Using Bitwise operators on flags

Question

I have four flags

Current = 0x1  
Past = 0x2  
Future = 0x4  
All = 0x7

Say I receive the two flags Past and Future (setFlags(PAST

Answer 1

An addendum to Marc Gravell and Vilx-'s answer:

Your flagged enum shouldn't specify the amount for "All", it should just include your existing values. This goes for any calculated values.

[Flags]
public enum Time
{
    None = 0,
    Current = 1,
    Past = 2,
    Future = 4,
    All = Current | Past | Future
}

Note that Vilx- removed the use of Hexadecimal for values. This is important because once you're past 0x8, your values will have to comply with Hex. You should just stay in decimal.

EDIT: I also want to add that you can use bit shifting rather than hex/decimal.

This looks like:

[Flags]
public enum Time
{
    None = 0,
    Current = 1,
    Past = 1 << 1, // 2, 10 binary
    Future = 1 << 2, // 4, 100 binary
    All = Current | Past | Future
}