实现单例类对于ActionScript [英] implementing singleton class for Actionscript

问题描述

我知道动作不容许私人contstructor在任何时间，但是如果我想要写在行动脚本sinlgleton类，因此如何在动作执行。

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.

任何人都可以提供ActionScript中的单件模式的一个样本例子吗？

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

推荐答案

我用的是这样的：

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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