class Function
    {
        typedef void (*FUNCTION)();

    public:
        FUNCTION function() const;
    
    private:
        FUNCTION _function;
    }

    Function::FUNCTION Function::function() const
    {
        return _function;
    }

    template<class T>
    class Function
    {
        typedef void (*FUNCTION)(T *);

    public:
        FUNCTION function() const;
    
    private:
        FUNCTION _function;
    }

    template<class T>
    Function::FUNCTION Function<T>::function() const // neither if I use Function<T>::FUNCTION ...
    {
        return _function;
    }

    template<class T>    class Function    {        typedef void (*FUNCTION)(T *);    public:        const FUNCTION &function() const;        private:        FUNCTION _function;    }    template<class T>    const Function<T>::FUNCTION &Function<T>::function() const    {        return _function;    }