Quote Originally Posted by tonnot View Post
Excuse me, but I think that I am not making so basic questions.
Of course, I'm learning c++ but I am not asking about how to declare a variable....
Ok, I'll treat you as a "programming grown-up" then.

Your problem is the implementation of the offending functions is provided by a precompiler that is ran on header files in search of the Q_OBJECT macro. Classes containing the macro are then scanned for keywords and definitions that later form the meta-object for the class which should then be included in the compilation and linked with the rest of object code. If qmake handles your build process then it pre-scans all files added to the variable containing the list of headers and if Q_OBJECT is spotted in any of them, the file is fed to moc and its result included in the compilation. So to solve your problem you need to make sure that moc preprocesses the files and its result is included in the rest of the compilation.