How should I check if a flag is set in a flags enum?

Question

Of the two methods below, which do you prefer to read? Is there another (better?) way to check if a flag is set? ``` bool CheckFlag(FooFlag fooFlag) { return fooFlag == (this.Foo & fooFlag); } ``` And ``` bool CheckFlag(FooFlag fooFlag) { return (this.Foo & fooFlag) != 0; } ``` Please vote up the method you prefer.

Accepted Answer

The two expressions do different things (if fooFlag has more than one bit set), so which one is better really depends on the behavior you want:

```
fooFlag == (this.Foo & fooFlag) // result is true iff all bits in fooFlag are set

(this.Foo & fooFlag) != 0       // result is true if any bits in fooFlag are set
```

How should I check if a flag is set in a flags enum?

Solution

Problem