Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Shared / MS / Utility / ItemList.cs / 1305600 / ItemList.cs
using System; using MS.Internal.WindowsBase; namespace MS.Utility { // // ItemStructList// [FriendAccessAllowed] // Built into Base, also used by Framework. internal struct ItemStructList { public ItemStructList(int capacity) { List = new T[capacity]; Count = 0; } // // Non-lock-required Read methods // (Always safe to call when locking "safe" write operations are used) // public T[] List; public int Count; public void EnsureIndex(int index) { int delta = (index + 1) - Count; if (delta > 0) { Add(delta); } } public bool IsValidIndex(int index) { return (index >= 0 && index < Count); } public int IndexOf(T value) { int index = -1; for (int i = 0; i < Count; i++) { if (List[i].Equals(value)) { index = i; break; } } return index; } public bool Contains(T value) { return (IndexOf(value) != -1); } // // Lock-required Write operations // "Safe" methods for Reader lock-free operation // // Increase size by one, new value is provided public void Add(T item) { // Add without Count adjustment (incr Count after valid item added) int index = Add(1, false); List[index] = item; Count++; } // Increase size by one, new value is provided public void Add(ref T item) { // Add without Count adjustment (incr Count after valid item added) int index = Add(1, false); List[index] = item; Count++; } // Increase size by one, new value is default value public int Add() { return Add(1, true); } // Increase size of array by delta, fill with default values public int Add(int delta) { return Add(delta, true); } // Increase size of array by delta, fill with default values // Allow disable of automatic Count increment so that cases where // non-default values are to be added to the list can be done before // count is changed. This is important for non-locking scenarios // (i.e. count is adjusted after array size changes) private int Add(int delta, bool incrCount) { if (List != null) { if ((Count + delta) > List.Length) { T[] newList = new T[Math.Max(List.Length * 2, Count + delta)]; List.CopyTo(newList, 0); List = newList; } } else { List = new T[Math.Max(delta, 2)]; } // New arrays auto-initialized to default entry values // Any resued entried have already been cleared out by Remove or Clear int index = Count; // Optional adjustment of Count if (incrCount) { // Adjust count after resize so that array bounds and data // are never invalid (good for locking writes without synchronized reads) Count += delta; } return index; } public void Sort() { if (List != null) { Array.Sort(List, 0, Count); } } public void AppendTo(ref ItemStructList destinationList) { for (int i = 0; i < Count; i++) { destinationList.Add(ref List[i]); } } public T[] ToArray() { T[] array = new T[Count]; Array.Copy(List, 0, array, 0, Count); return array; } // // Lock-required Write operations // "UNSafe" methods for Reader lock-free operation // // If any of these methods are called, the entire class is considered // unsafe for Reader lock-free operation for that point on (meaning // Reader locks must be taken) // public void Clear() { // Return now unused entries back to default Array.Clear(List, 0, Count); Count = 0; } public void Remove(T value) { int index = IndexOf(value); if (index != -1) { // Shift entries down Array.Copy(List, index + 1, List, index, (Count - index - 1)); // Return now unused entries back to default Array.Clear(List, Count - 1, 1); Count--; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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