@oblivioncth said in std::unique_ptr with QObject derived class?: Won't let me mark your post as the answer for some reason. Sorry. Done for you :)

If someone needs a comprehensive 8 pages long explanation for what's exactly happening here, I recommend reading "Item 22: When using the Pimpl Idiom, define special member functions in the implementation file" from "Effective Modern C++" by Scott Meyers.