
-            if (_first != default(ContainerNode<T>))
+            //checkout if the linkedlist is null
+            if (isEmpty)
             {
-                First = t;
+                _heading._next = t.ID;
+                _heading._previous = t.ID;
+                t.Next = _heading;
+                t.Previous = _heading;
+                isEmpty = false;
+                Console.WriteLine("1st item ok");
+                Console.WriteLine(_heading._next);
+                Console.WriteLine(_heading._previous);
             }
             else
             {
-                _cache = new ContainerNode<T>(t);
-                _tail._next = _cache;
-                _cache._previous = _tail;
-                _tail = _cache;
+                Console.WriteLine("next begin");
+                t.Next = _heading;
+                Console.WriteLine("step 01 ok");
+                t.Previous = _heading.Previous;
+                Console.WriteLine("step 02 ok");
+                _heading._previous._next = t.ID;
+                Console.WriteLine("step 03 ok");
+                _heading._previous = t.ID;
+                
             }
         }
 
@@ -63,15 +81,18 @@ namespace StgSharp
 
         public void RemoveTail()
         {
-            if (_tail==default(ContainerNode<T>))
+            //check out if the list has only one member
+            if (Tail == First)
             {
+                First = default;
 
+
+                isEmpty = true;
             }
             else
             {
-                _cache = _tail;
-                _tail = _cache._previous;
-                _cache._previous = default(ContainerNode<T>);
+                Tail.Previous.Next = _heading;
+                Tail.Next = null;
             }
         }