86 lines
1.0 KiB
C#
86 lines
1.0 KiB
C#
// Compiler options: -langversion:default
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//
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// Use
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using System;
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using System.Collections;
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class X {
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static IEnumerable GetIt ()
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{
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List l = new List (3);
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l.Add (1);
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l.Add (2);
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l.Add (3);
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foreach (int i in l)
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yield return i;
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}
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public static int Main ()
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{
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int total = 0;
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foreach (int i in GetIt ()) {
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Console.WriteLine ("Got: " + i);
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total += i;
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}
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return total == 6 ? 0 : 1;
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}
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}
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public class List : IEnumerable {
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int pos = 0;
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int [] items;
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public List (int i)
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{
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items = new int [i];
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}
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public void Add (int value)
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{
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items [pos ++] = value;
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}
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public MyEnumerator GetEnumerator ()
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{
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return new MyEnumerator(this);
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}
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IEnumerator IEnumerable.GetEnumerator ()
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{
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return GetEnumerator ();
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}
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public struct MyEnumerator : IEnumerator {
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List l;
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int p;
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public MyEnumerator (List l)
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{
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this.l = l;
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p = -1;
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}
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public object Current {
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get {
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return l.items [p];
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}
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}
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public bool MoveNext()
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{
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return ++p < l.pos;
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}
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public void Reset()
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{
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p = 0;
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}
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}
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}
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