zad 6.6

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Mwzad66
{
    class Program
    {
        static void Main(string[] args)
        {
            IEnumerable<int> aa = new IEnumerable();
        }


    }

    public static class IenumerableExtend
    {
        public static bool IsEmpty<T>(this IEnumerable<T> input)
        {
            return input != null && input.Any();
        }

        public static void Mean(this IEnumerable<int> input)
        {
            //
        }
        public static void MeanLength(this IEnumerable<string> input)
        {
            //
        }
    }



    class Example : IEnumerable<string>
    {
        List<string> _elements;

        public Example(string[] array)
        {
            this._elements = new List<string>(array);
        }

        IEnumerator<string> IEnumerable<string>.GetEnumerator()
        {
            //Console.WriteLine("HERE");
            return this._elements.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return this._elements.GetEnumerator();
        }
    }

    class Program
    {
        static void Main()
        {
            Example example = new Example(
                new string[] { "cat", "dog", "bird" });
            // The foreach-loop calls the generic GetEnumerator method.
            // ... It then uses the List's Enumerator.
            foreach (string element in example)
            {
                Console.WriteLine(element);
            }
        }
    }

}