Merge pull request microsoft#881 from mpeyrotc/fix_copy

Remove destructive behavior from copy

Author: Vance Morrison

src/FastSerialization/SegmentedList.cs

@@ -36,7 +36,6 @@ public class SegmentedList<T> : ICollection<T>, IReadOnlyList<T>
         private int capacity;
         private int count;
         private T[][] items;
-        private int lastSegmentRead = 0;
 
         /// <summary>
         /// Constructs SegmentedList.
@@ -437,12 +436,6 @@ public void CopyRangeTo(T[] array, int arrayIndex, int startIndex, int endIndex)
                 remain -= len;
                 arrayIndex += (int)len;
                 segmentStartIndex = 0;
-
-                if (i != lastSegmentRead)
-                {
-                    this.items[lastSegmentRead] = null;
-                    lastSegmentRead = i;
-                }
             }
         }
 
@@ -475,7 +468,6 @@ public void Clear()
             items = null;
             count = 0;
             capacity = 0;
-            lastSegmentRead = 0;
         }
 
         /// <summary>
@@ -543,12 +535,6 @@ private void AddRoomForElement(int index)
             }
         }
 
-        public void ClearSegment()
-        {
-            this.items[lastSegmentRead] = null;
-            lastSegmentRead++;
-        }
-
         /// <summary>
         /// Shifts the tail of the list to remove the element.
         /// </summary>