~bas-dotbas/do/win32-next

// Enumerable.cs created with MonoDevelop

// User: david at 12:49 PM 10/21/2008

//

// To change standard headers go to Edit->Preferences->Coding->Standard Headers

//

 

using System;

using System.Collections.Generic;

 

namespace Do

{

        public static class Enumerable

        {

 

                public static T Aggregate<T> (IEnumerable<T> self, Func<T, T, T> f)

                {

                        T acc;

                        bool first = true;

                        foreach (T x in self) {

                                acc = first ? x : f (acc, x);

                                first = false;

                        }

                        return acc;

                }

 

                public static T2 Aggregate<T1, T2> (IEnumerable<T1> self, T2 acc, Func<T2, T1, T2> f)

                {

                        foreach (T1 x in self)

                                acc = f (acc, x);

                        return acc;

                }

 

                public static T3 Aggregate<T1, T2, T3> (IEnumerable<T1> self, T2 acc, Func<T2, T1, T2> f, Func<T2, T3> f2)

                {

                        return f2 (Aggregate (self, acc, f));

                }

                        

                public static bool All<T> (this IEnumerable<T> self, Func<T, bool> p)

                {

                        foreach (T x in self)

                                if (!p (x)) return false;

                        return true;

                }

 

                public static bool Any<T> (this IEnumerable<T> self)

                {

                        foreach (T x in self)

                                return true;

                        return false;

                }

                

                public static bool Any<T> (this IEnumerable<T> self, Func<T, bool> p)

                {

                        foreach (T x in self)

                                if (p (x)) return true;

                        return false;

                }

 

                public static IEnumerable<T2> Select<T1, T2> (this IEnumerable<T1> self, Func<T1, T2> f)

                {

                        List<T2> xs = new List<T2> ();

                        foreach (T1 x in self)

                                xs.Add (f (x));

                        return xs;

                }

 

                public static IEnumerable<T> Where<T> (this IEnumerable<T> self, Func<T, bool> p)

                {

                        List<T> xs = new List<T> ();

                        foreach (T x in self)

                                if (p (x)) xs.Add (x);

                        return xs;

                }

        }

}