HasFlags always returns true for None (0) value in enum
c#, enum-flags, enums
Solution
`HasFlag` is effectively this:
HasFlag = (GivenFlag & Value) == GivenFlag;
//"Anything" AND 0 == 0 --> always true
Problem
This is the enum definition: ``` [Flags] enum Animals { None = 0, Dog = 1, Cat = 2, Horse = 4, Zebra = 8, } ``` Now, given the following code, why does the HasFlag method return true for the value Animals.None? ``` Animals myAnimals = Animals.Dog | Animals.Horse; var hasNone = myAnimals.HasFlag(Animals.None); //true! Why? var hasCat = myAnimals.HasFlag(Animals.Cat); //false var hasDog = myAnimals.HasFlag(Animals.Dog); //true var hasHorse = myAnimals.HasFlag(Animals.Horse); //true var hasZebra = myAnimals.HasFlag(Animals.Zebra); //false ```