tree c006eca705e05b5fe33bd97a4021a28b8cf49fed
parent c1019828b612ffacea8408eec4a826a8ac601f13
author Ed Tanous <ed@tanous.net> 1709764887 -0800
committer Ed Tanous <ed@tanous.net> 1712184696 +0000

Clean up Ethernet to use readJson

Today, patching ethernet ip address arrays can use several
styles.

IpAddresses: [{}, {value: value}, null]

All 3 of those elements are legal.  Today, we unpack values like that
with nlohmann::json, then iterate and unpack further.  This leads to
problems where:

IpAddresses: [{}, {value: value}, 1.0]

would have the same behavior as the prior, given that we check for
"is_object()" to determine the null state.  This is messy at best, and
not typesafe at worst.

Changing this code to use the new class NullOr<> allows the readJson
parser to fail the second example.

Change-Id: Id91f48bb64271dd568041a7c0b1ad285b59d5674
Signed-off-by: Ed Tanous <ed@tanous.net>