seal concrete classes

Author: smdn

src/Smdn.Net.AddressResolution/Smdn.Net.NeighborDiscovery/ArpScanCommandNeighborDiscoverer.cs

@@ -12,7 +12,7 @@
 
 namespace Smdn.Net.NeighborDiscovery;
 
-public class ArpScanCommandNeighborDiscoverer : RunCommandNeighborDiscovererBase {
+public sealed class ArpScanCommandNeighborDiscoverer : RunCommandNeighborDiscovererBase {
   // ref: https://manpages.ubuntu.com/manpages/jammy/man1/arp-scan.1.html
   //   --numeric: IP addresses only, no hostnames.
   //   --quiet: Only display minimal output. No protocol decoding.

src/Smdn.Net.AddressResolution/Smdn.Net.NeighborDiscovery/IpHlpApiNeighborTable.cs

@@ -21,7 +21,7 @@
 
 namespace Smdn.Net.NeighborDiscovery;
 
-public class IpHlpApiNeighborTable : INeighborTable {
+public sealed class IpHlpApiNeighborTable : INeighborTable {
   public static bool IsSupported => RuntimeInformation.IsOSPlatform(OSPlatform.Windows) && lazyIsSupported.Value;
 
   private static readonly Lazy<bool> lazyIsSupported = new(

src/Smdn.Net.AddressResolution/Smdn.Net.NeighborDiscovery/NmapCommandNeighborDiscoverer.cs

@@ -11,7 +11,7 @@
 
 namespace Smdn.Net.NeighborDiscovery;
 
-public class NmapCommandNeighborDiscoverer : RunCommandNeighborDiscovererBase {
+public sealed class NmapCommandNeighborDiscoverer : RunCommandNeighborDiscovererBase {
   // ref: https://nmap.org/book/man-briefoptions.html
   //   -sn: Ping Scan - disable port scan
   //   -n: Never do DNS resolution

src/Smdn.Net.AddressResolution/Smdn.Net.NeighborDiscovery/NullNeighborDiscoverer.cs

@@ -8,7 +8,7 @@
 
 namespace Smdn.Net.NeighborDiscovery;
 
-public class NullNeighborDiscoverer : INeighborDiscoverer {
+public sealed class NullNeighborDiscoverer : INeighborDiscoverer {
   public static readonly NullNeighborDiscoverer Instance = new();
 
   public ValueTask DiscoverAsync(CancellationToken cancellationToken) => default;

src/Smdn.Net.AddressResolution/Smdn.Net.NeighborDiscovery/ProcfsArpNeighborTable.cs

@@ -20,7 +20,7 @@
 
 namespace Smdn.Net.NeighborDiscovery;
 
-public class ProcfsArpNeighborTable : INeighborTable {
+public sealed class ProcfsArpNeighborTable : INeighborTable {
   private const string PathToProcNetArp = "/proc/net/arp";
 
   public static bool IsSupported => File.Exists(PathToProcNetArp);