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#include <iostream>
using namespace std;
 
template<typename T>
using INT_OPERATION = const T(T const, T const);
 
//using func = void(*) (int, int);
 
 
INT_OPERATION<int> add(int const a, int const b)
{
	return a + b;
}
 
int main() 
{
	std::cout << add(1, 2) << std::endl;
	return 0;
}
 
/*const int add(int const a, int const b)
{
	return a + b;
}
*/
 

prog.cpp:10:48: error: ‘add’ declared as function returning a function
 INT_OPERATION<int> add(int const a, int const b)
                                                ^
prog.cpp: In function ‘int main()’:
prog.cpp:17:23: error: ‘add’ was not declared in this scope
  std::cout << add(1, 2) << std::endl;
                       ^

Standard output is empty