Re: static data members in template class problem

Hi,
Following code gives a linker error:

test.obj : error LNK2001: unresolved external symbol "public: static int
const BresenhamCircle<2>::SIZE"

template <int R>
class BresenhamCircle
{
public:
    static const int SIZE;
};

template <int R>
class Test
{
    BresenhamCircle<R> circle;
public:
    int testfunction();//[1] { return circle.SIZE+1000*R; }

};

template<int R>
int Test<R>::testfunction()
{
    return circle.SIZE+1000*R;

}

template<int R> const int BresenhamCircle<R>::SIZE = -1;
                const int BresenhamCircle<4>::SIZE = 4;

#include <iostream>
int main()
{
    Test<2> obj;
    //[2] Test<4> obj;
    std::cout<<obj.testfunction()<<std::endl;
}

And two interesting things happen:
[1] - code compiles and links without errors when we make the
testfunction() inline.
[2] - all is ok for specialized versions;

I'm learning c++, and I have no idea if I'm wrong, or the compiler has a
bug, but I suppose the latter since gcc(3.3.6) compiles this code just
fine (or maybe it is UB?). I do not understand why the behaviour is
different for inline and non-inline functions.