Problem
You want to ensure that only a single instance of an object exists.
Solution
ActionScript 3 does not support private or protected constructors preventing common implementation techniques for the singleton pattern. By using a static initializer and a check in the constructor, it is possible to ensure only a single instance of a class is created.
Detailed explanation
Inspired by Daniel Hai from Ted Patrick's JAM, under the following license http://www.onflex.org/license.html.
package
{
public final class Singleton
{
private static var _instance:Singleton = new Singleton();
public function Singleton()
{
if (_instance != null)
{
throw new Error("Singleton can only be accessed through Singleton.instance");
}
}
public static function get instance():Singleton
{
return _instance;
}
}
}
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