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qobject: Add a special null QObject

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I'm going to fix the JSON parser to recognize null.  The obvious
representation of JSON null as (QObject *)NULL doesn't work, because
the parser already uses it as an error value.  Perhaps we should
change it to free NULL for null, but that's more than I can do right
now.  Create a special null QObject instead.

The existing QDict, QList, and QString all represent something that
is a pointer in C and could therefore be associated with NULL.  But
right now, all three of these sub-types are always non-null once
created, so the new null sentinel object is intentionally unrelated
to them.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Markus Armbruster 2015-04-29 15:35:05 -06:00 • committed by Luiz Capitulino
parent a7c3181628
commit 481b002cc8
4 changed files with 43 additions and 2 deletions
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3
qobject/qjson.c
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@ -127,6 +127,9 @@ static void to_json_list_iter(QObject *obj, void *opaque)
static void to_json(const QObject *obj, QString *str, int pretty, int indent)
{
switch (qobject_type(obj)) {
case QTYPE_QNULL:
qstring_append(str, "null");
break;
case QTYPE_QINT: {
QInt *val = qobject_to_qint(obj);
char buffer[1024];