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qobject: use a QObjectBase_ struct

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By moving the base fields to a QObjectBase_, QObject can be a type
which also has a 'base' field. This allows writing a generic QOBJECT()
macro that will work with any QObject type, including QObject
itself. The container_of() macro ensures that the object to cast has a
QObjectBase_ base field, giving some type safety guarantees. QObject
must have no members but QObjectBase_ base, or else QOBJECT() breaks.

QObjectBase_ is not a typedef and uses a trailing underscore to make
it obvious it is not for normal use and to avoid potential abuse.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180419150145.24795-3-marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Marc-André Lureau 2018-04-19 17:01:42 +02:00 • committed by Markus Armbruster
parent 7ee9edfdb1
commit 3d3eacaecc
9 changed files with 35 additions and 26 deletions
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2
include/qapi/qmp/qnull.h
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@ -16,7 +16,7 @@
#include "qapi/qmp/qobject.h"
struct QNull {
QObject base;
struct QObjectBase_ base;
};
extern QNull qnull_;