1 files changed, 82 insertions, 0 deletions
diff --git a/Rx/NET/Source/System.Reactive.Core/Reactive/Unit.cs b/Rx/NET/Source/System.Reactive.Core/Reactive/Unit.cs
new file mode 100644
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+++ b/Rx/NET/Source/System.Reactive.Core/Reactive/Unit.cs
@@ -0,0 +1,82 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+namespace System.Reactive
+{
+    /// <summary>
+    /// Represents a type with a single value. This type is often used to denote the successful completion of a void-returning method (C#) or a Sub procedure (Visual Basic).
+    /// </summary>
+#if !NO_SERIALIZABLE
+    [Serializable]
+#endif
+    public struct Unit : IEquatable<Unit>
+    {
+        /// <summary>
+        /// Determines whether the specified Unit values is equal to the current Unit. Because Unit has a single value, this always returns true.
+        /// </summary>
+        /// <param name="other">An object to compare to the current Unit value.</param>
+        /// <returns>Because Unit has a single value, this always returns true.</returns>
+        public bool Equals(Unit other)
+        {
+            return true;
+        }
+
+        /// <summary>
+        /// Determines whether the specified System.Object is equal to the current Unit.
+        /// </summary>
+        /// <param name="obj">The System.Object to compare with the current Unit.</param>
+        /// <returns>true if the specified System.Object is a Unit value; otherwise, false.</returns>
+        public override bool Equals(object obj)
+        {
+            return obj is Unit;
+        }
+
+        /// <summary>
+        /// Returns the hash code for the current Unit value.
+        /// </summary>
+        /// <returns>A hash code for the current Unit value.</returns>
+        public override int GetHashCode()
+        {
+            return 0;
+        }
+
+        /// <summary>
+        /// Returns a string representation of the current Unit value.
+        /// </summary>
+        /// <returns>String representation of the current Unit value.</returns>
+        public override string ToString()
+        {
+            return "()";
+        }
+
+        /// <summary>
+        /// Determines whether the two specified Unit values are equal. Because Unit has a single value, this always returns true.
+        /// </summary>
+        /// <param name="first">The first Unit value to compare.</param>
+        /// <param name="second">The second Unit value to compare.</param>
+        /// <returns>Because Unit has a single value, this always returns true.</returns>
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA1801:ReviewUnusedParameters", MessageId = "first", Justification = "Parameter required for operator overloading."), System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA1801:ReviewUnusedParameters", MessageId = "second", Justification = "Parameter required for operator overloading.")]
+        public static bool operator ==(Unit first, Unit second)
+        {
+            return true;
+        }
+
+        /// <summary>
+        /// Determines whether the two specified Unit values are not equal. Because Unit has a single value, this always returns false.
+        /// </summary>
+        /// <param name="first">The first Unit value to compare.</param>
+        /// <param name="second">The second Unit value to compare.</param>
+        /// <returns>Because Unit has a single value, this always returns false.</returns>
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA1801:ReviewUnusedParameters", MessageId = "first", Justification = "Parameter required for operator overloading."), System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA1801:ReviewUnusedParameters", MessageId = "second", Justification = "Parameter required for operator overloading.")]
+        public static bool operator !=(Unit first, Unit second)
+        {
+            return false;
+        }
+
+        static readonly Unit _default = new Unit();
+
+        /// <summary>
+        /// Gets the single unit value.
+        /// </summary>
+        public static Unit Default { get { return _default; } }
+    }
+}