Question

There is a base class:

template<class T_CLASS>
class TBase
{
  protected:
    static CSomeClass m_objSomeClass;

  public:
    inline void Set(CSomeClass f_objSomeClass) { m_objSomeClass = f_objSomeClass; }
};

And there are some sub classes which all shall have their own static member m_objSomeClass. I try to do this by templating the base class.

class CSub1 : public TBase<CSub1>
{
   //...
};

class CSub2 : public TBase<CSub2>
{
  //...
};

What does the definition for this look like? Is it even possible? I tried some… but none worked:

template<class T_CLASS>
CSomeClass TBase<T_CLASS>::m_objSomeClass;

//In fact the next one worked in Visual Studio; 
// but not in with the armcc where I need it.
CSomeClass TBase<CSub1>::m_objSomeClass;
CSomeClass TBase<CSub2>::m_objSomeClass;

Any suggestions? Thanks, Mirco

Answer 1

template<>
CSomeClass TBase<CSub1>::m_objSomeClass;
template<>
CSomeClass TBase<CSub2>::m_objSomeClass;

is the one of the correct ways, if you want to explicitly have static member defined for a solid class like CSub1, CSub2. Demo.

Edit: The conventional way is to define as:

template<class T_CLASS>
CSomeClass TBase<T_CLASS>::m_objSomeClass;

Both ways would serve the purpose.