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c++visual-c++-2010

Const procedure in C++, weird error in Visual Studio C++ 2010?

class a{
public:
    int b;
    static int c;
    virtual void mod() const
    {
        c=4;
    }

};



int _tmain(int argc, _TCHAR* argv[])
{
  a bi;

  return 0;
}

Look at this ... After compiling it using Visual Studio C++ 2010 compiler, I get...

cpplearningconsole.obj : error LNK2001: unresolved external symbol "public: static int a::c" (?c@a@@2HA)

I guess this is a compiler bug. For me, the real question is. Should mod be able to modify c variable if it is const?

Thanks.

Solution

  • You have just declared the static variable in the class definition, you need to define it in the by doing int a::c = 0;.