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#include <cstddef>
#include <iostream>
 
template <typename Derived>
struct B
{
	typedef typename Derived::Type Type2;
 
	Type2 operator[] (const std::size_t i) { return Derived::_kernel[i]; }
 
    static const std::size_t _size = sizeof(Derived::_kernel) / sizeof(Type2);
};
 
template <typename T>
struct D : public B< D<T> >
{
    typedef T Type;
    static const T _kernel[];
};
 
template <typename T>
const T D<T>::_kernel[] = {T(1.0)};
 
int main()
{
	D<float> d;
    std::cout << D<float>::_size << std::endl;
	return 0;
}

prog.cpp: In instantiation of 'struct B<D<float> >':
prog.cpp:15:8:   required from 'struct D<float>'
prog.cpp:26:11:   required from here
prog.cpp:7:33: error: no type named 'Type' in 'struct D<float>'
  typedef typename Derived::Type Type2;
                                 ^

Standard output is empty