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#include <iostream>
#include <typeinfo>
 
class Base {
public:
	typedef Base Type;
//	using T2 = Base;
//	typedef decltype(*this) H;
	Base() {}
};
 
class Next :public Base{
public:
	typedef Next Type;
//	using T2 = Next;
//	typedef decltype(*this) H;
	Next() {}
};
 
template<class T>
class TGetter {
public:
	typedef T Ty;
 
};
 
int main()
{
	Next N;
	Base *p = &N;
	//using T = decltype(p);
	//typename (*T)::T X;
	TGetter<decltype(*p)>::Ty::Type T();
	std::cout << typeid(T).name() << std::endl;//need Next!
 
 
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:33:34: error: qualified-id in declaration before ‘T’
  TGetter<decltype(*p)>::Ty::Type T();
                                  ^
prog.cpp:34:22: error: ‘T’ was not declared in this scope
  std::cout << typeid(T).name() << std::endl;//need Next!
                      ^

Standard output is empty