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AspClassic.VBScript/Compiler/Set.cs

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+/* ****************************************************************************
+ *
+ * Copyright (c) Microsoft Corporation. 
+ *
+ * This source code is subject to terms and conditions of the Microsoft Public License. A 
+ * copy of the license can be found in the License.html file at the root of this distribution. If 
+ * you cannot locate the  Microsoft Public License, please send an email to 
+ * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 
+ * by the terms of the Microsoft Public License.
+ *
+ * You must not remove this notice, or any other, from this software.
+ *
+ *
+ * ***************************************************************************/
+
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Dlrsoft.VBScript.Compiler {
+    /// <summary>
+    /// A simple hashset, built on Dictionary{K, V}
+    /// </summary>
+    internal sealed class Set<T> : ICollection<T> {
+        private readonly Dictionary<T, object> _data;
+
+        internal Set() {
+            _data = new Dictionary<T, object>();
+        }
+
+        internal Set(IEqualityComparer<T> comparer) {
+            _data = new Dictionary<T, object>(comparer);
+        }
+
+        internal Set(IList<T> list) {
+            _data = new Dictionary<T, object>(list.Count);
+            foreach (T t in list) {
+                Add(t);
+            }
+        }
+
+        internal Set(IEnumerable<T> list) {
+            _data = new Dictionary<T, object>();
+            foreach (T t in list) {
+                Add(t);
+            }
+        }
+
+        internal Set(int capacity) {
+            _data = new Dictionary<T, object>(capacity);
+        }
+
+        public void Add(T item) {
+            _data[item] = null;
+        }
+
+        public void Clear() {
+            _data.Clear();
+        }
+
+        public bool Contains(T item) {
+            return _data.ContainsKey(item);
+        }
+
+        public void CopyTo(T[] array, int arrayIndex) {
+            _data.Keys.CopyTo(array, arrayIndex);
+        }
+
+        public int Count {
+            get { return _data.Count; }
+        }
+
+        public bool IsReadOnly {
+            get { return false; }
+        }
+
+        public bool Remove(T item) {
+            return _data.Remove(item);
+        }
+
+        public IEnumerator<T> GetEnumerator() {
+            return _data.Keys.GetEnumerator();
+        }
+
+        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
+            return _data.Keys.GetEnumerator();
+        }
+    }
+}