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static vector inside a class

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Hi, i want to this: class obj { public: obj(int i){ ID = i; } int ID; static vector<obj*> It; }; And then create objects obj and push all to the vector, some kind of iterator: obj *a = new obj(0); obj *b = new obj(2); obj *c = new obj(1); obj *d = new obj(3); obj::It.push_back(a); All seems to be good, but: error LNK2001: unresolved external symbol "public: static class std::vector<class obj *,class std::allocator<class obj *> > obj::It" (?It@obj@@2V?$vector@PAVobj@@V?$allocator@PAVobj@@@std@@@std@@A) How could it be? Thanks

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You have to declare obj::It outside of the class:

class obj
{
public:
obj(int i)
{
ID = i;
}

int ID;
static vector<obj*> It;
};

// More than likely in the .cpp file.
vector<obj*> obj::It;


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