// // Functional.cs // // Author: // Jb Evain (jbevain@gmail.com) // // Copyright (c) 2008 - 2011 Jb Evain // // 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. // using System; using System.Collections.Generic; namespace Mono.Cecil.Rocks { static class Functional { public static System.Func<A, R> Y<A, R> (System.Func<System.Func<A, R>, System.Func<A, R>> f) { System.Func<A, R> g = null; g = f (a => g (a)); return g; } public static IEnumerable<TSource> Prepend<TSource> (this IEnumerable<TSource> source, TSource element) { if (source == null) throw new ArgumentNullException ("source"); return PrependIterator (source, element); } static IEnumerable<TSource> PrependIterator<TSource> (IEnumerable<TSource> source, TSource element) { yield return element; foreach (var item in source) yield return item; } } }