Question

Morning all

从时间的开始,人类就希望并发明了在闪S3中进行列举的方法。

有许多尝试存在各种问题,例如能够利用建筑商制造新型um(不安全)。

我认为,以下是汇编时间的类型安全,并且可以安全地避免在运行时间产生新的 en类。

主要问题是,AS3公司没有能力拥有私人建筑。举例来说,施工商只有在通过私人静态的ENFORCER(ENFORCER)的情况下才能取得成功,而这种认证只在班级内可见。

package
{
    public class PermissionsEnum
    {

        private static const ENFORCER = new Object();

        public static const READ:PermissionsEnum = new PermissionsEnum(ENFORCER, 1);
        public static const WRITE:PermissionsEnum = new PermissionsEnum(ENFORCER, 2);
        public static const CREATE:PermissionsEnum = new PermissionsEnum(ENFORCER, 4);
        public static const DELETE:PermissionsEnum = new PermissionsEnum(ENFORCER, 8);

        private var _value:uint;

        public function PermissionsEnum(e:Object, v:uint)
        {
            if (e != ENFORCER)
                throw new Error("Attempted enum security breach.");

            this._value = v;
        }

        public function get value() : uint
        {
            return this._value;
        }

    }

}

以前的其他尝试使得某些微量参考材料(例如,Java汇编者脱节,C#汇编者允许这样做)成为一种试图阻止产生更多 en价值的尝试。我认为这更加美好。

我们认为什么?

法学硕士

Answer 1

您可在建筑商中使用更严格的时间限制(以下所有法规均载于PermissionsEnum.as/code>:



package
{
public class PermissionsEnum
{

    private static const ENFORCER:Enforcer = new Enforcer();

    public static const READ:PermissionsEnum = new PermissionsEnum(ENFORCER, 1);
    public static const WRITE:PermissionsEnum = new PermissionsEnum(ENFORCER, 2);
    public static const CREATE:PermissionsEnum = new PermissionsEnum(ENFORCER, 4);
    public static const DELETE:PermissionsEnum = new PermissionsEnum(ENFORCER, 8);

    private var _value:uint;

    public function PermissionsEnum(e:Enforcer, v:uint)
    {
        this._value = v;
    }

    public function get value() : uint
    {
        return this._value;
    }

}
}

class Enforcer
{
}

Answer 2


(1) 如何将价值观转化为成员?

(2) 我在创建<代码>PermissionsEnum时看到了一个问题:对其内值没有共同的控制。我指的是,如果我ve5-10名成员,就没有发现重复的价值观。但是,如果名单增加,也有可能在源头上犯错误:

public static const READ:PermissionsEnum = new PermissionsEnum(ENFORCER, 1);
public static const WRITE:PermissionsEnum = new PermissionsEnum(ENFORCER, 7);
public static const APPEND:PermissionsEnum = new PermissionsEnum(ENFORCER, 15);
public static const CREATE:PermissionsEnum = new PermissionsEnum(ENFORCER, 8);
public static const DELETE:PermissionsEnum = new PermissionsEnum(ENFORCER, 3);
public static const COMMIT:PermissionsEnum = new PermissionsEnum(ENFORCER, 6);
public static const SUBMIT:PermissionsEnum = new PermissionsEnum(ENFORCER, 21);
public static const POP:PermissionsEnum = new PermissionsEnum(ENFORCER, 22);
public static const PUSH:PermissionsEnum = new PermissionsEnum(ENFORCER, 3);
public static const SELECT:PermissionsEnum = new PermissionsEnum(ENFORCER, 17);
public static const DESELECT:PermissionsEnum = new PermissionsEnum(ENFORCER, 22);
public static const END:PermissionsEnum = new PermissionsEnum(ENFORCER, 15);

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