How to write a variadic template recursive function?

Question

I\'m trying to write a variadic template constexpr function which calculates sum of the template parameters given. Here\'s my code:

template<         


        

Answer 1

A more generic solution using std::initializer_list would be:

template                                                                                                                                                                                          
auto sum_all(V... v)
{
  using rettype = typename std::common_type_t;
  rettype result{};
  (void)std::initializer_list{(result += v, 0)...};
  return result;
}