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#include <iostream>
using namespace std;
 
template <class C,typename T, T C::*v>
struct getPointerType {
   typedef T type;
};
 
class Test {
	int value;
};
 
int main() {
	int Test::*member=nullptr;
	cout << typeid(getPointerType<Test, int, decltype(member)>::type) << std::endl;
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:15:59: error: type/value mismatch at argument 3 in template parameter list for ‘template<class C, class T, T C::* v> struct getPointerType’
  cout << typeid(getPointerType<Test, int, decltype(member)>::type) << std::endl;
                                                           ^
prog.cpp:15:59: error:   expected a constant of type ‘T C::*’, got ‘int Test::*’

Standard output is empty