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Re: [Qemu-devel] [PATCH] qobject: Use qobject_to() instead of type cast
From: |
Marc-André Lureau |
Subject: |
Re: [Qemu-devel] [PATCH] qobject: Use qobject_to() instead of type cast |
Date: |
Thu, 26 Apr 2018 20:59:40 +0200 |
On Thu, Apr 26, 2018 at 5:28 PM, Markus Armbruster <address@hidden> wrote:
> The proper way to convert from (abstract) QObject to a (concrete)
> subtype is qobject_to(). Look for offenders that type cast instead:
>
> $ git-grep '(Q[A-Z][a-z]* \*)'
> hmp.c: qmp_device_add((QDict *)qdict, NULL, &err);
> include/qapi/qmp/qobject.h: return (QObject *)obj;
> qobject/qobject.c:static void (*qdestroy[QTYPE__MAX])(QObject *) = {
> tests/check-qdict.c: dst = (QDict *)qdict_crumple(src, &error_abort);
>
> The first two cast away const, the third isn't a type cast. Fix the
> fourth.
>
> Signed-off-by: Markus Armbruster <address@hidden>
Reviewed-by: Marc-André Lureau <address@hidden>
> ---
> tests/check-qdict.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tests/check-qdict.c b/tests/check-qdict.c
> index a0e0454684..eba5d3528e 100644
> --- a/tests/check-qdict.c
> +++ b/tests/check-qdict.c
> @@ -657,7 +657,7 @@ static void qdict_crumple_test_empty(void)
>
> src = qdict_new();
>
> - dst = (QDict *)qdict_crumple(src, &error_abort);
> + dst = qobject_to(QDict, qdict_crumple(src, &error_abort));
>
> g_assert_cmpint(qdict_size(dst), ==, 0);
>
> --
> 2.13.6
>