Re: [Cbor] Supporting IPv6 Link-Local with scope (was Re: Éric Vyncke's Discuss on draft-ietf-cbor-network-addresses-09: (with DISCUSS and COMMENT))
Thiago Macieira <thiago.macieira@intel.com> Thu, 07 October 2021 18:42 UTC
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From: Thiago Macieira <thiago.macieira@intel.com>
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Date: Thu, 07 Oct 2021 11:42:09 -0700
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Subject: Re: [Cbor] Supporting IPv6 Link-Local with scope (was Re: Éric Vyncke's Discuss on draft-ietf-cbor-network-addresses-09: (with DISCUSS and COMMENT))
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On Thursday, 7 October 2021 11:31:54 PDT Michael Richardson wrote: > > - Is "false" for a prefix length a better choice than using either -1 > > or null? > We've gone for null. false, null, 0, -1 and an empty string all have the same length and meaning for interfaces indices and names. Null makes the purpose clear (information absent) and the distinction between that and 0 might be important somewhere. Like C++ std::optional<PointerType>: a disengaged optional is different from a an engaged optional containing a null pointer. One of those may convey "an error occurred" whereas the other says "success, information not applicable". Though I'd suggest using undefined for errors in CBOR, instead of null. So maybe a null interface is "valid, but missing", an undefined interface is "invalid, error" and a zero/empty interface is "not applicable in this context" (such as all non-link-local cases). -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel DPG Cloud Engineering
- [Cbor] Éric Vyncke's Discuss on draft-ietf-cbor-n… Éric Vyncke via Datatracker
- [Cbor] Deprecating tags and Ethernet address in d… Michael Richardson
- Re: [Cbor] Éric Vyncke's Discuss on draft-ietf-cb… Michael Richardson
- [Cbor] Supporting IPv6 Link-Local with scope (was… Michael Richardson
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Eric Vyncke (evyncke)
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Carsten Bormann
- Re: [Cbor] Deprecating tags and Ethernet address … Donald Eastlake
- Re: [Cbor] Deprecating tags and Ethernet address … Erik Kline
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Erik Kline
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Brian E Carpenter
- Re: [Cbor] Deprecating tags and Ethernet address … Donald Eastlake
- Re: [Cbor] Deprecating tags and Ethernet address … Michael Richardson
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Thiago Macieira
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Michael Richardson
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Brian E Carpenter
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Carsten Bormann
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Michael Richardson
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Michael Richardson
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Brian E Carpenter
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Carsten Bormann
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Carsten Bormann
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Brian E Carpenter
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Jürgen Schönwälder
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Carsten Bormann
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Rob Wilton (rwilton)
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Carsten Bormann
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Jürgen Schönwälder
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Rob Wilton (rwilton)
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Carsten Bormann
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Carsten Bormann
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Erik Kline
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Barry Leiba
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Michael Richardson
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Thiago Macieira
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Brian E Carpenter
- Re: [Cbor] Supporting IPv6 Link-Local with scope … Brian E Carpenter