Multiple inheritance, why why why....

[Hendrik Bäcker]

Hi Taylor,

Taylor Dondich schrieb:
> First off, was there REALLY a need for multiple inheritance?  It's
> something that I think would REALLY stab you in the foot.  With a well
> planned template structure with single inheritance, I'd think you'd
> resolve any issue.   However, because we have it, it's good to
> understand it.
>
> Does anyone want to explain to me WHY it was chosen that the
> precedence order of variables go from left to right, instead of right
> to left?  I mean, if you have the following:
>
> define host {
>   host_name testhost
>   use templatea, templateb
> }
>
> And both templates have different values for check_interval.  That the
> value in templatea is the one used instead of the one from templateb.
> That's how the docs describe it.  Does it make sense to most people
> that this is "correct" or would you think it'd be the other way?
>   
Left to right, right to left where's the different if you know how it
works? Something had to be choosen so the devels might thought: "First
come, first serve" might be a good thing.
>From left to right, the configuration (wo)men only must think off: "The
first directive set will be taken from a template, but it can be
overwritten be the atomic service object".

But I see there would be a logic for the other way too: "generic-service
for all, then the closer special ones" - but anyway: I would say it's to
late to discuss this. Many people out there has already Nagios3, they
might alreade use multiple inheritance in the actual way.
> I'm writing a configuration tool and visually it's a vertical list, so
> my idea is that the bottom level template overrides any values from
> upper templates.  It just seems weird.
>   
1. Please not another config tool - there are too many half ready tools
out there.
2. Who must change in your opinion? Nagios to your config tool or vice
versa? (SCNR)

Regards,
Hendrik

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