== Why is this an issue?

This rule raises an issue when an externally visible enumeration is marked with ``++FlagsAttribute++`` and one, or more, of its values is not a power of 2 or a combination of the other defined values.


=== Noncompliant code example

[source,csharp]
----
using System;

namespace MyLibrary
{
    [Flags]
    public enum Color // Noncompliant, Orange is neither a power of two, nor a combination of any of the defined values
    {
        None    = 0,
        Red     = 1,
        Orange  = 3,
        Yellow  = 4
    }
}
----


=== Compliant solution

[source,csharp]
----
using System;

namespace MyLibrary
{
    public enum Color // Compliant - no FlagsAttribute
    {
        None = 0,
        Red = 1,
        Orange = 3,
        Yellow = 4
    }

    [Flags]    
    public enum Days    
    {        
        None = 0,        
        Monday = 1,        
        Tuesday = 2,        
        Wednesday = 4,        
        Thursday = 8,        
        Friday = 16,        
        All = Monday| Tuesday | Wednesday | Thursday | Friday    // Compliant - combination of other values
    }
}
----


ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

=== Message

Remove the "FlagsAttribute" from this enum.


=== Highlighting

Primary: Enum declaration

Secondaries: Enum values that are raising the issue


endif::env-github,rspecator-view[]