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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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2
qobject/Makefile.objs
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@ -1,3 +1,3 @@
util-obj-y = qint.o qstring.o qdict.o qlist.o qfloat.o qbool.o
util-obj-y = qnull.o qint.o qstring.o qdict.o qlist.o qfloat.o qbool.o
util-obj-y += qjson.o json-lexer.o json-streamer.o json-parser.o
util-obj-y += qerror.o