Unresolved Externals for Template class.

[lucky6969b]

// declaration
template<class T>
class GetValue
{
    void Initialize(std::string fileName);
    
};

// definition
template<class T>
void GetValue<T>::Initialize(std::string fileName)
{
}

// inheritance
class GetD3DXVECTOR3 : public GetValue<D3DXVECTOR3>
{
     
};

I understood that GetValue<D3DXVECTOR3>::Initialize was not defined. How can I reuse the GetValue::Initialize method in every derived classes from GetValue, such as GetD3DXVECTOR3, GetD3DXMATRIX, GetOpenGLVector3 etc
Thanks
Jack