static void Main(string[] args)
{
FriendlyEnum friendlyValue = FriendlyEnum.A;
EnemyEnum enemyValue = EnemyEnum.A;
// Outputs "true":
Console.WriteLine(friendlyValue.In(FriendlyEnum.A, FriendlyEnum.C));
// Outputs "false":
Console.WriteLine(friendlyValue.In(FriendlyEnum.B, FriendlyEnum.C));
// Both of these will result in compiler errors,
// because EnemyEnum is invading:
Console.WriteLine(friendlyValue.In(EnemyEnum.A, EnemyEnum.B));
Console.WriteLine(enemyValue.In(FriendlyEnum.A, FriendlyEnum.B));
}
public static bool In(this FriendlyEnum value, params FriendlyEnum[] list)
{
return(list.Contains(value));
}
