Pavel Emelyanov b86d11cf67 updateable_value: Support dummy observing ...

An updateable_value() may come without source attached. One of the
options how this can happen is if the value sits on a service config.
It's a good option to make the config have some default initialization
for the option, but in this case observe()ing an option by the service
would step on null pointer dereference.

Said that, if a value without source is tried to be observed -- assume
that it's OK, but the value would never change, so a dummy observer is
to be provided.

Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>

2022-07-06 08:17:08 +03:00

4.4 KiB

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