tree aa4cbaf0afc1b3df2e77347012f3efec8e88106c
parent a7ac313ce959bd1493b7fa5f80f4ba0cc445d687
author Patrick Williams <patrick@stwcx.xyz> 1637362168 -0600
committer Patrick Williams <patrick@stwcx.xyz> 1637587708 -0600

bus: reduce forward declaration for friendship

Generally we do not want users to be able to get the underlying `sd_bus`
pointer held by the `bus_t`, but there are a number of classes inside
sdbusplus that do need the bus so that they can make appropriate sd_bus
call.  Previously, we've required every one of these classes to be
forward declared inside `bus.hpp`, which is clutter.  Create a new
class, with a simple static function, which can be inherited by any
internal class and allows access to the underlying `sd_bus*`.

Refactor classes which were previously friends to now inherit from
this class.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ide0e7147801d01dc45b255261ba2cafefabddbb1