From fb277d105c273a096b5198e461f45d059368e0a2 Mon Sep 17 00:00:00 2001
From: Kolan Sh <backbone@backbone.ws>
Date: Sat, 15 Aug 2015 13:46:56 +0300
Subject: [PATCH] Vala: EvenNumbers.

---
 vala/EvenNumbers/main.vala | 47 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 vala/EvenNumbers/main.vala

diff --git a/vala/EvenNumbers/main.vala b/vala/EvenNumbers/main.vala
new file mode 100644
index 0000000..2210822
--- /dev/null
+++ b/vala/EvenNumbers/main.vala
@@ -0,0 +1,47 @@
+public class EvenNumbers {
+	public int get(int index) {
+		return index * 2;
+	}
+
+	public bool contains(int i) {
+		return i % 2 == 0;
+	}
+
+	public string to_string() {
+		return "[This object enumerates even numbers]";
+	}
+
+	public Iterator iterator() {
+		return new Iterator(this);
+	}
+
+	public class Iterator {
+		private int index;
+		private EvenNumbers even;
+
+		public Iterator(EvenNumbers even) {
+			this.even = even;
+		}
+
+		public bool next() {
+			return true;
+		}
+
+		public int get() {
+			this.index++;
+			return this.even[this.index - 1];
+		}
+	}
+}
+
+void main() {
+	var even = new EvenNumbers();
+	stdout.printf("%d\n", even[5]);
+	if (4 in even) {
+		stdout.printf(@"$even\n");
+	}
+	foreach (var i in even) {
+		stdout.printf("%d\n", i);
+		if (i == 20) break;
+	}
+}