c++ – Undefined reference to vtable – Stack Overflow, c++ – Qt undefined reference to vtable – Stack Overflow, c++ – Undefined reference to vtable – Stack Overflow, c++ – Undefined reference to vtable – Stack Overflow, Qt C++ Q_ OBJECT error undefined reference to vtable . I am constantly running into problems while using the Q_ OBJECT macro: (I use QT Creator 2.8.1 / Qt 4.8.4) I asked before but it seems to be leading to even more trouble.
9/29/2018 · When I add Q_ OBJECT to my class declaration header, I get undefined reference to vtable for babel::MainWindow. Package Details (Include if Applicable) Package Name/Version: Qt/5.11 Operating System: Linux Fedora 28 Compiler+version: gcc-8.1.1 Steps to reproduce (Include if Applicable) here is my class declaration: class MainWindow : public QWidget, How to solve the error error : undefined reference to ‘ vtable for Widget’ in the example: #include #include #include #include class Widget : public QWidget { Q_ OBJECT public : Widget (QWidget *parent = nullptr) : QWidget (parent) { connect (&m_timer, &QTimer::timeout, this, &Widget::printMessage) } …
8/11/2010 · You get the “undefined reference to vtable ” error if you put your QObject -derived class in the implementation file because moc will not “add” the implementation of.
Reply Quote. 0. 1 Reply Last reply. sierdzio Moderators 7 Dec 2011, 01:33. last edited by. Right click on your project and select Run qmake to for a new build of MOC classes. It usually does run automatically, but sometimes it forgets to. @qxoz – vtable .
The compiler chooses to put the vtable in the same place as where the first declared virtual function is defined. Now if you for some reason forgot to provide a definition for that first virtual function declared in the object (or mistakenly forgot to add the compiled object at linking phase), you will get this error.
Qt Linker Error: “undefined reference to vtable” (6) Any time you add a new call to the Q_OBJECT macro, you need to run qmake again. The vtables issue you’re referring to is directly related to that. Just run qmake and you should be good to go assuming there are no other issues in your code.
3/5/2011 · Since there is no definition done anywhere, you’re code has some undefined references in the executables text segment which then results in linker errors. The simple solution is to run the meta object compiler (moc) provided by Qt. The moc creates the code for the functions defined by Q_OBJECT and everything works fine.
I delete macro Q_OBJECT ,and click run,then the programme is running normal P3. Error : undefined reference to vtable for. In summary, there are three key causes of the undefined reference to vtable error : A member function is missing its definition. An object file is not being linked. All virtual functions have inline definitions.
Description of Problem, Request, or Question. When I add Q_OBJECT to my class declaration header, I get undefined reference to vtable for babel::MainWindow. Package Details (Include if Applicable) Package Name/Version: Qt/5.11 Operating System: Linux Fedora 28 Compiler+version: gcc-8.1.1 Steps to reproduce (Include if Applicable)
