From: "Florian G. Pflug" Date: 2005-01-05T22:59:47+09:00 Subject: Re: Standardlib "ipaddr.rb" --------------ms000000070204040909030005 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Markus Werner wrote: > Hi Again, > > No a wrapper class is not the right solution in my opinion. It is a more > basic problem. > > Yesterday night I was thinking about this problem. I came to the point, that > this implementation is brocken in any case. So it is not good to have as a > standard lib. > There are some reasons. But cause it is hard to argue if things are mixed up. > I try to split this case into 2 parts. IMHO there are three distinct cases, each of which should be represented by a Class. IpNetwork: Represents a network/ip-prefix, e.g. 192.168.0.0/16, or 192.168.1.0/24, but not 192.168.1.1/24, because it's not a network. IpAddress: Represents an ip-address, without netmask IpInterface: Represents an ip-address in a certain network, e.g 192.168.1.1/24. I'm not sure if 192.168.0.0 is a valid ip-address in the 192.168.0.0/24 network... IpNetwork could be implemented using IpAddress, and IpInterface could be implemented using an IpNetwork, and an IpAddress. The methods of IpInterface should be (approximatly) the union of the methods of IpNetwork and IpAddress, since it represents both. --------------ms000000070204040909030005 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIL4DCC BewwggVVoAMCAQICAzAABDANBgkqhkiG9w0BAQQFADCByDELMAkGA1UEBhMCQVQxDzANBgNV BAgTBlZpZW5uYTEPMA0GA1UEBxMGVmllbm5hMSEwHwYDVQQKExhzb2x1dGlvbi14IFNvZnR3 YXJlIEdtYkgxHjAcBgNVBAsTFUNlcnRpZmljYXRlIEF1dGhvcml0eTEqMCgGA1UEAxMhc29s dXRpb24teDo6Y2VydGlmaWNhdGUtYXV0aG9yaXR5MSgwJgYJKoZIhvcNAQkBFhlob3N0bWFz dGVyQHNvbHV0aW9uLXguY29tMB4XDTA0MTAwODE4MTkxN1oXDTA5MTAwODE4MTkxN1owgdUx CzAJBgNVBAYTAkFUMQ8wDQYDVQQIEwZWaWVubmExDzANBgNVBAcTBlZpZW5uYTEhMB8GA1UE ChMYc29sdXRpb24teCBTb2Z0d2FyZSBHbWJIMSkwJwYDVQQKEyBjMjFmOTY5YjVmMDNkMzNk 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