Linker Error Vtable For
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The Vtable Symbol May Be Undefined Because The Class Is Missing Its Key Function
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Undefined Reference To Vtable For C++
This question already has an answer here: What is an undefined reference/unresolved external symbol error and how do I fix it? 25 answers I'm hoping that you can help me with my problem, this program is a theater reservation program. main.cpp { #include here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting undefined reference to `typeinfo for ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 http://stackoverflow.com/questions/15154980/linker-error-undefined-reference-to-vtable million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up GCC C++ Linker errors: Undefined reference to 'vtable for XXX', Undefined reference to 'ClassName::ClassName()' up vote 64 down vote favorite 27 I'm setting up a C++ project, on Ubuntu x64, using Eclipse-CDT. I'm basically doing a hello world http://stackoverflow.com/questions/1095298/gcc-c-linker-errors-undefined-reference-to-vtable-for-xxx-undefined-refere and linking to a commerical 3rd party library. I've included the header files, linked to their libraries, but I still get linker errors. Are there some possible problems here other than the obvious (e.g. I am 99% sure I'm linking to the correct library). Is there a way to confirm the static libraries I am linking to are 64bit? Is there a way to confirm that the library has the class (and methods) I am expecting it to have? Eclipse says: Building target: LinkProblem Invoking: GCC C++ Linker g++ -L/home/notroot/workspace/somelib-3/somelib/target/bin -o"LinkProblem" ./src/LinkProblem.o -lsomelib1 -lpthread -lsomelib2 -lsomelib3 ./src/LinkProblem.o: In function `main': /home/notroot/workspace/LinkProblem/Debug/../src/LinkProblem.cpp:17: undefined reference to `SomeClass::close()' ./src/LinkProblem.o: In function `SomeOtherClass': /home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:148: undefined reference to `SomeClass::SomeClass()' /home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:148: undefined reference to `vtable for SomeOtherClass' /home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:151: undefined reference to `SomeClass::~SomeClass()' ./src/LinkProblem.o: In function `~SomeOtherClass': /home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:140: undefined reference to `vtable for SomeOtherClass' /home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:140: undefined reference to `SomeClass::~SomeClass()' /home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:140: undefined reference to `SomeClass::~SomeClass()' collect2: ld returned 1 exit status make: *** [LinkProblem] Error 1 c++ linker g++ eclipse-cdt share|improv here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss http://stackoverflow.com/questions/11968623/linker-error-missing-vtable the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping undefined reference each other. Join them; it only takes a minute: Sign up linker error: missing vtable up vote 0 down vote favorite I'm getting a linker error in xcode and I'm having a hard time understanding and finding the problem. This is the error I'm getting: My Instrument class looks like this: class Instrument { private: public: virtual float undefined reference to getSample(Note ¬e); Instrument(){} }; And it's implemented by my Synth class: class Synth : public Instrument{ private: Volume volume; public: Synth(){} void setVolume(float aVolume); virtual float getSample(Note ¬e); }; And I'm using Instrument as a member in my Track class: class Track { public: bool muted; Instrument instrument; Track(){ this->muted = false; } }; Any ideas what is causing the problem? And I have one more question: If have a Track object, what is the best way to initialize it's instrument member as a Synth? Would this work? Track track; track.instrument = Synth(); c++ objective-c linker-error share|improve this question asked Aug 15 '12 at 11:39 networkprofile 2,4911166126 1 you forgot to mention anything about the implementation of the classes' functions. –SingerOfTheFall Aug 15 '12 at 11:45 add a comment| 1 Answer 1 active oldest votes up vote 5 down vote accepted As Note in error says, you need to provide definition of virtual function which is missing I guess : Instrument::getSample(Note ¬e); but I guess you need pure virtual function, makeUndefined Reference To Vtable Qobject
Undefined Reference To Vtable For Class C++