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#include <iostream>
 
using namespace std;
 
 
template <size_t N>
class int_to_type {
	static const int _N = N;
};
 
struct hoge {
	template <int N>
	int operator ()(int_to_type<N>)
	{
		cout << N << endl;
		return 0;
	}
};
 
int main()
{
	// your code goes here
	hoge Hoge;
	Hoge(int_to_type<2>());
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:24:23: error: no match for call to ‘(hoge) (int_to_type<2u>)’
  Hoge(int_to_type<2>());
                       ^
prog.cpp:11:8: note: candidate is:
 struct hoge {
        ^
prog.cpp:13:6: note: template<int N> int hoge::operator()(int_to_type<N>)
  int operator ()(int_to_type<N>)
      ^
prog.cpp:13:6: note:   template argument deduction/substitution failed:
prog.cpp:24:23: note:   mismatched types ‘int’ and ‘#‘integer_cst’ not supported by dump_type#<type error>’
  Hoge(int_to_type<2>());
                       ^
prog.cpp:24:23: note:   ‘int_to_type<2u>’ is not derived from ‘int_to_type<N>’

Standard output is empty