Fixing this in Qt 5 would be BIC. Although it could be okayish, there are many more classes that shouldn't be copyable. I need to go through clazy's output and fix them, and would rather do this noise for Qt 6 and leave Qt 5 alone and purely BIC free. Added a move-ctor and move-assign, as well as swap(), deprecated copy-ctor and copy-assign. The new copy special member functions warn at runtime if they are called. In order to not pollute client code with the warning strings, lock them away by defining the functions out-of-line. [ChangeLog][QtCore][QBasicTimer] QBasicTimer is now a move-only class. Copying is now deprecated and will be removed in Qt 6. [ChangeLog][QtCore][QBasicTimer] Added swap() member and free function. Change-Id: Ic3e6a26f3989d4c8d125c06e8b0b825411c6e106 Done-with: Marc Mutz <marc.mutz@kdab.com> Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>