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qapi: Add qobject_is_equal()

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This generic function (along with its implementations for different
types) determines whether two QObjects are equal.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-id: 20171114180128.17076-4-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2017-11-14 19:01:25 +01:00
parent 254bf807e5
commit b38dd678a2
14 changed files with 186 additions and 0 deletions
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29
qobject/qobject.c
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@ -27,3 +27,32 @@ void qobject_destroy(QObject *obj)
assert(QTYPE_QNULL < obj->type && obj->type < QTYPE__MAX);
qdestroy[obj->type](obj);
}
static bool (*qis_equal[QTYPE__MAX])(const QObject *, const QObject *) = {
[QTYPE_NONE] = NULL, /* No such object exists */
[QTYPE_QNULL] = qnull_is_equal,
[QTYPE_QNUM] = qnum_is_equal,
[QTYPE_QSTRING] = qstring_is_equal,
[QTYPE_QDICT] = qdict_is_equal,
[QTYPE_QLIST] = qlist_is_equal,
[QTYPE_QBOOL] = qbool_is_equal,
};
bool qobject_is_equal(const QObject *x, const QObject *y)
{
/* We cannot test x == y because an object does not need to be
* equal to itself (e.g. NaN floats are not). */
if (!x && !y) {
return true;
}
if (!x || !y || x->type != y->type) {
return false;
}
assert(QTYPE_NONE < x->type && x->type < QTYPE__MAX);
return qis_equal[x->type](x, y);
}