gistfile1.txt

namespace Sample
{
	using System;
	using System.Collections.Generic;
	using System.Diagnostics;
	using System.Linq;
	using System.Threading;
	using CsharpMonads;

	public class ExpensiveOperation
	{
		private readonly Func<Maybe<int>> _operation1;
		private readonly Func<Maybe<int>> _operation2;

		public ExpensiveOperation()
		{
			_operation1 = () =>
			              	{
			              		Thread.Sleep(2000);
			              		return Maybe.From(42);
			              	};

			_operation2 = () =>
			              	{
			              		Thread.Sleep(5000);
								return Maybe<int>.None;
			              	};
		}

		public Maybe<int> Compute()
		{
			var stopwatch = new Stopwatch();
			stopwatch.Start();
			
			var result = _operation1().Concat(_operation2());
			
			stopwatch.Stop();

			Console.WriteLine("Time taken: {0}", stopwatch.Elapsed);
			return result;
		}
	}


	internal static partial class EnumerableExtensions
	{
		public static Maybe<T> Concat<T>(this Maybe<T> source1, Maybe<T> source2)
		{
			return source1.IsNone
					? source2
					: source1;
		}
	}
}