28 lines
408 B
C#
28 lines
408 B
C#
using System;
|
|
using System.Collections;
|
|
using System.Collections.Generic;
|
|
|
|
class C<T>
|
|
{
|
|
public IEnumerator GetEnumerator ()
|
|
{
|
|
return new T[0].GetEnumerator ();
|
|
}
|
|
|
|
public IEnumerable<T> Filter (Func<T, bool> predicate)
|
|
{
|
|
foreach (T item in this)
|
|
if (predicate (item))
|
|
yield return item;
|
|
}
|
|
}
|
|
|
|
class M
|
|
{
|
|
public static void Main ()
|
|
{
|
|
foreach (var v in new C<long>().Filter(null)) {
|
|
}
|
|
}
|
|
}
|