gcc error undefined reference to vtable Ville Platte Louisiana

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gcc error undefined reference to vtable Ville Platte, Louisiana

For example: class Base { virtual void f() = 0; } class Derived : public Base { void f(); } But you haven't given the definition of f. Is there a documented bug filed against gcc? –R.D. All classes are in a same file for a pilot program. #include #include #include using namespace std; #define MAX_IP_RANGE 4294967295 class Interval { public: virtual Interval * interval_copy() share|improve this answer answered Mar 24 '14 at 17:36 sumeet 1 It actually has nothing to do with the constructor or destructor.

I am 99% sure I'm linking to the correct library). I made clean and made my application. The problem was that I declared a virtual destructor in the header file, but the virtual functions' body was actually not implemented. The compiler output is below, including the rather strange linker error.

Why is that ? –Mahesh Oct 11 '11 at 0:37 4 Right, because it is the constructor that needs all the methods to be implemented in order to build the share|improve this answer answered Aug 15 '14 at 14:57 Jerry Miller 44949 add a comment| up vote 0 down vote There are a lot of possibilities mentioned for causing this error, Thanks for sharing! I'm sure you saved me hours of frustration!

Made an error while pasting. For-each library in order: Check unresolved dependencies and see if the lib resolves them. It happens to be the constructor, so I saw my class name and didn't make the connection. Browse other questions tagged c++ gcc g++ or ask your own question.

Otherwise, ensure to define the function." could be added, which in this case would have saved me some productivity. how can you tell if the engine is not brand new? up vote 159 down vote This linker error usually (in my experience) means that you've overridden a virtual function in a child class with a declaration, but haven't given a definition All methods in your classes are both defined in the headers (.h) and the source files (.cpp) 2.

One of these files should have main(). share|improve this answer edited Aug 25 '15 at 18:31 answered Feb 14 '11 at 18:34 Rick Smith 3,83663450 11 +1000 - this exactly solved my problem. –Nathan Osman Jun 2 When you use the class, you get the linker error. Chebyshev Rotation Flow Chart with tikzpicture: particular tipes of arrows Show that a nonabelian group must have at least five distinct elements How should I calculate the determinant?

With the passing of Thai King Bhumibol, are there any customs/etiquette as a traveler I should be aware of? I have a QT4 class: class TestBench : public QMainWindow { Q_OBJECT public: TestBench(QWidget *parent = 0); ~TestBench(); Ui::testBenchForm ui; public slots: void Start(); void Abort(); …. virtual ~CDasherModule(){}; share|improve this answer answered Sep 16 '14 at 20:59 DevByStarlight 746714 add a comment| up vote 2 down vote Are you sure that CDasherComponent has a body for the What happens if one brings more than 10,000 USD with them in the US?

I did not know this, interesting. 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() Comment 6 Jeffrey Yasskin 2010-07-14 03:25:43 UTC FWIW, I've mailed a patch to fix this: http://gcc.gnu.org/PR42540 / http://gcc.gnu.org/ml/gcc- patches/2010-07/msg01116.html It's not perfect, but it does mention the method the user forgot This means a method in IBase is declared as virtual but we forgot to mark it as pure virtual OR provide its definition.

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. share|improve this answer edited May 24 at 21:37 answered Apr 28 at 8:47 Ciro Santilli 烏坎事件2016六四事件 法轮功 52.4k10225166 add a comment| up vote 0 down vote I normally encounter this error What is the first movie to show this hard work message at the very end? Is there a way to confirm that the library has the class (and methods) I am expecting it to have?

I'm trying to do an exercise where I define several implementations of a pure virtual class with a single function. class A { // ... Meaning of "oh freak" Why was the identity of the Half-Blood Prince important to the story? Log in to Reply Rodrigo says: June 25, 2012 at 16:32 This may cause your problem:
class Mesh
virtual void

These causes doesn't seem to be true. I get the error message “undefined reference to `vtable for …” although the .h and .cpp files are synchronized and checked. c++ inheritance vtable share|improve this question edited Feb 23 '12 at 23:49 Lightness Races in Orbit 217k36337583 asked Feb 23 '12 at 3:06 rjmarques 116119 4 You must define every more hot questions default about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science Other

In particular, G++ emits the vtable along with the implementation of the first-declared non-inline function in a class. c++ gcc linker-error share|improve this question edited Mar 1 '13 at 11:35 Peter Wood 11.8k32254 asked Mar 1 '13 at 9:59 Mary Grace Isanan Viaje 3717 marked as duplicate by Luchian Is there a role with more responsibility? Why does argv include the program name?

You need to provide definitions for all virtual functions in class A. share|improve this answer edited Sep 25 '15 at 13:31 Fred Larson 37.7k878110 answered Feb 23 '12 at 3:10 Alok Save 141k24271420 What do you mean? –rjmarques Feb 23 '12 You either have to a) Create an empty body that will be called if no child class reimplements the function b) Create a child class that implements the virtual functions and share|improve this answer answered Sep 30 at 12:52 Yuriy 1 add a comment| up vote -1 down vote I got this error just because the name of a constructor argument differed

Description Sebastian Mach 2010-07-07 06:54:57 UTC I previously entered this to gcc-bugs: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44841 : "It was today that I stumbled over the seemingly simple situation of tweaking some bits of an 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), This file was compiled, but not linked, so the linker was complaining about being unable to find it. You could be on to something though.

But if I link the application like this: gcc -o plop plop.o -l2 -l1 Then it will link correctly. permissions on /etc/shadow Karger's Algorithm question Are there any rules or guidelines about designing a flag?