为 Actionscript 实现单例类 [英] implementing singleton class for Actionscript

问题描述

我知道动作脚本在任何时候都不允许使用私有构造函数，但是如果我想在动作脚本中编写一个单例类那么如何在动作脚本中实现它.

I know actionscript does not allowed private contstructor at any time and But if i want to write a sinlgleton class in action script So how to implement it in actionscript.

谁能提供 actionscript 中单例模式的示例?

Can anyone provide an sample example of a singleton pattern in actionscript?

推荐答案

我使用的是这样的:

package singletons
{

    [Bindable]
    public class MySingleton
    {
        private static var _instance:MySingleton;

        public function MySingleton(e:Enforcer)  {
            if(e == null) {
                throw new Error("Hey!  You can't do that!  Call getInstance() instead!");
            }   
        }

        public static function getInstance():MySingleton {
            if(_instance == null) {
                _instance = new MySingleton (new Enforcer);
            }
            return _instance;
        }
    }
}

// an empty, private class, used to prevent outside sources from instantiating this locator
// directly, without using the getInstance() function....
class Enforcer{}

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