116 lines
3.4 KiB
C#
116 lines
3.4 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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using System.Collections.Generic;
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using System.Globalization;
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namespace System.Reactive
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{
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abstract class Either<TLeft, TRight>
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{
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Either()
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{
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}
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public static Either<TLeft, TRight> CreateLeft(TLeft value)
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{
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return new Either<TLeft, TRight>.Left(value);
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}
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public static Either<TLeft, TRight> CreateRight(TRight value)
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{
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return new Either<TLeft, TRight>.Right(value);
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}
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public abstract TResult Switch<TResult>(Func<TLeft, TResult> caseLeft, Func<TRight, TResult> caseRight);
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public abstract void Switch(Action<TLeft> caseLeft, Action<TRight> caseRight);
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public sealed class Left : Either<TLeft, TRight>, IEquatable<Left>
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{
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public TLeft Value { get; private set; }
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public Left(TLeft value)
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{
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Value = value;
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}
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public override TResult Switch<TResult>(Func<TLeft, TResult> caseLeft, Func<TRight, TResult> caseRight)
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{
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return caseLeft(Value);
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}
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public override void Switch(Action<TLeft> caseLeft, Action<TRight> caseRight)
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{
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caseLeft(Value);
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}
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public bool Equals(Left other)
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{
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if (other == this)
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return true;
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if (other == null)
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return false;
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return EqualityComparer<TLeft>.Default.Equals(Value, other.Value);
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}
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public override bool Equals(object obj)
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{
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return Equals(obj as Left);
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}
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public override int GetHashCode()
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{
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return EqualityComparer<TLeft>.Default.GetHashCode(Value);
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}
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public override string ToString()
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{
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return string.Format(CultureInfo.CurrentCulture, "Left({0})", Value);
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}
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}
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public sealed class Right : Either<TLeft, TRight>, IEquatable<Right>
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{
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public TRight Value { get; private set; }
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public Right(TRight value)
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{
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Value = value;
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}
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public override TResult Switch<TResult>(Func<TLeft, TResult> caseLeft, Func<TRight, TResult> caseRight)
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{
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return caseRight(Value);
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}
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public override void Switch(Action<TLeft> caseLeft, Action<TRight> caseRight)
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{
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caseRight(Value);
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}
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public bool Equals(Right other)
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{
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if (other == this)
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return true;
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if (other == null)
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return false;
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return EqualityComparer<TRight>.Default.Equals(Value, other.Value);
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}
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public override bool Equals(object obj)
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{
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return Equals(obj as Right);
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}
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public override int GetHashCode()
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{
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return EqualityComparer<TRight>.Default.GetHashCode(Value);
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}
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public override string ToString()
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{
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return string.Format(CultureInfo.CurrentCulture, "Right({0})", Value);
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}
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}
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}
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}
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