Il 18/05/2018 21:27, Jason H ha scritto:
I've got a QVariantMap that contains QVariantMaps. (I kinda posted about this Wednesday, when I was having a few issues at the same time). I'm essentially trying to domap["a"]["b"]["c"] = QPoint(0,0); However, because I'm using QVariant maps, I have to do: QVariantMap a = map["a"].toMap(); QVariantMap b = a["b"].toMap(); b["c"]=QPoint(0,0); But that detaches from b and gives me a new container modified b, and it doesnt appear in the hierarchy. I have to:
This has nothing to do with detaching / COW; this has to do with the fact that toMap() gives you a _copy_ of the contents of the variant at a["b"]. From that moment on you're modifying b, which is a totally independent object from the one contained in a["b"]. As far as I know, there's no API to avoid the copy and reference directly the contents of a variant.
My 2 c, -- Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Senior Software Engineer KDAB (France) S.A.S., a KDAB Group company Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com KDAB - The Qt, C++ and OpenGL Experts
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