C++ template div integer to even and odd.

template_even_odd.cpp

#include <iostream>

template <int I>
void div( char(*)[I % 2 == 0] = 0 ) {
  std::cout << "even!!!" << std::endl;  
}

template <int I>
void div( char(*)[I % 2 == 1] = 0 ) {
  std::cout << "odd!!!" << std::endl;
}

int main() {
  div<5>();
  div<6>();
  
  return 0;
}