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Error Undefined Reference To Vtable For Qt

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thnx!!!! Subscribed! I've also cleaned the environment. Thanks you saved my time and effort. –Haider Aug 28 '12 at 10:19 Interesting that in my case it happens with 'pure virtuals' only! this contact form

Does Nietzsche's rejection of Socrates mean that he is a relativist about ethics? What was that alien in Doctor Who that nobody saw? asked 3 years ago viewed 1083 times active 3 years ago Related 64GCC C++ Linker errors: Undefined reference to 'vtable for XXX', Undefined reference to 'ClassName::ClassName()'32Qt Linker Error: “undefined reference to share|improve this answer edited Sep 6 at 14:40 Flow 15.1k766106 answered Jul 7 '09 at 23:11 Loki Astari 159k44229410 Are you referring to the order of the lib files http://stackoverflow.com/questions/7720205/linking-error-undefined-reference-to-vtable-for-xxx

Error Undefined Reference To Vtable For Qt

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 Output a googol copies of a string Development of retrosynthesis plan more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info omitted the " = 0" at the end of the declaration. You are describing the behaviour of one particular compiler; other compilers may behave differently, so playing games with declaration order to mask the error is not portable. –Mike Seymour Oct 11

  • One of these files should have main().
  • its just that im not sure if i did implement my constructor and destructor correctly, thanks for your reply by the way, i really appreciated it –Mary Grace Isanan Viaje Mar
  • share|improve this answer answered Feb 11 '14 at 23:01 Will 8011019 7 I don't need to ask a question.
  • If you can't figure it out, see if you can create a simple example that reproduces the error and post it here.
  • Made an error while pasting.
  • Given that ice is less dense than water, why doesn't it sit completely atop water (rather than slightly submerged)?

share|improve this answer answered Jun 12 '15 at 14:31 vitke 343 2 That would make no difference at all, you must have had the error elsewhere and inadvertantly fixed it. What is way to eat rice with hands in front of westerners such that it doesn't appear to be yucky? How do really talented people in academia think about people who are less capable than them? Undefined Reference To Vtable For C++ You'll probably find that you may have forgotten to define a virtual function ForgottenFunc in your fake class.

White Jul 7 '09 at 23:11 The third party lib files are here: /home/notroot/workspace/somelib-3/somelib/target/bin –Alex Black Jul 7 '09 at 23:13 | show 4 more comments 12 Answers 12 Undefined Reference To Vtable For Constructor g++ manual goes on the reading list! –Ben Nov 24 '10 at 23:38 add a comment| up vote 13 down vote I Just encountered the same problem, but my problem was Who was Mikael Blomkvist with at the end of the movie and why did Lisbeth hate it so much? http://stackoverflow.com/questions/15154980/linker-error-undefined-reference-to-vtable share|improve this answer answered Nov 8 '15 at 12:37 crw4096 1 add a comment| up vote 0 down vote It's also possible that you get a message like SomeClassToTest.host.o: In function

I had the following code in the class definition: class ScreenWidget : public QGLWidget { Q_OBJECT // must include this if you use Qt signals/slots ... }; I had to remove Undefined Reference To Vtt To summarize, I would say that if you've stared at the class long enough and can't see what possible syntax problem could be causing it, look for build issues like a You can now reproduce the error by removing = 0 in IBase.hpp. My class looked like this: //----------------------------------------- // libbase.h class base { public: base() { } virtual ~base() { } virtual int foo() { return 0; } } //----------------------------------------- //----------------------------------------- // libbase.cpp

Undefined Reference To Vtable For Constructor

and it is common practice to make the destructor virtual... What was the first operating system to feature a separate kernel? Error Undefined Reference To Vtable For Qt And defining a virtual destructor in this derived class made no difference (it is defined in the base class). The Vtable Symbol May Be Undefined Because The Class Is Missing Its Key Function share|improve this answer answered Feb 15 '13 at 14:36 frank 111 add a comment| up vote 0 down vote I had this error message when trying "hello world" like things with

Not the answer you're looking for? weblink qmake make clean make Should you still have trouble, make sure that qmake is actually generating your .moc files for any objects that need them. As a side effect, please note that only for this particular virtual function you won't get the traditional linker error like you are missing function foo. Running qmake -r will call moc and fix this problem. Undefined Reference To Vtable For Destructor

share|improve this answer answered Mar 7 '13 at 10:31 Bingo 1,25731322 add a comment| up vote 1 down vote Try to add virtual destructor to your class. Much like a normal linker error, it's because the compiler knew what you were talking about, but the linker couldn't find the definition. I'm not sure what other information I should provide. navigate here he doesn't need to define functions he doesn't use. –Dani Oct 11 '11 at 0:37 yes, and it would be replaced with undefined reference to Interval::~Interval.

For example: class Base { virtual void method1(); // throws undefined reference error. } Change the above declaration to the below one, it will work fine. Undefined Reference To Vtable For Class thanks –wanderameise Jan 30 '14 at 17:00 1 Also, if you forget to add the class to the *.pro file's HEADER's section you'll get the same error. share|improve this answer answered Jun 21 '10 at 18:22 RyanG 1,20631222 18 In brief : the .cpp just wasn't included in the build.

Omitting it didn't make a difference to compilation, but if you think it's a good idea, then thanks for the advice!

My groupproject suddenly stopped accepting new cpp files from one of my libs, it was all about undefined reference, then I switched positions and it worked as a charm. When everyone else gets your changes and runs make, make will see that the .pro file has changed and automatically run qmake. I'm betting that CCNode is code which belongs to somebody else. Undefined Reference To Vtable Qobject share|improve this answer answered Mar 7 '13 at 10:18 Pihhan 61739 add a comment| up vote 0 down vote Found it,,trying with the sample, here is an exmaple.

making new symbol from two symbols Tic Tac Toe - C++14 Enable Wireless on Fresh Debian Build Using DC in transformers? Enable Wireless on Fresh Debian Build Why do the Sparkfun and Adafruit Eagle libraries use smaller footprints than the manufacturer's recommended land pattern? E.g. his comment is here and the corresponding cpp file defines ALL the methods in the class template.

class.h: class MyClass { public: MyClass(); virtual ~MyClass(); }; class.cpp: MyClass::MyClass() {} It just gave me the vtable error message, and implementing the (empty) destructor solved the problem. [Edit] Thus, the Is there a developers image of 16.04 LTS? How do I ensure my code/project is 64bit? Why is this Sudoku Skyscraper Failing?

How can I fix it? I was adding the correct files to my Makefile.am template, but I wasn't sure which step in our build process actually created the makefile itself. Note on ROS and Catkin build system If you were compiling above set of classes in ROS using catkin build system then you will need following lines in CMakeLists.txt: add_executable(myclass src/myclass.cpp You have to be missing a virtual method to get a linker error on the vtable. –Mysticial Mar 24 '14 at 17:42 add a comment| up vote 0 down vote I

Join them; it only takes a minute: Sign up Linker Error undefined reference to vtable up vote 2 down vote favorite I seem to be having an issue with a wxWidgets My advisor refuses to write me a recommendation for my PhD application unless I apply to his lab Split python tuple in subtuples with capacity limit in functional programming style TNG 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 Former boss asking me to do presentations 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

Example: Objects requires: Open Close BatchRead BatchWrite Lib 1 provides: Open Close read write Lib 2 provides BatchRead (but uses lib1:read) BatchWrite (but uses lib1:write) If linked like this: gcc -o The problem was that I declared a virtual destructor in the header fileļ¼Œ but the virtual functions' body was actually not implemented. Check that all used libraries are included and check that you are also linking their dependencies. 6. Sum.cpp BasicMath.cpp in one go, or you can compile the .cpp files independently and then create the executable by calling g++ with both .o files.

The compiler chooses to put the vtable in the same place as where the first declared virtual function is defined. View all posts by Svenn-Arne Dragly Posted on January 3, 2010September 18, 2014Author Svenn-Arne DraglyCategories C++, Programming, Qt, TechnicalTags C++, cplusplus, errors, Programming 16 thoughts on “Fixing "undefined reference to `vtable Browse other questions tagged c++ linker g++ eclipse-cdt or ask your own question.