Started work on the 'crowd' package.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3935 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/Iterator.as

@@ -0,0 +1,23 @@
+package com.threerings.util {
+
+/**
+ * Java has Iterator, ActionScript has IViewCursor.
+ * The problem is, IViewCursor defines 14 methods and 5 read-only properties.
+ * That is a serious PITA to write for every collection that might desire
+ * iteration. This provides a simpler alternative.
+ */
+public interface Iterator
+{
+    /**
+     * Is there another element available?
+     */
+    function hasNext () :Boolean;
+
+    /**
+     * Returns the next element.
+     */
+    function next () :Object;
+
+    // TODO: remove() ?
+}
+}