[Flags]
public enum Positions
{
None = 0,
Left = 1,
Right = 2,
Top = 4,
Bottom = 8,
}
public static class EnumerationExtensions
{
public static T Append(this Enum type, T value)
{
return (T)(object)(((int)(object)type | (int)(object)value));
}
public static T Remove(this Enum type, T value)
{
return (T)(object)(((int)(object)type & ~(int)(object)value));
}
public static bool Contains(this Enum type, T value)
{
return (((int)(object)type & (int)(object)value) == (int)(object)value);
}
public static bool ContainsAny(this Enum type, T value)
{
return (((int)(object)type & (int)(object)value) != 0);
}
public static bool ContainsNot(this Enum type, T value)
{
return !Contains(type, value);
}
public static bool Is(this Enum type, T value)
{
return (((int)(object)type == (int)(object)value));
}
}
then you'll be able to write tests like this :
Positions twoPositions = Positions.Left | Position.Top;
Console.WriteLine(twoPositions.Contains(Position.Top)) // true
Positions position = Positions.None;
position.Append(Position.Bottom);
Console.WriteLine(position.Is(Position.Bottom)); // true (None is overwritten)
