// // Copyright (c) 2008 Novell, Inc. (http://www.novell.com) // // Permission is hereby granted, free of charge, to any person obtaining // a copy of this software and associated documentation files (the // "Software"), to deal in the Software without restriction, including // without limitation the rights to use, copy, modify, merge, publish, // distribute, sublicense, and/or sell copies of the Software, and to // permit persons to whom the Software is furnished to do so, subject to // the following conditions: // // The above copyright notice and this permission notice shall be // included in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. // namespace Fizzler { #region Imports using System; using System.Collections.Generic; #endregion // Adapted from Mono Rocks internal abstract class Either : IEquatable> { private Either() {} public static Either A(TA value) { if (value == null) throw new ArgumentNullException("value"); return new AImpl(value); } public static Either B(TB value) { if (value == null) throw new ArgumentNullException("value"); return new BImpl(value); } public override abstract bool Equals(object obj); public abstract bool Equals(Either obj); public override abstract int GetHashCode(); public override abstract string ToString(); public abstract TResult Fold(Func a, Func b); private sealed class AImpl : Either { private readonly TA _value; public AImpl(TA value) { _value = value; } public override int GetHashCode() { return _value.GetHashCode(); } public override bool Equals(object obj) { return Equals(obj as AImpl); } public override bool Equals(Either obj) { var a = obj as AImpl; return a != null && EqualityComparer.Default.Equals(_value, a._value); } public override TResult Fold(Func a, Func b) { if (a == null) throw new ArgumentNullException("a"); if (b == null) throw new ArgumentNullException("b"); return a(_value); } public override string ToString() { return _value.ToString(); } } private sealed class BImpl : Either { private readonly TB _value; public BImpl(TB value) { _value = value; } public override int GetHashCode() { return _value.GetHashCode(); } public override bool Equals(object obj) { return Equals(obj as BImpl); } public override bool Equals(Either obj) { var b = obj as BImpl; return b != null && EqualityComparer.Default.Equals(_value, b._value); } public override TResult Fold(Func a, Func b) { if (a == null) throw new ArgumentNullException("a"); if (b == null) throw new ArgumentNullException("b"); return b(_value); } public override string ToString() { return _value.ToString(); } } } }