位在敲打红宝石 [英] Bit banging in ruby

问题描述

我想创建一个位，将包含安全权限给定用户。

I want to create a bit, that will contain security permissions for a given user.

在C＃中，我将通过创建一个枚举做到这一点，然后我会做一些位敲打二进制值，安定'和;＆放大器;'看它是否导致了真正的价值。

In c#, I would do this by creating an enumeration, and then I would do some bit banging on the binary value, by anding '&&' to see if it results in a TRUE value.

我怎样才能做到这一点最好的红宝石？

How can I do this best in Ruby?

推荐答案

如果潜在价值是非常重要的，那么你可以创建你使用像一个枚举模块

If the underlying value is important then you can create a module that you use like an enum

module Groups
  ADMIN = 1
  BOSS = 2
  CLERK = 4
  MEAT = 8
  BREAD = 16
  CHEESE = 32
end

要设置权限只是按位或在一起

To set permissions just bitwise or them together

permissions = Groups::BOSS | Groups::MEAT | Groups::CHEESE

和测试你做一个按位和

>> permissions & Groups::CHEESE > 0
=> true
>> permissions & Groups::BREAD > 0
=> false

我也喜欢你如何让实际的位掩码更具可读性与 _ 像这样

permissions = 0b0010_1010

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