Home > Undefined Reference > Error Undefined Reference To Vtable For Qt

Error Undefined Reference To Vtable For Qt

Contents

thanks so much. =] –user2619631 Jul 25 '13 at 18:20 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up If this error is in the widget's class, qmake might have failed to notice that the ui class vtable should be regenerated. This way you can try find the problem in your code. Make an ASCII bat fly around an ASCII moon more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile contact weblink

All methods in your classes are both defined in the headers (.h) and the source files (.cpp) 2. 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), more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation I'm sure you saved me hours of frustration!

Error Undefined Reference To Vtable For Qt

inspect the .a files with a tool or something? –Alex Black Jul 7 '09 at 23:08 Where is it located? Uncertainty principle Were students "forced to recite 'Allah is the only God'" in Tennessee public schools? Re-add it and recompile. –AMDG Apr 23 '15 at 8:29 Ok, for some weird reasons the file was not compiled by the MOC.

asked 1 year ago viewed 86 times active 1 year ago Related 64GCC C++ Linker errors: Undefined reference to 'vtable for XXX', Undefined reference to 'ClassName::ClassName()'31Qt Linker Error: “undefined reference to This it will need it for the constructor of Derived. Different precision for masses of moon and earth online N(e(s(t))) a string UV lamp to disinfect raw sushi fish slices Can't a user change his session information to impersonate others? Undefined Reference To `typeinfo For share|improve this answer answered Jun 17 '10 at 20:04 Stephen 24.8k53857 - Yes, CDasherComponent has a destructor body in the cpp.

class ISettings { public: virtual ~ISettings() {}; virtual void OKFunction() =0; virtual void ProblemFunction(); // missing =0 }; class Settings : ISettings { virtual ~Settings() {}; void OKFunction(); void ProblemFunction(); }; The Vtable Symbol May Be Undefined Because The Class Is Missing Its Key Function more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Can you explain why ths happens? http://stackoverflow.com/questions/7720205/linking-error-undefined-reference-to-vtable-for-xxx The compiler chooses to put the vtable in the same place as where the first declared virtual function is defined.

It also failed to create the vtable. Undefined Reference To Vtable For Destructor If you are dealing with inheritance the second google hit was what I had missed, ie. Code Polygon.h/.cpp #ifndef POLYGON_H #define POLYGON_H #include "Shape.h" #include "vector3f.h" class Polygon { public: Polygon(); virtual void Collide(Shape &s) = 0; virtual void Collide(Polygon &p) = 0; virtual bool Intersects(const Shape Browse other questions tagged c++ wxwidgets linker-error vtable or ask your own question.

The Vtable Symbol May Be Undefined Because The Class Is Missing Its Key Function

When does bugfixing become overkill, if ever? http://stackoverflow.com/questions/17865440/linker-error-undefined-reference-to-vtable Log in to Reply Rodrigo says: June 25, 2012 at 16:32 This may cause your problem:
class Mesh
{
public:
Mesh();
~Mesh();
virtual void Error Undefined Reference To Vtable For Qt im sorry its my fault that i copy the wrong one, ill change it then –Mary Grace Isanan Viaje Mar 1 '13 at 10:04 @MaryGraceIsananViaje Please see my updated Undefined Reference To Vtable For Constructor In my case, I thought I had replaced the declaration that used char *xml as the parameter with one using the unnecessarily troublesome const char *xml, but instead, I had created

So if you have a header which looks like this: #ifndef MESH_H #define MESH_H class Mesh { public: Mesh(); ~Mesh(); virtual void draw(); }; #endif // MESH_H You must at least have a peek at these guys How to find positive things in a code review? When does bugfixing become overkill, if ever? share|improve this answer edited Mar 1 '13 at 11:11 answered Mar 1 '13 at 10:02 Joachim Pileborg 212k15144255 thanks for your fast reply! Undefined Reference To Vtable For C++

objdump reports that the TestBench vtable is among the unresolved externals in TestBench.o Log in to Reply Gianni Comoretto says: July 30, 2013 at 18:45 Resolved. It is possible to compile the class without defining the virtual functions, but as soon as the linker tries to look up the function definitions it finds nothing and fails with You must provide an implementation for all non-pure virtual functions you declare. check over here This fixed the issue for me.

Help is appreciated. Undefined Reference To Vtable Qobject My code: class CGameModule : public CDasherModule { public: CGameModule(Dasher::CEventHandler *pEventHandler, CSettingsStore *pSettingsStore, CDasherInterfaceBase *pInterface, ModuleID_t iID, const char *szName) : CDasherModule(pEventHandler, pSettingsStore, iID, 0, szName) { g_pLogger->Log("Inside game module constructor"); This is probably a QtCreator related bug, this appens with QtCreator 3.3.2 from revision 3af3fe7ad3.

The solution was to declare at least one of the virtual functions' bodies outside the class declaration, like this: //----------------------------------------- // libbase.h class base { public: base() { } virtual ~base()

One hint is in the error message: [Linker error] main.o:main.cpp:(.text$_ZN7MachineC2Ev[Machine::Machine()]+0x8): undefined reference to `vtable for Machine' Here -------------------------------------------------^^^^^^^^^^^^^^^^ Implement the constructors and destructors and it should work. The code isn't too long, I'll post it below. Not the answer you're looking for? Undefined Reference To Vtable For Class C++ I looked for that online, yet still I couldn't find the problem.

When you use the class, you get the linker error. This file was compiled, but not linked, so the linker was complaining about being unable to find it. But the vtable had been discarded. http://cygnussoft.com/undefined-reference/lex-yy-c-undefined-reference-to-yywrap.html Log in to Reply Svenn-Arne Dragly says: May 11, 2012 at 00:23 Hi Teymoor, vtable errors are sometimes tricky to figure out.

Even defining ~Destructor = default; in the header file didn't help. At first, I thought it was related to forgetting to give a virtual function a body, but as far as I understand, everything is all here.