HOTSPOT - You are reviewing the following code: For each of the following statements, select Yes if the statement is true. Otherwise, select No. Hot Area:
It's easy. The FlagAttribute makes this enum binary (or a bit field). With that you can now store more than one value into the enum by using the bitwise OR operator |
For example
var adminOnly = UserGroup.Administartor // adminOnly = 8
var moreGroups = UserGroup.Administrator | UserGroup.User // moreGroups = 9
var oneMOre = UserGroup.User | UserGroup.Manager | UserGroup.Supervisor // oneMOre = 7
The enum then also has a method called "HasFlag" to check if a variable contains a certain enum flag.
moreGroups.HasFlag(UserGroup.Manager) // false => 9 - 4 = 5, there is no enum with value 5.
moreGroups.HasFlag(UserGroup.User) // true 9 - 1 = 8 => 8 admin does exist and user so this matches
Answers are yes,yes,no. First yes is because of FlagsAtrribute(see official doc),second yes is trivial, but for last question answer is no because " lt; " doesn't mean nothing in c#. Thats my opninion!!!
upvoted 7 times
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