static vector<...> in class problem.

This is a discussion on static vector<...> in class problem. within the C++ Programming forums, part of the General Programming Boards category; Okay, I've been struggling around with this for a day, I cannot find the solution. Here is my class declaration: ...

  1. #1
    alkis_y3k
    Guest

    Unhappy static vector<...> in class problem.

    Okay, I've been struggling around with this for a day, I cannot find the solution. Here is my class declaration:

    Code:
    class CRTLight
    {
    public:
        CRTLight() {Lights++; }
        ~CRTLight() {Lights--; } 
    
        void Pu****();    
        static int Lights;
        static vector<CRTLight*> vList;
    
    };
    and my cpp file:
    Code:
    int CRTLight::Lights = 0;
    
    void CRTLight::Pu****()
    {
        vList.push_back(this);
    }
    The compiler (VC++6) complains:
    rLight.obj : error LNK2001: unresolved external symbol "public: static class std::vector<class CRTLight *,class std::allocator<class CRTLight *> > CRTLight::vList" (?vList@CRTLight@@2V?$vector@PAVCRTLight@@V?$alloc ator@PAVCRTLight@@@std@@@std@@A)
    ../bin/rEngine.dll : fatal error LNK1120: 1 unresolved externals

    But if I remove the push_back call, it is ok, but i need the call
    Any ideas?

  2. #2
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    Nevermind, I found it.
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  3. #3
    Registered User newbie_grg's Avatar
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    did you include main function()??i got that sort of unresolved external error when i forgot to include main function
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  4. #4
    pronounced 'fib' FillYourBrain's Avatar
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    funny. You're Push_it() (remove the underscore) got censored.
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  5. #5
    Registered User abrege's Avatar
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    Originally posted by newbie_grg
    did you include main function()??i got that sort of unresolved external error when i forgot to include main function
    I think he included main()
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  6. #6
    Programming Sex-God Polymorphic OOP's Avatar
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    No, the problem was that he didn't do this:

    vector<CRTLight*> CRTLight::vList;

    in the cpp file.

    If it were main that was missing, it would have said the function main, but it said vList, so vList was missing.

    You only get an error if you use it, just like if you used a function without defining it. It's a linking problem, not a compile problem.

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