encapsulate dict and list

Assets/IsoTools/Scripts/Internal/IsoAssocList.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+
+namespace IsoTools.Internal {
+	public class IsoAssocList<T> {
+		IsoList<T>           _list;
+		Dictionary<T, int>   _dict;
+		IEqualityComparer<T> _comparer;
+
+		public IsoAssocList() {
+			_list     = new IsoList<T>();
+			_dict     = new Dictionary<T, int>();
+			_comparer = EqualityComparer<T>.Default;
+		}
+
+		public IsoAssocList(int capacity) {
+			_list     = new IsoList<T>(capacity);
+			_dict     = new Dictionary<T, int>(capacity);
+			_comparer = EqualityComparer<T>.Default;
+		}
+
+		public IsoList<T> RawList {
+			get {
+				return _list;
+			}
+		}
+
+		public void Add(T item) {
+			if ( !_dict.ContainsKey(item) ) {
+				_dict.Add(item, _list.Count);
+				_list.Push(item);
+			}
+		}
+
+		public void Remove(T item) {
+			int index;
+			if ( _dict.TryGetValue(item, out index) ) {
+				_dict.Remove(item);
+				var reordered =_list.UnorderedRemoveAt(index);
+				if ( !_comparer.Equals(reordered, item) ) {
+					_dict[reordered] = index;
+				}
+			}
+		}
+
+		public void Clear() {
+			_list.Clear();
+			_dict.Clear();
+		}
+	}
+}

Assets/IsoTools/Scripts/Internal/IsoAssocList.cs.meta

@@ -0,0 +1,12 @@
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+timeCreated: 1454613003
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