"Sterne, Jason (Nokia - CA/Ottawa)" <[email protected]> writes:
> Hi all,
>
> I saw some recent questions about 'when' statements. I had another one
> related to evaluating 'when' statements that involve leafs that don't
> currently have a value at all.
>
> leaf foo {
> type enumeration {
> enum val1;
> enum val2;
> }
> }
>
> leaf bar {
> when "../foo != 'val2'";
> type uint8;
> }
>
> Notice that foo does not have a default statement. So if no manager has set
> leaf foo, it doesn't exist in the config.
>
> In that case, does the "when" statement evaluate to 'true' (i.e. leaf bar is
> allowed to have a value) ?
>
> i.e. assuming leaf foo is not set at all, is this accepted?
> <bar>23</bar>
>
> Or is there something special here because of the non-existence of leaf foo?
>
> If the "when" evaluates to 'false', then does the following "when" evaluate
> differently than the one above?
> when "not(../foo = 'val2')";
Indeed it does. If the "foo" instance doesn't exist, then this expression
evaluates to true.
Lada
>
> Jason
> _______________________________________________
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> [email protected]
> https://www.ietf.org/mailman/listinfo/netmod
--
Ladislav Lhotka
Head, CZ.NIC Labs
PGP Key ID: 0xB8F92B08A9F76C67
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