System.Net.Topology.NetMaskExtensions.GetSiblingCount C# (CSharp) Method

        public static int GetSiblingCount(this NetMask mask, SiblingOptions options)
        {
            if (mask == null)
                throw new ArgumentNullException(nameof(mask));

            bool includeSelf = BitHelper.IsOptionSet(options, SiblingOptions.IncludeSelf);
            bool includeBroadcast = BitHelper.IsOptionSet(options, SiblingOptions.IncludeBroadcast);
            bool includeNetworkIdentifier = BitHelper.IsOptionSet(options, SiblingOptions.IncludeNetworkIdentifier);

            var hostPartBits = mask.GetMaskBytes().CountFromRight(false);
            var total = 1 << hostPartBits;
            total -= includeSelf ? 0 : 1;
            total -= includeBroadcast ? 0 : 1;
            total -= includeNetworkIdentifier ? 0 : 1;

            // TODO: Testing

            return total;
        }
    }