Sent: Thursday, October 26, 2017 at 4:58 PM From: "Konstantin Shegunov" <kshegu...@gmail.com> To: "Jason H" <jh...@gmx.com> Cc: "interestqt-project.org" <interest@qt-project.org> Subject: Re: [Interest] QMap crash when using QtConcurrent::blockingMapped()
On Thu, Oct 26, 2017 at 11:11 PM, Jason H <jh...@gmx.com[mailto:jh...@gmx.com]> wrote:It sometimes works, sometimes doesn't. Smells like a race. But in my software it seems to come from line 42: QList<QVector3D> hp = haystack_points[haystack_item]; This may be a write operation, beware of operator [] with maps, notice at the ends of the docs: "If the map contains no item with key key, the function inserts a default-constructed value into the map with key key, and returns a reference to it." My advice is to declare your members in `PointsCompare` as const and take it from there. The compiler will complain, but changing the access (e.g. using `at()` instead of `[]`) to your members should fix it. Maybe my use of a class with mapped() is wrong? Not that I could see. Well, remember that haystack_item is coming from search_keys which is the keys of the kaystack, so it *should* not be doing any writes. Still I will give it a go. The errors I got were about double-free or a heap integrity checksum not matching. I'm wondering if there isn't a reentrancy issue in QMap. _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
