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/Mono.Cecil/rocks/Mono.Cecil.Rocks/Functional.cs

http://github.com/icsharpcode/ILSpy
C# | 59 lines | 24 code | 8 blank | 27 comment | 2 complexity | 9a2354dcecb9f1174977d546fde55653 MD5 | raw file
 1//
 2// Functional.cs
 3//
 4// Author:
 5//   Jb Evain (jbevain@gmail.com)
 6//
 7// Copyright (c) 2008 - 2011 Jb Evain
 8//
 9// Permission is hereby granted, free of charge, to any person obtaining
10// a copy of this software and associated documentation files (the
11// "Software"), to deal in the Software without restriction, including
12// without limitation the rights to use, copy, modify, merge, publish,
13// distribute, sublicense, and/or sell copies of the Software, and to
14// permit persons to whom the Software is furnished to do so, subject to
15// the following conditions:
16//
17// The above copyright notice and this permission notice shall be
18// included in all copies or substantial portions of the Software.
19//
20// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27//
28
29using System;
30using System.Collections.Generic;
31
32namespace Mono.Cecil.Rocks {
33
34	static class Functional {
35
36		public static System.Func<A, R> Y<A, R> (System.Func<System.Func<A, R>, System.Func<A, R>> f)
37		{
38			System.Func<A, R> g = null;
39			g = f (a => g (a));
40			return g;
41		}
42
43		public static IEnumerable<TSource> Prepend<TSource> (this IEnumerable<TSource> source, TSource element)
44		{
45			if (source == null)
46				throw new ArgumentNullException ("source");
47
48			return PrependIterator (source, element);
49		}
50
51		static IEnumerable<TSource> PrependIterator<TSource> (IEnumerable<TSource> source, TSource element)
52		{
53			yield return element;
54
55			foreach (var item in source)
56				yield return item;
57		}
58	}
59}