测试在Flags Enum中仅设置一位 [英] Test that only a single bit is set in Flags Enum

问题描述

所以我有一个标记Enum

So I have a flags Enum

public Enum test
{
   test1 = 1,
   test2 = 2,
   test3 = 4,
   etc.
}

如何测试这一位，并且只设置了一位?

How can I test that one bit, and only one bit is set?

我以前已经100％完成了此操作，但是我现在的脑子没用！

I've 100% done this before but my mind is not working this am!

推荐答案

要检查数字中是否只设置了一位，数字(根据定义)必须为2的幂.因此，您可以使用以下内容进行测试:

To check that only a single bit is set in a number, the number must (by definition) be a power of two. As such, you can use the following to test:

int intVal = ((int)myEnumFlags);
bool singleBitIsSet = intVal != 0 && (intVal & (intVal-1)) == 0;

我最喜欢的这类东西参考:

My favorite reference for this kind of thing:

http://aggregate.org/MAGIC

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