mcs/tests/gtest-iter-13.cs

   1 using System;
   2 using System.Collections;
   3 using System.Collections.Generic;
   4
   5 class C<T>
   6 {
   7         public IEnumerator GetEnumerator ()
   8         {
   9                 return new T[0].GetEnumerator ();
  10         }
  11
  12         public IEnumerable<T> Filter (Func<T, bool> predicate)
  13         {
  14                 foreach (T item in this)
  15                         if (predicate (item))
  16                                 yield return item;
  17         }
  18 }
  19
  20 class M
  21 {
  22         public static void Main ()
  23         {
  24                 foreach (var v in new C<long>().Filter(null)) {
  25                 }
  26         }
  27 }