42 lines
927 B
C#
42 lines
927 B
C#
//
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// Author:
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// Jb Evain (jbevain@gmail.com)
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//
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// Copyright (c) 2008 - 2015 Jb Evain
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// Copyright (c) 2008 - 2011 Novell, Inc.
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//
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// Licensed under the MIT/X11 license.
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//
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using System;
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using System.Collections.Generic;
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namespace MonoFN.Cecil.Rocks {
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static class Functional {
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public static System.Func<A, R> Y<A, R> (System.Func<System.Func<A, R>, System.Func<A, R>> f)
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{
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System.Func<A, R> g = null;
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g = f (a => g (a));
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return g;
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}
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public static IEnumerable<TSource> Prepend<TSource> (this IEnumerable<TSource> source, TSource element)
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{
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if (source == null)
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throw new ArgumentNullException ("source");
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return PrependIterator (source, element);
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}
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static IEnumerable<TSource> PrependIterator<TSource> (IEnumerable<TSource> source, TSource element)
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{
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yield return element;
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foreach (var item in source)
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yield return item;
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}
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}
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}
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